Question 1

Which of the following statements about spinal nerves is correct?

Accepted Answer

All 31 pairs of spinal nerves are mixed nerves, containing both sensory and motor fibers.

Question 2

A patient presents with loss of sensation on the lateral aspect of the forearm and thumb. Which spinal nerve plexus is most likely affected?

Accepted Answer

Brachial plexus

Question 3

Which nerve from the lumbar plexus is responsible for sensation on the medial aspect of the lower leg?

Accepted Answer

Femoral nerve

Question 4

If a patient cannot extend their wrist and fingers, which nerve is most likely damaged?

Accepted Answer

Radial nerve

Question 5

Which of the following is NOT a component of a reflex arc?

Accepted Answer

Cerebral cortex

Question 6

Damage to the sacral plexus would most likely affect which of the following functions?

Accepted Answer

Sensation and movement in the posterior thigh and lower leg

Question 7

Which equation best represents the number of spinal nerves in the human body?

Accepted Answer

$$N = 31$$

Question 8

A patient has lost sensation in the skin over the deltoid region and cannot abduct their arm. Which nerve is most likely involved?

Accepted Answer

Axillary nerve

Question 9

Which of the following best describes a monosynaptic reflex?

Accepted Answer

A reflex with only one synapse between the sensory and motor neuron.

Question 10

If the sciatic nerve is damaged, which of the following symptoms would most likely occur?

Accepted Answer

Weakness in the calf muscles and loss of sensation along the back of the leg

Question 11

Which spinal nerve roots contribute to the brachial plexus?

Accepted Answer

$$C5-T1$$

Question 12

Which reflex is tested by striking the patellar tendon and observing knee extension?

Accepted Answer

Patellar reflex

Question 13

A patient has lost sensation on the lateral aspect of their lower leg and dorsum of the foot. Which nerve is most likely affected?

Accepted Answer

Common fibular (peroneal) nerve

Question 14

Which of the following best describes the function of the phrenic nerve?

Accepted Answer

Innervates the diaphragm for breathing

Question 15

Which of the following is a superficial reflex?

Accepted Answer

Babinski's reflex

Question 16

Which nerve is responsible for sensation on the medial aspect of the thigh and activates adductor muscles?

Accepted Answer

Obturator nerve

Question 17

If a spinal cord injury occurs at the level of $$T12$$, which plexus would most likely be unaffected?

Accepted Answer

Cervical plexus

Question 18

Which of the following is true regarding dermatomes?

Accepted Answer

Dermatomes are regions of skin innervated by specific spinal nerves.

Question 19

Which nerve from the brachial plexus is responsible for sensation on the lateral forearm?

Accepted Answer

Musculocutaneous nerve

Question 20

Which of the following best describes the difference between a reflex and a reaction?

Accepted Answer

A reflex is involuntary and rapid, while a reaction is voluntary and often slower.

Spinal Nerves, Plexuses, and Reflexes: Study Notes for Anatomy & Physiology

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