Peripheral Nervous System Histology
30 Questions
2 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the main function of dendrites in a neuron?

  • Insulation of axons
  • Support and protection of neurons
  • Communication with other neurons (correct)
  • Production of myelin sheath

    • Which type of glial cell supports and protects neurons in the mammalian brain?

  • Astrocytes (correct)
  • Microglia
  • Ependymal cells
  • Oligodendrocytes

    • What is the function of Schwann cells in the peripheral nervous system (PNS)?

  • Communication with other neurons
  • Production of myelin sheath
  • Support and protection of neurons
  • Insulation of axons (correct)

    • What is the main function of satellite cells in the PNS?

    <p>Support and protection of neurons</p> Signup and view all the answers

    What is the purpose of myelin sheath in the PNS?

    <p>Insulation of axons</p> Signup and view all the answers

    Which type of fibers in the PNS are covered by a multilayered myelin sheath produced by Schwann cells?

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

    Which cells outnumber neurons by ten times in the mammalian brain?

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

    What covers the nerve fibers individually and connects them within the PNS?

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

    What is the composition of nerve endings in the PNS?

    <p>Bundles of nerve fibers individually surrounded by Schwann cells and connective tissue</p> Signup and view all the answers

    What is the main function of peripheral nerves in the body?

    <p>Communication between CNS and sense organs and effectors</p> Signup and view all the answers

    Which of the following is NOT a part of the Central Nervous System (CNS)?

    <p>Dorsal root (spinal or sensory) ganglia</p> Signup and view all the answers

    Which type of ganglia is NOT part of the Peripheral Nervous System (PNS)?

    <p>Cranial nerves (those emerge from brain)</p> Signup and view all the answers

    What is the main function of the Peripheral Nervous System (PNS)?

    <p>Receives stimuli</p> Signup and view all the answers

    What is the function of synaptic boutons?

    <p>Conducts impulses away</p> Signup and view all the answers

    What type of cells exhibit mitotic activity in nerve tissue?

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

    What is the purpose of the blood brain barrier?

    <p>Forms a wall that separates nerve cells from connective tissue</p> Signup and view all the answers

    What differentiates nerve cells from connective tissue?

    <p>Blood brain barrier</p> Signup and view all the answers

    Which part of the nervous tissue contains very few connective tissues?

    <p>Nerve cells (neurons)</p> Signup and view all the answers

    What is the main function of dendrites in a neuron?

    <p>Receives stimuli</p> Signup and view all the answers

    Which type of ganglion serves as a relay station to transmit nerve impulses?

    <p>Autonomic ganglia</p> Signup and view all the answers

    Which component of the nervous system forms a network of many billion nerve cells(neurons)?

    <p>Central Nervous System (CNS)</p> Signup and view all the answers

    What type of neurons receive afferent impulses that go to the Central Nervous System?

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

    Which part of the autonomic nervous system is responsible for the fight-or-flight response?

    <p>Sympathetic division</p> Signup and view all the answers

    Where are the nerve cell bodies of parasympathetic nerves located?

    <p>In small ganglia within the innervated organ</p> Signup and view all the answers

    What do Meissner's plexus and Auerbach's plexus provide innervation to?

    <p>Smooth muscle cells</p> Signup and view all the answers

    Which sensory receptors respond to mechanical pressure or distortion?

    <p>Pacinian corpuscles</p> Signup and view all the answers

    Where are Pacinian corpuscles found?

    <p>Glabrous and hairy skin, as well as in the subcutaneous tissue</p> Signup and view all the answers

    What are satellite cells in ganglia?

    <p>Glial cells arranged around the cell bodies of neurons</p> Signup and view all the answers

    What is the role of autonomic nerves in the body?

    <p>Effect the activity of smooth muscle, the secretion of some glands, and heart rate</p> Signup and view all the answers

    What do afferent fibers carry?

    <p>Information from internal body regions and environment to the CNS</p> Signup and view all the answers

    Study Notes

    • The cell body (perykarion) of a neuron contains a large, euchromatic nucleus with a prominent nucleolus and perinuclear cytoplasm rich in rough endoplasmic reticulum and free ribosomes.
    • Dendrites are projection from the cell body that branch many times and provide locations for other neurons to communicate with the cell body. Dendrites receive information from other neurons at synapses.
    • The axon is a single, long process that arises from the cell body, much thinner than the dendrites, and its diameter is related to conduction velocity. It is covered by myelin sheath in the Peripheral Nervous System (PNS) and Schwann cells.
    • Glial cells support and protect neurons, outnumbering them by ten times in the mammalian brain. There are six major types of glial cells: astrocytes, oligodendrocytes, microglia, ependymal cells, Schwann cells, and satellite cells.
    • In the Peripheral Nervous System (PNS), Schwann cells envelop nerve fibers, and they produce a myelin sheath that insulates the axon, allowing for faster action potential propagation and facilitating regeneration of damaged fibers.
    • Satellite cells are cuboidal or squamous glial cells of ganglia that provide metabolic and mechanical support to the neurons.
    • The peripheral nervous system (PNS) is composed of nerves, ganglia, and nerve endings, which are bundles of nerve fibers (axons) individually surrounded by Schwann cells and connective tissue.
    • Myelinated fibers in the PNS are covered by a multilayered myelin sheath produced by Schwann cells, which insulates the axon and facilitates action potential propagation.
    • Unmyelinated axons are surrounded by a single Schwann cell and do not form myelin sheaths and they use action potentials that do not require myelin sheath insulation.
    • Axons and Schwann cells are enclosed within layers of connective tissue, with endoneurium surrounding each axon, perineurium surrounding nerve fascicles, and epineurium surrounding the entire nerve.
    • Peripheral nerves provide communication between the CNS and sense organs and effectors (muscles, glands), and they generally contain both afferent (sensory) and efferent (motor) fibers.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Related Documents

    Histology of Peripheral Nervous System PDF

    Description

    Test your knowledge of the histology of the peripheral nervous system with this quiz. Quiz content covers the anatomical organization, ganglions, nerves, and autonomic ganglia of the peripheral nervous system.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser