Peripheral Nervous System (PNS) Overview
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Questions and Answers

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

  • To carry impulses to and from the brain (correct)
  • To carry only sensory information from the CNS
  • To coordinate voluntary muscle movements
  • To carry impulses within the brain and spinal cord

    • Which division of the Peripheral Nervous System (PNS) is responsible for conveying impulses from sensory receptors to the CNS?

  • Efferent division
  • Motor division
  • Somatic sensory division (correct)
  • Visceral sensory division

    • What is the function of the Motor division in the Peripheral Nervous System (PNS)?

  • Transmit impulses solely to the brain
  • Control voluntary muscle movements
  • Convey impulses from sensory receptors to the CNS
  • Bring about motor responses in effector organs (correct)

    • Which type of fibers transmit impulses from visceral organs to the CNS in the Peripheral Nervous System (PNS)?

    <p>Visceral sensory fibers</p> Signup and view all the answers

    What distinguishes the Somatic Nervous System (SNS) from the Autonomic Nervous System (ANS)?

    <p>The ANS regulates involuntary body functions</p> Signup and view all the answers

    Why is not all skeletal muscle activity controlled by the Somatic Nervous System (SNS) considered voluntary?

    <p>Because it involves subconscious reflex actions</p> Signup and view all the answers

    What type of brain tumors are most common?

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

    Which cell type plays a key role in circulating cerebrospinal fluid?

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

    What function do astrocytes serve in relation to neurons?

    <p>Control the chemical environment</p> Signup and view all the answers

    Which glial cell type wraps nerve fibers with myelin sheaths?

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

    What is the primary role of microglia in the CNS?

    <p>Dispose of debris</p> Signup and view all the answers

    Which glial cell type forms a living barrier between capillaries and neurons?

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

    What is the function of glutamate, GABA, dopamine, serotonin, acetylcholine, norepinephrine, and histamine in the nervous system?

    <p>They transmit messages between neurons or from neurons to muscles</p> Signup and view all the answers

    What is the primary reason why blood-borne alcohol, nicotine, and anesthetics can affect the brain?

    <p>They are lipid-soluble molecules that effectively cross plasma membranes.</p> Signup and view all the answers

    What is the function of the synaptic cleft?

    <p>It is where communication between two neurons takes place</p> Signup and view all the answers

    Which region of the Spinal Cord is enlarged where nerves serving the upper and lower limbs leave?

    <p>Cervical region</p> Signup and view all the answers

    Which type of cells myelinate axons outside the central nervous system?

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

    What type of responses does the neuron and synapse networks in the Spinal Cord produce to sensory stimulation?

    <p>Involuntary responses</p> Signup and view all the answers

    What is the function of myelin sheath around nerve fibers?

    <p>Increase transmission of nerve impulses</p> Signup and view all the answers

    What is the role of neurilemma (sheath of Schwann) in peripheral nerve fiber regeneration?

    <p>It plays an important role in fiber regeneration</p> Signup and view all the answers

    Where are the cell bodies of sensory neurons located in the spinal cord?

    <p>Dorsal root ganglion</p> Signup and view all the answers

    What are Nodes of Ranvier?

    <p>Gaps or indentations between Schwann cells</p> Signup and view all the answers

    Which part of the gray matter in the spinal cord contains motor neurons of the somatic nervous system?

    <p>Anterior horns</p> Signup and view all the answers

    What is the function of ascending tracts in the spinal cord?

    <p>Carry sensory input to the brain</p> Signup and view all the answers

    What is the function of the olfactory nerve?

    <p>Carries impulses for the sense of smell</p> Signup and view all the answers

    Which nerve supplies motor fibers to four of the six muscles that control eye movement?

    <p>Trochlear nerve</p> Signup and view all the answers

    What is the main function of the trigeminal nerve?

    <p>Activates the chewing muscles</p> Signup and view all the answers

    Which division of the autonomic nervous system is known as the 'fight-or-flight' system?

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

    Where are the first neurons of the sympathetic division located?

    <p>In the gray matter of the spinal cord from T1 through L2</p> Signup and view all the answers

    What type of fibers does the vestibulocochlear nerve mainly transmit?

    <p>Auditory impulses</p> Signup and view all the answers

    Which nerve supplies motor fibers to activate the sternocleidomastoid and trapezius muscles?

    <p>Accessory nerve (Spinal)</p> Signup and view all the answers

    What is the main function of the glossopharyngeal nerve?

    <p>Carry impulses from taste buds of posterior tongue</p> Signup and view all the answers

    Which nerve carries both sensory impulses from skin of face and mucosa, and motor fibers that activate chewing muscles?

    <p>Trigeminal nerve</p> Signup and view all the answers

    What function does the facial nerve mainly regulate?

    <p>Movements of facial expression muscles</p> Signup and view all the answers

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