$$\text{Total spinal nerves} = 8 + 12 + 5 + 5 + 1$$

$$\text{Cervical} = 8, \text{Thoracic} = 12, \text{Lumbar} = 5, \text{Sacral} = 5, \text{Coccygeal} = 1$$

$$\text{Total cranial nerves} = 12$$

Question 1

Which connective tissue layer directly surrounds individual axons and their myelin sheaths within a peripheral nerve?

Accepted Answer

Endoneurium

Question 2

A patient presents with paralysis of the diaphragm and requires mechanical ventilation. Which spinal nerve roots are most likely damaged?

Accepted Answer

C3–C5

Question 3

Which nerve is compressed in carpal tunnel syndrome, resulting in loss of 'pincer grasp'?

Accepted Answer

Median nerve

Question 4

Damage to which nerve results in the clinical presentation known as 'claw hand'?

Accepted Answer

Ulnar nerve

Question 5

Which nerve is responsible for innervating the quadriceps femoris muscle, allowing thigh flexion and leg extension?

Accepted Answer

Femoral nerve

Question 6

If a patient cannot extend their hand at the wrist, which nerve is most likely damaged?

Accepted Answer

Radial nerve

Question 7

Which of the following statements about spinal nerves is correct?

Accepted Answer

Spinal nerves are mixed, containing both sensory and motor fibers

Question 8

Which region of the spinal cord gives rise to nerves that form the brachial plexus?

Accepted Answer

C5–T1

Question 9

A patient presents with stabbing pain radiating down the posterior thigh and leg. Which nerve is most likely affected?

Accepted Answer

Sciatic nerve

Question 10

Which equation best represents the relationship between the number of spinal nerves and their regional distribution?

Accepted Answer

$$	ext{Total spinal nerves} = 8 + 12 + 5 + 5 + 1$$

Question 11

Which structure is formed by the mingling of ventral and dorsal roots and immediately divides into rami after exiting the vertebral column?

Accepted Answer

Spinal nerve

Question 12

Which nerve is most likely to be injured by a poorly placed injection in the buttock, resulting in footdrop?

Accepted Answer

Sciatic nerve

Question 13

Which of the following is TRUE regarding the regeneration of nerves?

Accepted Answer

PNS nerves can regenerate if the soma is intact and damage is not severe

Question 14

Which equation describes the distribution of spinal nerve pairs by region?

Accepted Answer

$$	ext{Cervical} = 8, 	ext{Thoracic} = 12, 	ext{Lumbar} = 5, 	ext{Sacral} = 5, 	ext{Coccygeal} = 1$$

Question 15

Which nerve is responsible for the sensation of the 'funny bone' when struck at the elbow?

Accepted Answer

Ulnar nerve

Question 16

Which of the following best describes the function of the dorsal rami of spinal nerves?

Accepted Answer

Innervate posterior trunk, including skin and muscles

Question 17

Which nerve is most likely damaged if a patient loses the ability to plantar flex the foot, resulting in a shuffling gait?

Accepted Answer

Tibial nerve

Question 18

Which equation represents the total number of cranial nerves?

Accepted Answer

$$	ext{Total cranial nerves} = 12$$

Question 19

Which nerve is formed by the ventral rami of C3–C5 and is essential for breathing?

Accepted Answer

Phrenic nerve

Question 20

Which of the following is TRUE regarding the formation of nerve plexuses?

Accepted Answer

Ventral rami of cervical, brachial, lumbar, and sacral regions form plexuses

Peripheral Nervous System: Structure, Classification, and Major Nerve Plexuses

Study Guide - Practice Questions