Question 1

Which of the following statements about spinal nerves is CORRECT?

Accepted Answer

Spinal nerves C8 emerges between the 7th cervical and 1st thoracic vertebra.

Question 2

A patient presents with loss of sensation on the lateral aspect of the forearm and weakness in elbow flexion. Which nerve from the brachial plexus is MOST likely affected?

Accepted Answer

Musculocutaneous nerve

Question 3

Which spinal nerve plexus is responsible for activating the diaphragm?

Accepted Answer

Cervical plexus

Question 4

If a patient cannot extend their wrist and has loss of sensation on the back of the arm, which nerve is MOST likely damaged?

Accepted Answer

Radial nerve

Question 5

Which of the following is TRUE regarding dermatomes?

Accepted Answer

Dermatomes are strips of skin served by specific spinal nerves.

Question 6

A patient has difficulty abducting their arm and numbness over the deltoid region. Which nerve from the brachial plexus is MOST likely involved?

Accepted Answer

Axillary nerve

Question 7

Which nerve from the lumbar plexus provides sensation to the anterior and lateral aspect of the thigh?

Accepted Answer

Femoral nerve

Question 8

Which of the following is a component of a reflex arc?

Accepted Answer

Receptor

Question 9

A patient presents with loss of sensation on the medial aspect of the lower leg and foot. Which branch of the femoral nerve is MOST likely affected?

Accepted Answer

Saphenous nerve

Question 10

Which of the following reflexes is classified as a cranial reflex?

Accepted Answer

Gag reflex

Question 11

Which equation best represents the relationship between the number of spinal nerves ($N$) and the number of vertebrae ($V$) in the cervical region, given that there are 8 cervical spinal nerves and 7 cervical vertebrae?

Accepted Answer

$N = V + 1$

Question 12

Which nerve from the sacral plexus is responsible for activating hamstring muscles and sensation along the back of the leg and foot?

Accepted Answer

Sciatic nerve

Question 13

Which of the following is TRUE about the thoracic spinal nerves?

Accepted Answer

They run dorsal ventral rami and are intercostal nerves.

Question 14

Which of the following is a polysynaptic spinal reflex?

Accepted Answer

Flexor reflex

Question 15

A patient has loss of sensation in the skin over the medial thigh and weakness in adducting the thigh. Which nerve is MOST likely affected?

Accepted Answer

Obturator nerve

Question 16

Which of the following is NOT a component of the brachial plexus?

Accepted Answer

Phrenic nerve

Question 17

Which superficial cord reflex is tested by stroking the sole of the foot and observing toe movement?

Accepted Answer

Plantar reflex

Question 18

Which of the following best describes a monosynaptic reflex?

Accepted Answer

A reflex involving only one synapse between a sensory and a motor neuron.

Question 19

Which nerve from the brachial plexus is responsible for sensation of the anterior forearm and pinky and half of the ring finger?

Accepted Answer

Ulnar nerve

Question 20

Which of the following is TRUE regarding the integration center in a reflex arc?

Accepted Answer

It may consist of one or more interneurons in the spinal cord.

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

Study Guide - Practice Questions

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