CNS/PNS Quiz
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Questions and Answers

What is the primary role of the brain and spinal cord in the nervous system?

  • To send sensory impulses exclusively to the limbs
  • To carry impulses from the brain to the heart
  • To regulate only motor functions
  • To interpret sensory information and issue instructions (correct)
  • Which of the following statements best describes the afferent division of the peripheral nervous system?

  • It conveys impulses away from the brain
  • It exclusively involves cranial nerves
  • It only processes motor commands
  • It conducts impulses toward the spinal cord and brain (correct)
  • What is the main function of the somatic system?

  • To regulate internal organs and blood pressure
  • To manage unconscious bodily functions
  • To determine the organism's relationship to the outside world (correct)
  • To control glandular activity
  • What distinguishes the visceral system from the somatic system?

    <p>The visceral system relates to internal viscera. (B)</p> Signup and view all the answers

    Which component of the nervous system is referred to as the autonomic nervous system?

    <p>The motor component of the visceral peripheral nervous system (A)</p> Signup and view all the answers

    Which type of neuron carries impulses from sensory receptors to the central nervous system?

    <p>Afferent or sensory neuron (D)</p> Signup and view all the answers

    How are the sympathetic and parasympathetic nervous systems related?

    <p>They innervate most organs and often work antagonistically. (D)</p> Signup and view all the answers

    What type of muscle does the efferent or motor neuron primarily act upon?

    <p>Skeletal muscle (D)</p> Signup and view all the answers

    What is the primary function of the somatic nervous system?

    <p>Regulates voluntary movement of the body (C)</p> Signup and view all the answers

    Which cranial nerves are associated with the parasympathetic division of the autonomic nervous system?

    <p>III, VII, IX, X (D)</p> Signup and view all the answers

    What do the sympathetic and parasympathetic divisions predominantly regulate in the body?

    <p>Bodily functions such as heart rate and urination (B)</p> Signup and view all the answers

    Where do visceral efferent fibers of the sympathetic division exit the central nervous system?

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

    Which of the following correctly contrasts the autonomic and somatic nervous systems?

    <p>Somatic regulates voluntary movements; autonomic regulates involuntary movements. (A)</p> Signup and view all the answers

    What best describes the relationship between the sympathetic and parasympathetic divisions?

    <p>They have cooperative roles that balance each other. (A)</p> Signup and view all the answers

    What type of fibers join with other nerves to travel to their target organs in the autonomic system?

    <p>Visceral efferent fibers (C)</p> Signup and view all the answers

    What is a primary characteristic of the autonomic nervous system?

    <p>Regulates involuntary bodily functions. (D)</p> Signup and view all the answers

    What is the primary function of somatic reflexes?

    <p>Stimulate skeletal muscles (D)</p> Signup and view all the answers

    Which of the following elements is NOT a part of the reflex arc?

    <p>Interneuron (B)</p> Signup and view all the answers

    When a person pulls their hand away from a hot object, this action is an example of which type of reflex?

    <p>Somatic reflex (A)</p> Signup and view all the answers

    Which nerves are described as mixed nerves?

    <p>Spinal nerves that contain both sensory and motor fibers (B)</p> Signup and view all the answers

    Which of the following statements is true regarding cranial nerves?

    <p>Some cranial nerves are purely sensory. (A)</p> Signup and view all the answers

    How do autonomic reflexes differ from somatic reflexes?

    <p>Autonomic reflexes regulate glands and smooth muscles. (D)</p> Signup and view all the answers

    What does the term 'afferent' refer to in the context of nerve impulses?

    <p>Nerves that carry sensory signals to the central nervous system (B)</p> Signup and view all the answers

    Which part of the nervous system is primarily involved in the integration center of a reflex arc?

    <p>Central nervous system (C)</p> Signup and view all the answers

    Which side of the brain controls the right side of the body?

    <p>Left side of the brain (D)</p> Signup and view all the answers

    What is the primary function of the nervous system?

    <p>To integrate and respond to the environment (C)</p> Signup and view all the answers

    What is the process of interpreting sensory input called?

    <p>Integration (A)</p> Signup and view all the answers

    Which component is NOT a function of the nervous system?

    <p>Endocrine (C)</p> Signup and view all the answers

    How does the nervous system gather information from the environment?

    <p>Via sensory receptors (D)</p> Signup and view all the answers

    What are effectors in the context of the nervous system?

    <p>Muscles and glands responding to signals (C)</p> Signup and view all the answers

    What happens after the nervous system detects changes in the environment?

    <p>It interprets the information and produces a behavioral response. (D)</p> Signup and view all the answers

    Which of the following is a correct sequence of action for the nervous system?

    <p>Sensory Input → Integration → Response (D)</p> Signup and view all the answers

    What is the main function of the thin branching extensions of the cell body?

    <p>Conduct nerve impulses toward the cell body (A)</p> Signup and view all the answers

    What is the role of a single branch in most neurons?

    <p>To conduct nerve impulses away from the cell body (B)</p> Signup and view all the answers

    What anatomical feature is described as being shorter than the vertebral canal?

    <p>The spinal cord (D)</p> Signup and view all the answers

    What is the term used to describe the enlarged areas of the spinal cord?

    <p>Cervical and lumbar intumescence (B)</p> Signup and view all the answers

    Which of the following structures is not part of the spinal cord anatomy described?

    <p>Coronal bones (B)</p> Signup and view all the answers

    In the context of the spinal cord, what is identified as the 'cauda equina'?

    <p>The network of spinal nerves beyond the lumbar intumescence (C)</p> Signup and view all the answers

    What is primarily conducted by the thin branching extensions from neurons?

    <p>Nerve impulses (D)</p> Signup and view all the answers

    Which is a characteristic feature of the spinal cord based on the provided information?

    <p>It has distinct enlargement areas (A)</p> Signup and view all the answers

    Which type of nerve carries impulses towards the central nervous system?

    <p>Sensory nerves (B)</p> Signup and view all the answers

    What type of nerve is always classified as a mixed nerve?

    <p>Spinal nerves (B)</p> Signup and view all the answers

    Which of the following cranial nerves is primarily responsible for vision?

    <p>Optic (II) (A)</p> Signup and view all the answers

    What part of the brain acts as a relay center, filtering sensory input?

    <p>Brainstem (B)</p> Signup and view all the answers

    Which of the following cranial nerves is not a mixed nerve?

    <p>Olfactory (I) (A)</p> Signup and view all the answers

    Which structure of the brain is primarily involved in the coordination and fine-tuning of movement?

    <p>Cerebellum (A)</p> Signup and view all the answers

    Which nervous structure emerges from the spinal cord?

    <p>Spinal nerves (D)</p> Signup and view all the answers

    The majority of cranial nerves serve which function?

    <p>Generally a mix of sensory and motor functions (D)</p> Signup and view all the answers

    Which cranial nerve is responsible for the sense of hearing?

    <p>Vestibulocochlear (VIII) (D)</p> Signup and view all the answers

    What is the primary role of the cerebrum in the context of movement?

    <p>To initiate movement (C)</p> Signup and view all the answers

    Which cranial nerve is responsible for both motor and sensory functions related to taste, swallowing, and salivation?

    <p>Glossopharyngeal (CN IX) (D)</p> Signup and view all the answers

    Which cranial nerve is primarily responsible for controlling eye movements, specifically the ability to look downwards and inwards?

    <p>Trochlear (CN IV) (D)</p> Signup and view all the answers

    Which of the following cranial nerves is solely responsible for sensory functions related to hearing and balance?

    <p>Vestibulocochlear (CN VIII) (A)</p> Signup and view all the answers

    Which cranial nerve is involved in controlling the muscles of the tongue, allowing for speech and swallowing?

    <p>Hypoglossal (CN XII) (B)</p> Signup and view all the answers

    Which cranial nerve is responsible for both sensory and motor functions related to facial expressions, taste, and tear production?

    <p>Facial (CN VII) (D)</p> Signup and view all the answers

    Flashcards

    Brain hemisphere control

    The left side of the brain controls the right side of the body and vice versa.

    Nervous system functions

    The nervous system controls essential body functions, allowing us to think, feel, and move.

    Pathway of nerve impulses

    Nerve impulses cross pathways from one side of the body to the other.

    Sensory input

    Information received by sensory receptors monitoring changes inside and outside the body.

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    Integration

    The process of interpreting sensory input and deciding on actions to take.

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    Motor function

    The nervous system sends information to effectors like muscles and glands for response.

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    Environmental detection

    The nervous system detects changes in the environment and produces behavioral responses.

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    Complicated body system

    The nervous system is the most complex system, integrating and responding to various stimuli.

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    Sympathetic Nervous System

    Part of the autonomic system that stimulates fight or flight responses.

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    Parasympathetic Nervous System

    Part of the autonomic system that promotes rest and digest activities.

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    Visceral Efferent Fibers

    Nerve fibers that carry signals from CNS to organs, involved in autonomic functions.

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    Cranial Nerves III, VII, IX, X

    Cranial nerves involved in the parasympathetic nervous system.

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    Thoracolumbar Regions

    Spinal cord regions where sympathetic fibers originate.

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    Somatic Nervous System

    Controls voluntary movements via skeletal muscles through sensory feedback.

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    Autonomic Nervous System

    Regulates involuntary bodily functions, including heart rate and digestion.

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    Motor Neurons

    Neurons that carry signals from the CNS to muscles and glands.

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    Skin Receptor

    Sensory structure in the skin that detects stimuli.

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    Afferent Neuron

    Type of neuron that carries sensory impulses to the CNS.

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    Interneuron

    Neuron that connects afferent and efferent neurons in the CNS.

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    Efferent Neuron

    Neuron that carries motor impulses away from the CNS.

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    Somatic System

    Part of the nervous system controlling voluntary muscle movements.

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    Visceral System

    Nervous system part regulating involuntary functions of internal organs.

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    Sympathetic vs Parasympathetic

    Sympathetic prepares for 'fight or flight', parasympathetic promotes 'rest and digest'.

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    Sensory Nerves

    Nerves that carry impulses towards the central nervous system (CNS).

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    Motor Nerves

    Nerves that carry impulses away from the central nervous system (CNS) to effectors.

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    Mixed Nerves

    Nerves that contain both sensory and motor fibers.

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    Spinal Nerves

    Nerves that emerge from the spinal cord, all are mixed nerves.

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    Cranial Nerves

    Nerves that emerge directly from the brain; not all are mixed.

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    Cerebrum

    Part of the brain responsible for conscious perception and movement initiation.

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    Cerebellum

    Part of the brain that coordinates and fine-tunes movement.

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    Brainstem

    The part of the brain that relays sensory input and filters signals.

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    Cranial Nerve I

    The olfactory nerve responsible for the sense of smell.

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    Cranial Nerve II

    The optic nerve responsible for vision.

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    Dendrites

    Thin branching extensions of the cell body that conduct nerve impulses toward the cell body.

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    Axon

    A single branch in most neurons that conducts nerve impulses away from the cell body.

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    Spinal Cord

    The part of the central nervous system housed within the vertebral canal.

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    Cervical Intumescence

    Enlargement of the spinal cord in the neck region where nerves for the upper limbs originate.

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    Lumbar Intumescence

    Enlargement of the spinal cord in the lower back region where nerves for the lower limbs originate.

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    Cauda Equina

    A bundle of nerve roots at the lower end of the spinal cord resembling a horse's tail.

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    Vertebral Pedicles

    The bony structures that connect the spinal processes to the vertebral body in the spinal column.

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    Dorsal View

    A view from the back of the spinal cord and vertebrae layout.

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    Reflex Arc

    A neural pathway that controls a reflex action, bypassing the brain.

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    Afferent Nerves

    Nerves that carry sensory information to the central nervous system (CNS).

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    Efferent Nerves

    Nerves that carry motor commands from the CNS to muscles and glands.

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    Somatic Reflexes

    Reflexes that involve skeletal muscle and are usually voluntary responses.

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    Autonomic Reflexes

    Reflexes that regulate involuntary functions like heart rate and digestion.

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    Integration Center

    Part of the nervous system where sensory input is processed and responses initiated.

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    Effector

    Muscles or glands that carry out the response in a reflex action.

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    Study Notes

    Nervous System Overview

    • The nervous system controls and coordinates all essential body functions
    • Without the nervous system, thinking, feeling, moving, and surviving would be impossible
    • The nervous system's most important function is integrating and responding to the environment
    • The detection of environmental changes, their integration, interpretation, and the subsequent behavioral response are the nervous system's complex functions

    Central Nervous System (CNS)

    • The CNS includes the brain and spinal cord
    • The brain and spinal cord act as the integrating and command center of the entire nervous system
    • The CNS interprets incoming sensory information and directs appropriate actions based on past experiences and current conditions
    • The CNS is the integrative and control center of the nervous system

    Peripheral Nervous System (PNS)

    • The PNS lies outside the CNS, including spinal and cranial nerves
    • It carries nerve impulses from sensory receptors to the CNS and from the CNS to effectors
    • Cranial nerves connect to the brain
    • Spinal nerves connect to the spinal cord
    • Functional Divisions:
      • Afferent (sensory): Conducts impulses toward the spinal cord and brain
      • Efferent (motor): Carries impulses away from the brain and spinal cord to effectors
    • Subdivisions of the PNS:
      • Somatic system: Involved in both sensory and motor functions, determining interaction with the outside environment (includes stimuli detection, responses like locomotion, etc.)
        • Voluntary system
      • Visceral system: Involved in sensory and motor functions related to the internal organs. (Includes processes like blood pressure regulation, heart rate, digestive processes etc.)
        • Involves the autonomic nervous system (ANS)
          • Sympathetic division: Mobilizes body systems during activity (fight-or-flight response)
          • Parasympathetic division: Conserves energy, promoting "housekeeping" functions (rest-and-digest response).

    Structure of the Nervous System

    • Neurons (nerve cells): Basic units of the nervous system
    • Dendrites: Extensions of the neuron's cell body that receive signals
    • Axon: A single branch that transmits signals away from the cell body
    • Sections of the spinal cord: White matter contains myelinated axons, central canal contains cerebrospinal fluid, gray matter contains cell bodies of motor and association neurons
    • The basic elements of the nervous system are the neurons, that have dendrites and axons

    Cranial Nerves

    • The twelve paired cranial nerves originate from the brain
    • Designated by Roman numerals (e.g., I, II, III) and named according to function and location
    • Some cranial nerves are mixed (sensory and motor), some are solely sensory, and others solely motor
    • Examples: Olfactory (I), Optic (II), Oculomotor (III), Trochlear (IV), Trigeminal (V), Abducens (VI), Facial (VII), Vestibulocochlear (VIII), Glossopharyngeal (IX), Vagus (X), Accessory (XI), and Hypoglossal (XII)

    Reflex Arc

    • Reflexes are involuntary, rapid responses to stimuli
    • A basic neural pathway, composed of five essential parts: receptor, sensory neuron, integration center, motor neuron, effector
    • A reflex arc is an automatic response to a stimulus

    Types of Reflexes

    • Somatic reflexes: Control skeletal muscles; example: withdrawing hand from a hot object
    • Autonomic reflexes: Control smooth muscles, heart, and glands; example: regulating blood pressure, digestion

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    CNS & PNS Anatomy (PDF)

    Description

    Test your knowledge of the nervous system, including its structure and functions. This quiz covers the Central Nervous System (CNS) and Peripheral Nervous System (PNS), highlighting their roles in controlling body functions. Challenge your understanding of how the nervous system integrates environmental changes and initiates responses.

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