Anatomy of the Nervous System - Spinal Nerves
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Questions and Answers

What is the main function of spinal nerves?

  • Connecting the CNS to sensory receptors, muscles, and glands (correct)
  • Connecting muscles to the brain
  • Connecting the CNS to the brain
  • Connecting sensory receptors to the brain
  • How many pairs of spinal nerves are there?

  • 32 pairs
  • 30 pairs
  • 31 pairs (correct)
  • 28 pairs
  • Where does the spinal cord end in relation to the vertebrae?

  • Near the level of the first lumbar vertebra
  • Near the level of the second lumbar vertebra (correct)
  • Near the level of the fourth lumbar vertebra
  • Near the level of the third lumbar vertebra
  • What is the arrangement called where the roots of the lumbar, sacral, and coccygeal nerves descend at an angle to reach their respective foramina before emerging from the vertebral column?

    <p>Cauda equina</p> Signup and view all the answers

    What is the distribution of nerves that plexus identifies?

    <p>Cervical, brachial, lumbar, and sacral plexuses</p> Signup and view all the answers

    What are spinal nerves wrapped in?

    <p>Several layers of connective tissue</p> Signup and view all the answers

    Where do most of the spinal nerves emerge from the spinal cord?

    <p>Intervertebral foramina between adjoining vertebrae</p> Signup and view all the answers

    Which nerve exits the vertebral canal between vertebrae C7 and T1?

    <p>Spinal nerve C8</p> Signup and view all the answers

    What does a typical spinal nerve consist of?

    <p>Posterior root and anterior root</p> Signup and view all the answers

    What do axons from the anterior rami of spinal nerves form?

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

    Which plexus supplies the skin and muscles of the head, neck, and superior part of the shoulders and chest?

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

    From which nerves do the phrenic nerves arise?

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

    Where does the coccygeal plexus emerge from?

    <p>Sacral canal via sacral hiatus</p> Signup and view all the answers

    From which cervical nerves is the cervical plexus formed?

    <p>C1-C4</p> Signup and view all the answers

    How many pairs of anterior and posterior sacral foramina do spinal nerves S1-S4 exit through?

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

    What is the clinical significance of dermatomes?

    <p>They help in diagnosing neurological conditions by identifying the areas of skin supplied by specific spinal nerves.</p> Signup and view all the answers

    What is the function of the cauda equina?

    <p>To allow for continued nerve communication beyond the end of the spinal cord</p> Signup and view all the answers

    What do spinal nerves connect?

    <p>Central nervous system to sensory receptors, muscles, and glands</p> Signup and view all the answers

    What are spinal nerves wrapped in?

    <p>Several layers of connective tissue</p> Signup and view all the answers

    Where does the spinal cord end in relation to the vertebral column?

    <p>Near the level of L2 vertebra</p> Signup and view all the answers

    What is the distribution of nerves of the spinal plexuses?

    <p>Cervical, brachial, lumbar, and sacral plexuses</p> Signup and view all the answers

    Which spinal nerves emerge from the spinal cord through the intervertebral foramina between adjoining vertebrae?

    <p>T1–L5</p> Signup and view all the answers

    Where do the roots of the sacral spinal nerves and the coccygeal spinal nerves enter from the spinal cord?

    <p>Sacral canal</p> Signup and view all the answers

    Which nerve supplies motor fibers to the diaphragm?

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

    Which pairs of anterior and posterior sacral foramina do spinal nerves S1–S4 exit via?

    <p>Four pairs</p> Signup and view all the answers

    What do axons from the anterior rami of spinal nerves form?

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

    From which cervical nerves is the cervical plexus formed?

    <p>C1–C4</p> Signup and view all the answers

    Where does a typical spinal nerve unite to form a spinal nerve?

    <p>At the intervertebral foramen</p> Signup and view all the answers

    Which part of the vertebral canal do spinal nerves T1–L5 exit below?

    <p>Below L5</p> Signup and view all the answers

    What do axons from the anterior rami of adjacent nerves form?

    <p>Networks (plexuses)</p> Signup and view all the answers

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