Nervous System Histology Quiz
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Questions and Answers

What is the main functional unit of the nervous system?

  • Ganglia
  • Synapses
  • Neurons (correct)
  • Glial cells
  • Which part of the neuron is responsible for receiving stimuli from other neurons?

  • Perikaryon
  • Dendrites (correct)
  • Axon
  • Neurolemma
  • Which major division of the nervous system includes the brain and spinal cord?

  • Central Nervous System (correct)
  • Somatic Nervous System
  • Autonomic Nervous System
  • Peripheral Nervous System
  • What is neurolemma?

    <p>The cell membrane of a neuron (B)</p> Signup and view all the answers

    Which of the following statements about axons is true?

    <p>Axons can conduct nerve impulses to multiple cell types. (C)</p> Signup and view all the answers

    Which component of a neuron contains the nucleus and organelles?

    <p>Cell body (perikaryon) (D)</p> Signup and view all the answers

    What is the role of glial cells in the nervous system?

    <p>Providing support and insulation for neurons (C)</p> Signup and view all the answers

    Which of the following best describes the organization of the peripheral nervous system?

    <p>It connects the CNS to limbs and organs through nerves and ganglia. (D)</p> Signup and view all the answers

    Which type of neuron has one axon and two or more dendrites?

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

    Where are bipolar neurons typically found?

    <p>In the olfactory mucosa (B)</p> Signup and view all the answers

    What distinguishes unipolar or pseudounipolar neurons?

    <p>They have a single process that bifurcates (D)</p> Signup and view all the answers

    What type of neurons are considered to establish relationships among other neurons?

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

    What is the primary function of sensory neurons?

    <p>To receive stimuli from receptors (A)</p> Signup and view all the answers

    In which part of the CNS do most neuronal perikarya occur?

    <p>In the gray matter (C)</p> Signup and view all the answers

    What is the primary effect of Parkinson disease on neurons?

    <p>Gradual loss of dopamine-producing neurons (B)</p> Signup and view all the answers

    What is the primary role of the cell body (perikaryon) in a neuron?

    <p>Producing cytoplasm for the neuron's processes (A)</p> Signup and view all the answers

    What occurs at the initial segment of a neuron?

    <p>Algebraic summation of excitatory and inhibitory stimuli. (C)</p> Signup and view all the answers

    What is primarily absent in axoplasm compared to the cell body?

    <p>Polyribosomes and rough ER (B)</p> Signup and view all the answers

    Which protein is responsible for anterograde transport in axonal transport?

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

    What characterizes synaptic transmission between neurons?

    <p>It converts electrical signals to chemical signals. (B)</p> Signup and view all the answers

    What happens to the peripheral part of an axon if it is severed?

    <p>It quickly degenerates. (B)</p> Signup and view all the answers

    How do neurotransmitters typically affect postsynaptic neurons?

    <p>By binding to receptor proteins to regulate ion channels. (B)</p> Signup and view all the answers

    What structural feature at the end of an axon facilitates synaptic communication?

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

    What type of transport carries material taken up by endocytosis back to the cell body?

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

    What does the presence of a highly developed rough endoplasmic reticulum (RER) in neurons indicate?

    <p>There is active production of cytoskeletal proteins. (D)</p> Signup and view all the answers

    What is Nissl substance primarily composed of?

    <p>Concentrated rough endoplasmic reticulum and polyribosomes. (A)</p> Signup and view all the answers

    What is the main function of dendritic spines in neurons?

    <p>To facilitate signal reception and processing. (B)</p> Signup and view all the answers

    How do dendrites differ from axons in their structural characteristics?

    <p>Dendrites subdivide into thinner branches. (D)</p> Signup and view all the answers

    What is the role of the axon hillock in neuron structure?

    <p>It generates action potentials. (A)</p> Signup and view all the answers

    What characterizes the organization of the cytoplasm in the base of dendrites?

    <p>It is similar to that of the perikaryon. (D)</p> Signup and view all the answers

    What term is often used to describe intermediate filaments in neurons?

    <p>Neurofilaments. (D)</p> Signup and view all the answers

    What is the function of the Golgi apparatus in neurons?

    <p>To package and transport proteins. (D)</p> Signup and view all the answers

    Flashcards

    Nervous System

    The most complex system in the body, responsible for communication and control.

    Neurons

    Specialized cells that transmit information in the nervous system.

    Glial Cells

    Supporting cells that help neurons function properly.

    Synapse

    A junction between two neurons, where signals are transmitted from one neuron to another.

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    Cell Body/Perikaryon

    The central part of a neuron, containing the nucleus and most of the cell's organelles.

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    Dendrites

    Branches extending from the cell body, specialized to receive signals from other neurons.

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    Axon

    A single long process extending from the cell body, responsible for transmitting signals to other cells.

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    Central Nervous System (CNS)

    The brain and spinal cord, forming the central control center of the nervous system.

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    Multipolar neuron

    Neurons with one axon and two or more dendrites. They are the most common type of neuron in the nervous system.

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    Bipolar neuron

    Neurons with one dendrite and one axon. They are found in sensory organs like the retina and olfactory mucosa.

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    Unipolar neuron

    Neurons with a single process that splits into two branches, one going to the periphery and the other to the central nervous system.

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    Anaxonic neuron

    Neurons with multiple dendrites but no true axon. They do not generate action potentials but regulate electrical activity of nearby neurons.

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    Sensory neuron

    Neurons that receive sensory information from the body and transmit it to the central nervous system.

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    Motor neuron

    Neurons that carry signals from the central nervous system to muscles and glands.

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    Interneuron

    Neurons that connect other neurons within the central nervous system, forming networks and circuits.

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    Initial Segment

    The area on the axon where excitatory and inhibitory signals are summed to decide whether to initiate a nerve impulse.

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    Axolemma

    The plasma membrane of the axon, containing ion channels essential for generating action potentials.

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    Terminal Boutons

    The specialized endings of an axon that form junctions with other neurons or cells, transmitting signals.

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    Axoplasm

    The cytoplasm of the axon, containing organelles and other molecules for its function.

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    Anterograde Transport

    Movement of materials from the cell body to the axon terminals, transporting essential molecules and components.

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    Retrograde Transport

    Movement of materials from the axon terminals back to the cell body, carrying recycled materials and signals.

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    Kinesin and Dynein

    Motor proteins located on microtubules that move molecules and organelles along the axon.

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    Axon Hillock

    The area where axons originate from the cell body, often shaped like a pyramid. It is the site where the axon's electrical impulse starts.

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    Chromatophilic Substance (Nissl Bodies)

    A region of the cell body rich in ribosomes and rough endoplasmic reticulum, giving it a basophilic appearance in histological staining. It indicates active protein synthesis for the neuron.

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    Dendritic Spines

    Specialized structures on dendrites that serve as the first point of processing for synaptic signals.

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    Axon Hillock

    The specialized area within the neuron responsible for integrating incoming signals from dendrites and generating outgoing signals along the axon.

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    Study Notes

    Nervous System Histology

    • The nervous system is the body's most intricate system, composed of a vast network of nerve cells (neurons) and supporting glial cells.
    • Neurons have extensive connections enabling complex information processing and response generation.
    • Nerve tissue is distributed throughout the body as an integrated communications network.
    • The nervous system has two major divisions: central and peripheral.

    Central Nervous System (CNS)

    • The CNS comprises the brain and spinal cord.
    • It processes information and directs bodily functions.

    Peripheral Nervous System (PNS)

    • The PNS includes cranial, spinal, and peripheral nerves.
    • It transmits impulses to and from the CNS, categorized into sensory (afferent) and motor (efferent) nerves.
    • Ganglia (small clusters of nerve cells) are also part of the PNS and are located outside the CNS.

    Neurons: Functional Units

    • Neurons are the functional units of the CNS and PNS.
    • They consist of a cell body (perikaryon), dendrites, and an axon.
    • The perikaryon contains the nucleus and most organelles, essential for neuron function.
    • Dendrites are branched extensions that receive signals (stimuli) from other neurons.
    • Axons are long, slender projections that transmit signals from the cell body to other neurons or effector organs.

    Neuron Structure Details

    • Cell Body (Perikaryon): Contains the nucleus and most organelles; essential for neuron function.
    • Dendrites: Branched extensions that receive signals (stimuli) from other neurons.
    • Axon (Axon): A long, slender projection that transmits signals from the cell body to other neurons or effector organs.
    • Axon Structure: The axon's plasma membrane is the axolemma. The interior contents are axoplasm.
    • **Axon Divisions:**The initial segment of the axon is where signals are summed before transmission. Axons can branch, forming collateral axons that extend to other neurons.

    Neuron Classification

    • Multipolar Neurons: Most common type; one axon and multiple dendrites.
    • Bipolar Neurons: One axon and one dendrite; found in sensory systems.
    • Unipolar (Pseudounipolar) Neurons: One process that branches into two extensions; found in sensory pathways.
    • Anaxonic Neurons: Many dendrites but no distinct axon; primarily involved in local circuits.

    Neuron Functionally Classified

    • Motor Neurons: Efferent neurons that transmit signals from the CNS to muscles or glands.
    • Sensory Neurons: Afferent neurons that transmit signals from sensory receptors to the CNS.
    • Interneurons: Form complex communication networks within the CNS.

    Neural Tissues

    • Functional neurons comprise the main component of the nervous system.
    • Other neural elements, such as the supporting glial cells contribute to the correct function.

    Synaptic Communication

    • Synapses are junctions between neurons where impulses are transmitted.
    • A synapse includes a presynaptic axon terminal (terminal bouton) and a postsynaptic cell membrane.
    • Presynaptic terminals release neurotransmitters into the synaptic cleft to initiate signals across the synapse.

    Synapse Types

    • Axosomatic synapse: Synapse between axon and cell body.
    • Axodendritic synapse: Synapse between axon and dendrite.
    • Axoaxonic synapse: Synapse between axon and axon.

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