Question 1

Which structure contains the cell bodies of sensory neurons entering the spinal cord?

Accepted Answer

Dorsal root ganglion

Question 2

A patient presents with loss of sensation in the skin overlying the deltoid muscle and weakness in shoulder abduction. Which nerve is most likely affected?

Accepted Answer

Axillary nerve

Question 3

Which of the following best describes the organization of the brachial plexus from proximal to distal?

Accepted Answer

Roots, trunks, divisions, cords, branches

Question 4

The femoral nerve is formed from which spinal nerve roots and passes deep to which ligament?

Accepted Answer

L2-L4; inguinal ligament

Question 5

Which nerve is responsible for innervating the flexor muscles of the anterior forearm and some muscles of the hand?

Accepted Answer

Median nerve

Question 6

A patient with a herniated disc at the L4-L5 level is most likely to experience sensory loss in which dermatome?

Accepted Answer

L5

Question 7

Which of the following statements about the sympathetic division of the autonomic nervous system is correct?

Accepted Answer

Preganglionic neurons are short and originate from the thoracolumbar region

Question 8

Which nerve passes through the obturator foramen to innervate the medial thigh muscles?

Accepted Answer

Obturator nerve

Question 9

A patient with shingles has a rash that follows a band-like pattern on the skin. This pattern corresponds to which anatomical concept?

Accepted Answer

Dermatome

Question 10

Which of the following best explains why the ventral rami of T2-T12 do not form plexuses?

Accepted Answer

They become intercostal nerves and directly innervate the thoracic wall

Question 11

Which nerve is formed by the merging of the tibial and common fibular nerves and passes through the greater sciatic notch?

Accepted Answer

Sciatic nerve

Question 12

Which of the following is a function of the dorsal rami of spinal nerves?

Accepted Answer

Innervate intrinsic muscles of the back and dorsal skin

Question 13

A patient is unable to extend their wrist and fingers and has sensory loss over the posterior forearm and hand. Which nerve is most likely damaged?

Accepted Answer

Radial nerve

Question 14

Which of the following best describes the pathway of sympathetic preganglionic fibers to the adrenal medulla?

Accepted Answer

They pass through the sympathetic trunk without synapsing and synapse directly on adrenal medullary cells

Question 15

Which nerve is responsible for the cutaneous innervation of the medial side of the hand, including the little finger?

Accepted Answer

Ulnar nerve

Question 16

A patient has difficulty flexing the hip and extending the knee. Which nerve is most likely affected?

Accepted Answer

Femoral nerve

Question 17

Which of the following statements about dermatomes is correct?

Accepted Answer

Each dermatome is innervated by a single spinal nerve except C1

Question 18

Which nerve is most likely to be injured if a patient cannot dorsiflex the foot and has sensory loss over the dorsum of the foot?

Accepted Answer

Common fibular nerve

Question 19

Which of the following is true regarding the organization of the lumbar and sacral plexuses?

Accepted Answer

The lumbar plexus lies within the psoas muscle and the sacral plexus is caudal to it

Question 20

Which of the following best describes the function of rami communicantes?

Accepted Answer

They connect spinal nerves to the sympathetic trunk ganglia

Peripheral Nervous System: Spinal Nerves, Plexuses, and Innervation

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