Question 1

Which of the following best describes the functional organization of the Peripheral Nervous System (PNS)?

Accepted Answer

The PNS is divided into sensory and motor divisions, each further subdivided into somatic and visceral components.

Question 2

A patient presents with loss of sensation in the anterior thigh. Which nerve plexus is most likely affected?

Accepted Answer

Lumbar plexus

Question 3

Which cranial nerve is responsible for the sense of vision and passes through the optic canal of the sphenoid bone?

Accepted Answer

Optic nerve (II)

Question 4

Damage to which cranial nerve would most likely result in difficulty abducting the eye?

Accepted Answer

Abducens nerve (VI)

Question 5

Which of the following is TRUE regarding the phrenic nerve?

Accepted Answer

It innervates the diaphragm and is formed from fibers from C3, C4, and C5.

Question 6

A viral infection causing a painful rash along a dermatome is most likely:

Accepted Answer

Shingles (herpes zoster)

Question 7

Which nerve is the largest branch of the brachial plexus and innervates muscles of the posterior upper limb?

Accepted Answer

Radial nerve

Question 8

Which of the following sensory receptors is most likely to respond to deep pressure and vibration?

Accepted Answer

Lamellar (Pacinian) corpuscles

Question 9

If a patient loses the ability to taste on the anterior two-thirds of the tongue, which cranial nerve is most likely damaged?

Accepted Answer

Facial nerve (VII)

Question 10

Which of the following equations correctly represents the relationship between the number of spinal nerve pairs and their regional distribution?

Accepted Answer

$$8 + 12 + 5 + 5 + 1 = 31$$

Question 11

Which cranial nerve provides parasympathetic innervation to the heart, lungs, and abdominal viscera?

Accepted Answer

Vagus nerve (X)

Question 12

A patient with peripheral neuropathy is most likely to experience which of the following symptoms?

Accepted Answer

Paresthesia, pain, burning, loss of sensation, muscle weakness, and paralysis

Question 13

Which of the following is a function of proprioceptors?

Accepted Answer

Monitor degree of stretch in skeletal muscles, tendons, joints, and ligaments

Question 14

Which nerve innervates the intrinsic hand muscles and skin of the medial hand?

Accepted Answer

Ulnar nerve

Question 15

Which of the following best describes the pathway of the trigeminal nerve’s mandibular division?

Accepted Answer

Passes through the foramen ovale and mandibular foramen

Question 16

Which of the following is TRUE about the sciatic nerve?

Accepted Answer

It is the largest nerve of the sacral plexus and consists of tibial and common fibular branches.

Question 17

Which of the following best describes the function of the dorsal root of a spinal nerve?

Accepted Answer

Contains sensory fibers whose cell bodies are located in the dorsal root ganglion

Question 18

Which of the following is a rapidly adapting receptor for discriminative touch found in sensitive, hairless areas of the skin?

Accepted Answer

Tactile (Meissner’s) corpuscles

Question 19

Which cranial nerve is the only one to extend into the abdomen?

Accepted Answer

Vagus nerve (X)

Ch. 14 - Peripheral Nervous System: Structure, Function, and Clinical Relevance

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