Question 1

Which of the following best describes the function of the white matter in the spinal cord?

Accepted Answer

It carries information from place to place via myelinated and unmyelinated axons.

Question 2

A patient presents with a loss of sensation in a specific region of skin on the anterior thigh. Which structure is most likely damaged?

Accepted Answer

A dermatome associated with the lumbar plexus

Question 3

Which meningeal layer is directly attached to the surface of the spinal cord and contains blood vessels supplying the cord?

Accepted Answer

Pia mater

Question 4

Which of the following is TRUE regarding the organization of gray matter in the spinal cord?

Accepted Answer

Anterior horns contain somatic motor nuclei.

Question 5

A person steps on a sharp object and immediately withdraws their foot while shifting their weight to the other leg. Which neural circuit pattern is primarily responsible for this coordinated response?

Accepted Answer

Parallel processing

Question 6

Which of the following best explains why the Babinski reflex is considered abnormal in adults?

Accepted Answer

It suggests a lack of descending inhibition from higher brain centers.

Question 7

Which of the following is a characteristic of a monosynaptic reflex?

Accepted Answer

It involves a single synapse between a sensory and a motor neuron.

Question 8

A patient with carpal tunnel syndrome experiences numbness in the lateral palm and first three fingers. Which nerve is most likely compressed?

Accepted Answer

Median nerve

Question 9

Which of the following best describes the function of the Golgi tendon organ in the tendon reflex?

Accepted Answer

It inhibits muscle contraction to prevent tendon damage.

Question 10

Which of the following statements about spinal nerves is correct?

Accepted Answer

They are formed by the union of anterior and posterior roots.

Question 11

Which nerve plexus is responsible for innervating the diaphragm, and what is the major nerve involved?

Accepted Answer

Cervical plexus; phrenic nerve

Question 12

A patient is unable to extend their wrist and fingers after a humeral fracture. Which nerve is most likely injured?

Accepted Answer

Radial nerve

Question 13

Which of the following best describes the function of the anterior white commissure in the spinal cord?

Accepted Answer

It interconnects the anterior white columns and allows axons to cross from one side of the spinal cord to the other.

Question 14

Which of the following is a correct sequence of the steps in a neural reflex arc?

Accepted Answer

Stimulus → Activation of sensory neuron → Information processing → Activation of motor neuron → Response by effector

Question 15

Which of the following best explains why the spinal cord has enlargements in the cervical and lumbosacral regions?

Accepted Answer

These regions supply nerves to the limbs, requiring more gray matter for processing.

Question 16

Which of the following is a function of the denticulate ligaments?

Accepted Answer

They anchor the pia mater to the arachnoid and dura mater, preventing lateral movement of the spinal cord.

Question 17

Which of the following best describes the effect of reciprocal inhibition during a withdrawal reflex?

Accepted Answer

Flexor muscles contract while extensor muscles relax.

Question 18

Which of the following is a real-life example of an acquired reflex?

Accepted Answer

Braking a car during an emergency

Question 19

Which of the following best describes the role of the brain in modifying spinal reflexes?

Accepted Answer

The brain can facilitate, inhibit, or fine-tune spinal reflexes through descending pathways.

Question 20

Which of the following is a characteristic of polysynaptic reflexes?

Accepted Answer

They involve pools of interneurons and can activate multiple muscle groups.

Chapter 13: The Spinal Cord, Spinal Nerves, and Spinal Reflexes – Study Guide

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