Question 1

Which connective tissue layer directly surrounds each individual axon within a peripheral nerve?

Accepted Answer

Endoneurium

Question 2

A patient presents with loss of vision. Which cranial nerve is most likely affected?

Accepted Answer

Optic nerve (II)

Question 3

Which cranial nerve is responsible for innervating the lateral rectus muscle of the eye?

Accepted Answer

Abducens nerve (VI)

Question 4

Which cranial nerve carries both motor fibers to muscles of facial expression and parasympathetic fibers to salivary glands?

Accepted Answer

Facial nerve (VII)

Question 5

Which nerve is responsible for hearing and balance?

Accepted Answer

Vestibulocochlear nerve (VIII)

Question 6

Damage to which cranial nerve would most likely result in difficulty swallowing and loss of taste in the posterior third of the tongue?

Accepted Answer

Glossopharyngeal nerve (IX)

Question 7

Which cranial nerve has both sensory and motor functions and innervates the heart, lungs, and digestive organs?

Accepted Answer

Vagus nerve (X)

Question 8

Which nerve is responsible for innervating the trapezius and sternocleidomastoid muscles?

Accepted Answer

Accessory nerve (XI)

Question 9

Which nerve innervates the intrinsic and extrinsic muscles of the tongue?

Accepted Answer

Hypoglossal nerve (XII)

Question 10

A patient has numbness in the skin over the lateral forearm. Which nerve is most likely affected?

Accepted Answer

Musculocutaneous nerve

Question 11

Which plexus is responsible for innervating the diaphragm?

Accepted Answer

Cervical plexus

Question 12

Which nerve is formed from the ventral rami of L4-S3 and is the largest nerve in the body?

Accepted Answer

Sciatic nerve

Question 13

Which of the following is a rapidly adapting mechanoreceptor found in dermal papillae of hairless skin?

Accepted Answer

Meissner's corpuscles

Question 14

Which sensory receptor is responsible for detecting deep pressure and stretch, and is slowly or nonadapting?

Accepted Answer

Ruffini's corpuscles

Question 15

Which of the following best describes the pathway of a reflex arc?

Accepted Answer

Stimulus → Receptor → Sensory neuron → Integration center → Motor neuron → Effector

Question 16

Which neurotransmitter is released at the neuromuscular junction in the somatic nervous system?

Accepted Answer

Acetylcholine

Question 17

Which equation best represents the relationship between the number of spinal nerves and vertebral levels?

Accepted Answer

$$N_{spinal} = N_{cervical} + N_{thoracic} + N_{lumbar} + N_{sacral} + N_{coccygeal}$$

Question 18

Which nerve is most likely damaged if a patient cannot abduct their eye?

Accepted Answer

Abducens nerve (VI)

Question 19

Which cranial nerve passes through the superior orbital fissure and innervates the superior oblique muscle?

Accepted Answer

Trochlear nerve (IV)

Question 20

Which of the following is true regarding the parasympathetic fibers of the vagus nerve?

Accepted Answer

They innervate the heart, lungs, and most abdominal organs

Peripheral Nervous System: Structure, Cranial Nerves, and Sensory Receptors

Study Guide - Practice Questions