Neuroscience Chapter Quiz
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Questions and Answers

What primarily consists of nerve cell bodies and neuroglia?

  • Choroid plexus
  • Ependyma
  • White matter
  • Grey matter (correct)

    • Which structure connects the left and right hemispheres of the brain?

  • Cerebral aqueduct
  • Corpus callosum (correct)
  • Interventricular canal
  • Choroid plexus

    • What type of fluid is found in the ventricles of the brain?

  • Lymphatic fluid
  • Interstitial fluid
  • Blood
  • Cerebrospinal fluid (CSF) (correct)

    • How much cerebrospinal fluid (CSF) is produced daily?

    <p>500 ml</p> Signup and view all the answers

    Which part of the brain is located between the cerebellum and the brainstem?

    <p>Fourth ventricle</p> Signup and view all the answers

    What are supportive cells in the nervous system called?

    <p>Neuroglia</p> Signup and view all the answers

    Which of the following ventricles is located between the thalamic walls?

    <p>Third ventricle</p> Signup and view all the answers

    What lines the ventricles of the brain?

    <p>Ependyma</p> Signup and view all the answers

    What occurs when the posterior part of the anulus fibrosus ruptures?

    <p>The nucleus pulposus is pushed out.</p> Signup and view all the answers

    What is referred pain along the distribution of the sciatic nerve known as?

    <p>Sciatica</p> Signup and view all the answers

    What is the main function of dermatomes in the nervous system?

    <p>They provide sensation to specific skin areas.</p> Signup and view all the answers

    Which reflex type involves multiple synapses?

    <p>Polysynaptic reflex</p> Signup and view all the answers

    Which stage is NOT part of the typical reflex arc?

    <p>Cognitive processing</p> Signup and view all the answers

    What type of cells produce myelin in the central nervous system?

    <p>Oligodendrocytes</p> Signup and view all the answers

    Which type of neuroglia provides nutritional support in the peripheral nervous system?

    <p>Satellites cells</p> Signup and view all the answers

    What is the primary role of microglia in the CNS?

    <p>Remove damaged neurons and infections</p> Signup and view all the answers

    Which part of the brain is responsible for producing cerebrospinal fluid?

    <p>Ependymal cells</p> Signup and view all the answers

    Which of the following neuroglial cells is responsible for insulating synapses and absorbing neurotransmitters?

    <p>Astrocytes</p> Signup and view all the answers

    What are the two major divisions of the nervous system based on structure?

    <p>CNS and PNS</p> Signup and view all the answers

    Which of the following is NOT a component of the central nervous system?

    <p>Cranial nerves</p> Signup and view all the answers

    Which structure connects the two hemispheres of the cerebrum?

    <p>Corpus callosum</p> Signup and view all the answers

    How many pairs of spinal nerves are present in the peripheral nervous system?

    <p>31</p> Signup and view all the answers

    What are the surfaces of the cerebrum characterized by?

    <p>Gyri, sulci, and fissures</p> Signup and view all the answers

    Where is cerebrospinal fluid (CSF) primarily produced?

    <p>Choroid plexus</p> Signup and view all the answers

    What is the pathway of CSF flow after it is produced in the lateral ventricles?

    <p>Lateral ventricle → Third ventricle → Fourth ventricle</p> Signup and view all the answers

    Which foramina allow CSF to exit the fourth ventricle into the subarachnoid space?

    <p>Lateral aperture of Luschka and Median aperture of Magendie</p> Signup and view all the answers

    How does CSF get reabsorbed into the venous circulation?

    <p>Via arachnoid granulations</p> Signup and view all the answers

    What structures protect the brain and spinal cord?

    <p>Meninges and cerebrospinal fluid</p> Signup and view all the answers

    Which layer is NOT part of the meninges?

    <p>Epidermal layer</p> Signup and view all the answers

    What is the primary role of cerebrospinal fluid (CSF)?

    <p>To cushion the brain and spinal cord</p> Signup and view all the answers

    What is the anatomical term for the canal that connects the lateral and third ventricles?

    <p>Interventricular foramen</p> Signup and view all the answers

    What is the primary function of the dura mater?

    <p>To enclose the brain and spinal cord</p> Signup and view all the answers

    Where does the meningeal dural layer extend from and to?

    <p>From the foramen magnum to S2</p> Signup and view all the answers

    What do dural partitions do within the cranial cavity?

    <p>Partially subdivide the cranial cavity</p> Signup and view all the answers

    What is the role of arachnoid granulations?

    <p>To permit one-way flow of CSF to the bloodstream</p> Signup and view all the answers

    Which layer of the meninges is firmly attached to the brain?

    <p>Pia mater</p> Signup and view all the answers

    What is a characteristic of the arachnoid mater?

    <p>It is a delicate, non-vascular connective tissue layer</p> Signup and view all the answers

    What separates the arachnoid mater from the dura mater?

    <p>Subdural space</p> Signup and view all the answers

    What is the nature of the outer dural layer?

    <p>It is loosely attached to the vault of the skull</p> Signup and view all the answers

    What layer of the meninges is closely invested in the surface of the brain?

    <p>Pia mater</p> Signup and view all the answers

    Which of the following materials is found in the subarachnoid space?

    <p>Cerebrospinal fluid (CSF)</p> Signup and view all the answers

    What is the function of the arachnoid granulations?

    <p>To reabsorb cerebrospinal fluid</p> Signup and view all the answers

    At which vertebral level does the spinal cord typically end in adults?

    <p>L1/L2</p> Signup and view all the answers

    What is the primary composition of the core of the spinal cord?

    <p>Grey matter surrounded by white matter</p> Signup and view all the answers

    Which type of neuron has a cell body with a single neurite that divides shortly after leaving the body?

    <p>Unipolar neurons</p> Signup and view all the answers

    What is the primary function of dendrites in a neuron?

    <p>Receive information for the cell</p> Signup and view all the answers

    Which type of neuron is primarily found in the retina and provides the pathway for visual signals?

    <p>Bipolar neurons</p> Signup and view all the answers

    What is contained within the cytoplasm of a neuron?

    <p>Nucleus and various organelles</p> Signup and view all the answers

    What is the primary role of the dura mater?

    <p>To enclose the brain and spinal cord</p> Signup and view all the answers

    Which component of the peripheral nervous system is primarily responsible for transmitting impulses away from the neuron?

    <p>Axons</p> Signup and view all the answers

    What structural feature distinguishes multipolar neurons from other types of neurons?

    <p>Numerous processes involving many dendrites</p> Signup and view all the answers

    Where does the meningeal dural layer extend from and to?

    <p>From the foramen magnum to S2</p> Signup and view all the answers

    What do dural partitions primarily do within the cranial cavity?

    <p>Separate and subdivide the cranial cavity</p> Signup and view all the answers

    Which of the following correctly describes the role of neurons in the nervous system?

    <p>Serve as the basic working units by conducting impulses</p> Signup and view all the answers

    What structure allows for the one-way flow of cerebrospinal fluid to the bloodstream?

    <p>Arachnoid granulations</p> Signup and view all the answers

    Which type of nerve cell is characterized by having numerous processes but a single long axon?

    <p>Multipolar neurons</p> Signup and view all the answers

    Which layer of the meninges is described as delicate and spidery?

    <p>Arachnoid mater</p> Signup and view all the answers

    What separates the arachnoid mater from the dura mater?

    <p>Subdural space</p> Signup and view all the answers

    What is found at the junction of the outer dural layer and the skull?

    <p>Periosteum</p> Signup and view all the answers

    What are dural sinuses primarily associated with?

    <p>Circulation of blood</p> Signup and view all the answers

    What is the primary function of astrocytes in the central nervous system?

    <p>Provide structural support and regulate neurotransmitter levels.</p> Signup and view all the answers

    Which type of neuroglia is responsible for producing myelin in the peripheral nervous system?

    <p>Schwann cells</p> Signup and view all the answers

    What role do microglia play in the central nervous system?

    <p>Act as specialized macrophages to remove damaged neurons.</p> Signup and view all the answers

    How are the cerebral hemispheres connected?

    <p>Through the corpus callosum.</p> Signup and view all the answers

    Which structure is responsible for the production of cerebrospinal fluid?

    <p>Ependymal cells in the choroid plexus</p> Signup and view all the answers

    Which of the following is a characteristic of the cerebrum's surface?

    <p>It contains gyri and sulci.</p> Signup and view all the answers

    What are the primary types of neuroglia found in the central nervous system?

    <p>Astrocytes and oligodendrocytes</p> Signup and view all the answers

    What is one of the primary functions of satellite cells in the peripheral nervous system?

    <p>Help regulate ion concentration and provide support.</p> Signup and view all the answers

    Which part of the nervous system is primarily responsible for the autonomic functions?

    <p>Visceral nervous system</p> Signup and view all the answers

    Which of the following structures is NOT part of the central nervous system?

    <p>Cranial nerves</p> Signup and view all the answers

    What is the primary function of the sympathetic nervous system?

    <p>Increase heart rate and prepare the body for action</p> Signup and view all the answers

    Where do the fibers of the sympathetic nervous system originate?

    <p>Thoracolumbar regions of the spinal cord</p> Signup and view all the answers

    Which of the following describes a key characteristic of the parasympathetic nervous system?

    <p>Stimulates 'rest and digest' functions</p> Signup and view all the answers

    Which cranial nerves are involved in the parasympathetic nervous system?

    <p>CNIII, CNVII, CNIX, CNX</p> Signup and view all the answers

    What is one of the primary roles of the sympathetic system during a 'fight or flight' response?

    <p>Increase heart rate and contractility</p> Signup and view all the answers

    What differentiates the sympathetic nervous system and the parasympathetic nervous system in terms of location of pre-synaptic cell bodies?

    <p>Sympathetic is thoracolumbar, Parasympathetic is cranio-sacral</p> Signup and view all the answers

    What happens to the gastrointestinal function during sympathetic activation?

    <p>Decrease in metabolic processes associated with digestion</p> Signup and view all the answers

    In the autonomic nervous system, what is the main distinction between the sympathetic and parasympathetic systems?

    <p>Location of the post-synaptic cell bodies</p> Signup and view all the answers

    What typically happens when the nucleus pulposus is pushed out during a herniated intervertebral disc?

    <p>It leads to dermatomal pain and muscle weakness.</p> Signup and view all the answers

    In the context of spinal cord injury, what is a common consequence of damage to the emerging spinal nerves?

    <p>Absent reflexes in affected areas.</p> Signup and view all the answers

    Which best describes the relationship between dermatomes and spinal nerves?

    <p>Dermatomes specifically map strips of skin to individual spinal nerves.</p> Signup and view all the answers

    Which of the following accurately describes a reflex arc's integration centre?

    <p>It acts as a relay point for processing stimulus responses.</p> Signup and view all the answers

    What kind of nerve supply is primarily involved in the referral of pain along the sciatic nerve in lumbar disc herniation?

    <p>Peripheral spiinal nerve supply to lower limbs.</p> Signup and view all the answers

    What is the primary composition of the grey matter in the brain?

    <p>Nerve cell bodies and neuroglia</p> Signup and view all the answers

    Which of the following structures contributes to the formation of cerebrospinal fluid in the lateral ventricles?

    <p>Choroid plexus</p> Signup and view all the answers

    What is the role of ependymal cells in the ventricles?

    <p>Lining the ventricles</p> Signup and view all the answers

    Which cavity is located between the cerebellum and brainstem?

    <p>Fourth ventricle</p> Signup and view all the answers

    How does cerebrospinal fluid flow from the third ventricle to the fourth ventricle?

    <p>Through the cerebral aqueduct</p> Signup and view all the answers

    Which of the following best describes white matter in the brain?

    <p>Myelinated nerve fibers and neuroglia</p> Signup and view all the answers

    What structure serves as a connection between the left and right thalamic walls?

    <p>Corpus callosum</p> Signup and view all the answers

    What is the function of the arachnoid granulations in the central nervous system?

    <p>Absorbing excess cerebrospinal fluid into the venous circulation</p> Signup and view all the answers

    What are the dural partitions responsible for within the cranial cavity?

    <p>They subdivide the cranial cavity.</p> Signup and view all the answers

    What is the main characteristic of the arachnoid mater?

    <p>It is delicate and non-vascular.</p> Signup and view all the answers

    Which structure allows for the one-way flow of cerebrospinal fluid to the bloodstream?

    <p>Arachnoid granulations</p> Signup and view all the answers

    At which vertebral level does the meningeal dural layer end?

    <p>S2</p> Signup and view all the answers

    What layer of the dura mater is loosely attached to the skull's vault?

    <p>Endocranium</p> Signup and view all the answers

    What is the primary role of the pia mater?

    <p>To firmly attach to the brain's surface</p> Signup and view all the answers

    What type of tissue is primarily found in the arachnoid mater?

    <p>Connective tissue</p> Signup and view all the answers

    Which layer separates the arachnoid mater from the dura mater?

    <p>Subdural space</p> Signup and view all the answers

    What distinguishes a unipolar neuron from other types of neurons?

    <p>It consists of a single neurite that divides close to the cell body.</p> Signup and view all the answers

    Which of the following best describes the function of axons in neurons?

    <p>They transmit nerve impulses away from the cell body.</p> Signup and view all the answers

    In which part of the nervous system are bipolar neurons primarily found?

    <p>Retina and sensory ganglia</p> Signup and view all the answers

    What is the primary structural feature of multipolar neurons?

    <p>They possess multiple processes that include many dendrites.</p> Signup and view all the answers

    Which type of neuron is often referred to as 'pseudounipolar'?

    <p>Unipolar neurons</p> Signup and view all the answers

    What is the basic working unit of the nervous system that transmits information?

    <p>Neurons</p> Signup and view all the answers

    What is the role of dendrites within a neuron?

    <p>To receive signals and convey them towards the cell body.</p> Signup and view all the answers

    Which of the following examples represents a multipolar neuron?

    <p>Motor neurons in the spinal cord</p> Signup and view all the answers

    Which cranial nerves contain presynaptic parasympathetic nerve cell bodies located in the gray matter of the brainstem?

    <p>CN III, CN VII, CN IX, CN X</p> Signup and view all the answers

    What is the primary role of sensory ganglia in the peripheral nervous system?

    <p>To relay sensory information from peripheral receptors to the central nervous system</p> Signup and view all the answers

    Which of the following accurately describes visceral sensation?

    <p>Typically imperceptible and vague, arising from internal organs</p> Signup and view all the answers

    Which type of motor impulse is responsible for voluntary control over skeletal muscle?

    <p>Voluntary motor impulse</p> Signup and view all the answers

    What is the anatomical relationship between anterior (ventral) and posterior (dorsal) roots of spinal nerves?

    <p>They unite to form the spinal nerve, with sensory and motor functions</p> Signup and view all the answers

    In which specific regions of the spinal cord can lateral horns be found?

    <p>T1-L2 and S2-S4 segments</p> Signup and view all the answers

    Where are pre-aortic ganglia typically located?

    <p>Around the main abdominal arteries</p> Signup and view all the answers

    What characterizes sensory (afferent) impulses in terms of direction?

    <p>They move towards the CNS from peripheral sensory receptors</p> Signup and view all the answers

    Study Notes

    Nervous System Cell Types

    • Neurons: Specialized cells for receiving stimuli and conducting nerve impulses. They are found in the brain, spinal cord, and ganglia.
      • Cell body (soma): Contains the nucleus and other organelles.
      • Dendrites: Receive information and conduct it towards the cell body.
      • Axons: Conduct impulses away from the cell body.
    • Neuroglia: Non-excitable cells providing structural support and producing myelin.
      • Central Nervous System (CNS):
        • Astrocytes: Provide structural support, insulate synapses, and regulate neurotransmitters.
        • Oligodendrocytes: Produce myelin in the CNS.
        • Microglia: Act as macrophages, removing damaged neurons and infections.
        • Ependymal cells: Line ventricles in the brain and the central canal of the spinal cord. They produce cerebrospinal fluid (CSF).
      • Peripheral Nervous System (PNS):
        • Schwann cells: Produce myelin in the PNS.
        • Satellite cells: Provide nutritional support and regulate ion concentration.

    Neuron Types

    • Unipolar neurons: Have a single neurite that divides a short distance from the cell body. Examples include dorsal root ganglion neurons.
    • Bipolar neurons: Elongated cell body with an axon at one end and a dendrite at the other. Examples include retinal bipolar cells and sensory cochlear and vestibular ganglia neurons.
    • Multipolar neurons: Have numerous processes arising from the cell body. Most neurons in the brain and spinal cord, including motor neurons, are multipolar.

    Synapses

    • The point of communication between two neurons is called a synapse.
    • Pre-synaptic neuron: Conducts the impulse toward the synapse.
    • Post-synaptic neuron: Receives the impulse from the synapse.

    Nervous System Organization

    • Functionally:
      • Somatic nervous system: Controls voluntary movements.
      • Visceral (Autonomic nervous system): Controls involuntary functions.
    • Structurally:
      • Central Nervous System (CNS):
        • Brain: Located within the skull.
        • Spinal cord: Located within the vertebral canal.
      • Peripheral Nervous System (PNS):
        • Cranial nerves: Nerves originating from the brain.
        • Spinal nerves: Nerves originating from the spinal cord.

    CNS Divisions

    • Brain:
      • Cerebrum (Telencephalon): Responsible for higher cognitive functions.
      • Diencephalon: Relays sensory information and controls autonomic functions.
      • Brain stem: Connects the cerebrum and cerebellum to the spinal cord.
        • Midbrain (Mesencephalon): Involved in motor control, vision, hearing, and sleep-wake cycles.
        • Pons (Metencephalon): Relays information between the cerebrum and cerebellum.
        • Medulla oblongata (Myelencephalon): Controls vital functions like breathing, heart rate, and blood pressure.
      • Cerebellum (Metencephalon): Coordinates movement and balance.
    • Spinal cord: Conducts signals between the brain and the rest of the body.

    PNS Divisions

    • 31 pairs of spinal nerves: Originate from segments of the spinal cord.
    • 12 pairs of cranial nerves: Originate from the brain.

    Cerebrum

    • Surface: Characterized by gyri (elevations), sulci (depressions), and fissures (deep depressions).
    • Lobes: Five lobes: frontal, parietal, temporal, occipital, and insular.
    • Hemispheres: Two (left and right) connected by the corpus callosum.

    Meninges

    • Dura mater: The tough outer layer.
      • Outer endosteal layer: Attached to the skull.
      • Inner meningeal layer: Separates from the endosteal layer to form dural partitions.
    • Arachnoid mater: Delicate, spidery layer between dura mater and pia mater.
    • Pia mater: Inner layer firmly attached to the brain.

    Dural Partitions

    • Falx cerebri: Separates the two cerebral hemispheres.
    • Falx cerebeli: Separates the two cerebellar hemispheres.
    • Dural sinuses: Intracranial venous structures.

    Arachnoid mater

    • Subdural space: Space between dura mater and arachnoid mater.
    • Arachnoid granulations/villi: Projections of arachnoid mater that permit one-way flow of CSF from the subarachnoid space to the bloodstream.

    Pia mater

    • Subarachnoid space: Space between arachnoid mater and pia mater, containing CSF.

    Spinal Cord

    • Location: Extends from the foramen magnum to approximately the level of the disc between vertebrae L1/L2 in adults (L3 in neonates).
    • Meninges: Covered by the same three meningeal layers as the brain.
    • Swellings: Cervical (C5-T1) and lumbosacral (L1-S3).
    • Structure:
      • Gray matter: Core of the spinal cord, containing neuron cell bodies.
      • White matter: Surrounds the gray matter, containing myelinated axons.

    Lumbar puncture

    • Also known as a spinal tap.
    • A needle is inserted into the subarachnoid space to collect CSF for diagnostic purposes.
    • It can also be used to inject drugs or induce anesthesia.

    Autonomic Nervous System

    • Visceral motor system: Controls involuntary functions.
    • Sympathetic nervous system:
      • "Fight or flight" response.
      • Increases heart rate and contractility, blood pressure, and blood flow to muscles.
      • Dilates pupils and bronchioles.
      • Derived from cells in the lateral horn of the spinal cord (T1-L2).
    • Parasympathetic nervous system:
      • "Rest and digest" response.
      • Decreases heart rate, increases intestinal and glandular activity, and relaxes sphincter muscles.
      • Constricts pupils and bronchioles.
      • Derived from the cranial nerves (CNIII, CNVII, CNIX, CNX) and the sacral spinal cord (S2-4).

    Autonomic Nervous System Structure

    • Pre-ganglionic neuron: The first neuron in the pathway, whose cell body is located in the CNS.
    • Post-ganglionic neuron: The second neuron in the pathway, whose cell body is located in a ganglion.

    Sympathetic Nervous System

    • Origin: Fibers originate in the thoracolumbar region of the spinal cord (intermedio-lateral cell column of T1-L2).

    Parasympathetic Nervous System

    • Origin: Fibers originate in the brain stem (cranial nerves) and the sacral spinal cord (S2-4).

    Nervous System Overview

    • The nervous system is responsible for receiving, processing, and transmitting information throughout the body.
    • It coordinates bodily functions and enables us to interact with the environment.

    Neuron Types

    • Neurons are the basic functional unit of the nervous system.
    • Unipolar neurons have a single neurite that divides, one proceeding to a peripheral structure and the other to the CNS.
    • Bipolar neurons have an elongated cell body with an axon at one end and a dendrite at the other.
    • Multipolar neurons have numerous processes arising from the cell body, with one long process being the axon and the rest dendrites.

    Central Nervous System

    • Grey matter consists of nerve cell bodies and neuroglia. It's found in the cortex and scattered in the core (basal ganglia).
    • White matter consists of nerve fibers and neuroglia. It's located in the central/inner matter.

    Ventricles

    • The brain contains ventricles, CSF-filled cavities.
    • There are two lateral, one third, and one fourth ventricle.
    • Cerebrospinal fluid (CSF) is produced at a rate of 500ml/day.
    • The choroid plexus in the ventricles produces CSF.

    Meninges

    • The meninges are three layers of protective membranes that surround the brain and spinal cord.
    • Dura mater is the tough outer layer, with an outer endosteal layer and an inner meningeal layer.
    • Arachnoid mater is a delicate, spider-like layer between the dura mater and pia mater.
    • Pia mater is the inner layer, firmly attached to the brain.

    Dural Partitions

    • The meningeal dural layer encloses the brain and spinal cord, extending from the foramen magnum to S2.
    • Dural partitions, such as falx cerebri and falx cerebeli, subdivide the cranial cavity.
    • Dural sinuses are intracranial venous structures that drain blood from the brain.

    Arachnoid Mater

    • The arachnoid mater is delicate, non-vascular, and separated from the dura mater by the subdural space.
    • Arachnoid granulations are finger-like projections that allow CSF flow to the bloodstream.

    Spinal Nerve Injury

    • Disc herniations, fractures of vertebral bodies, and osteoarthritis can cause pressure, stretching, or edema of the emerging spinal nerves.
    • This can lead to dermatomal pain, muscle weakness, and diminished or absent reflexes.

    Reflexes

    • Reflexes are automatic, involuntary responses to a stimulus.
    • Monosynaptic reflexes involve a single synapse, like the knee-jerk reflex.
    • Polysynaptic reflexes involve multiple synapses.
    • Ganglia are clusters of nerve cell bodies outside the CNS.

    Parasympathetic Nervous System

    • Presynaptic parasympathetic nerve cell bodies are found in the gray matter of the brainstem (CN III, VII, IX, X) and sacral segments of the spinal cord (S2-S4).

    Important Definitions

    • Afferent nerve impulses travel towards the CNS (sensory).
    • Efferent nerve impulses travel away from the CNS (motor).
    • Somatic sensation is well-localized and arises from body wall structures.
    • Visceral sensation is often poorly localized or only perceived in disease, arising from blood vessels and internal organs.
    • Voluntary motor control governs skeletal muscles.
    • Autonomic (involuntary) motor control governs muscles over which we have no conscious control.

    Spinal Cord Features

    • The spinal cord has an H-shaped grey matter, surrounded by white matter.
    • The dorsal horn receives sensory input.
    • The ventral horn contains motor neurons.
    • The lateral horn is present in the thoracic and sacral regions.

    Ganglia Types

    • Sensory ganglia are found along the dorsal roots of spinal nerves and cranial nerves V, VII, VIII, IX, and X.
    • Autonomic ganglia are found in the paravertebral sympathetic chains, around great arteries, and in the walls of viscera.

    Spinal Nerve Formation

    • The anterior (ventral/motor) root and posterior (dorsal/sensory) root unite to form the spinal nerve.

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