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

What is the distribution of nerves that plexus identifies?

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

What are spinal nerves wrapped in?

<p>Several layers of connective tissue (C)</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 (D)</p> Signup and view all the answers

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

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

What does a typical spinal nerve consist of?

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

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

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

From which nerves do the phrenic nerves arise?

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

Where does the coccygeal plexus emerge from?

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

From which cervical nerves is the cervical plexus formed?

<p>C1-C4 (C)</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 (B)</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. (B)</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 (C)</p> Signup and view all the answers

What do spinal nerves connect?

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

What are spinal nerves wrapped in?

<p>Several layers of connective tissue (D)</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 (A)</p> Signup and view all the answers

What is the distribution of nerves of the spinal plexuses?

<p>Cervical, brachial, lumbar, and sacral plexuses (D)</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 (A)</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 (C)</p> Signup and view all the answers

Which nerve supplies motor fibers to the diaphragm?

<p>Phrenic nerve (C)</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 (D)</p> Signup and view all the answers

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

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

From which cervical nerves is the cervical plexus formed?

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

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

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

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

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

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

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

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