Question 1

Which layer of the spinal meninges is described as 'immensely delicate' and adheres directly to the surface of the spinal cord?

Accepted Answer

Pia mater

Question 2

A patient presents with loss of sensation in the skin over the lateral thigh. Which anatomical concept helps you localize the affected spinal nerve?

Accepted Answer

Dermatome

Question 3

Which of the following best describes the function of the posterior (dorsal) root of a spinal nerve?

Accepted Answer

Carries sensory information into the CNS

Question 4

Which enlargement of the spinal cord supplies nerves to the shoulders and arms?

Accepted Answer

Cervical enlargement

Question 5

A reflex arc consists of several steps. Which is the correct order for the first three steps?

Accepted Answer

Receptor activation, sensory neuron activation, information processing

Question 6

Which tract in the white matter of the spinal cord carries sensory information toward the brain?

Accepted Answer

Ascending tract

Question 7

If a patient has damage to the ventral root of a spinal nerve, which function is most likely to be impaired?

Accepted Answer

Motor control of muscles

Question 8

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

Accepted Answer

It contains neuron cell bodies, interneurons, neuroglia, and unmyelinated axons

Question 9

Which nerve plexus is responsible for innervating the diaphragm and is associated with the phrenic nerve?

Accepted Answer

Cervical plexus

Question 10

During a lumbar puncture, cerebrospinal fluid (CSF) is collected from which space?

Accepted Answer

Subarachnoid space

Question 11

A patient is unable to flex their arm and has lost sensation in the lateral forearm. Which nerve plexus is most likely affected?

Accepted Answer

Brachial plexus

Question 12

Which of the following best describes the function of the spinal cord?

Accepted Answer

It serves as a conduit for both sensory and motor information between the brain and the rest of the body

Question 13

Which structure in the spinal cord cross-section contains cerebrospinal fluid (CSF)?

Accepted Answer

Central canal

Question 14

A patient has lost both motor and sensory function in the pelvic area and legs. Which spinal nerve plexus is most likely damaged?

Accepted Answer

Sacral plexus

Question 15

Which of the following equations correctly represents the relationship between the number of spinal cord segments ($$n) $$and the number of pairs of spinal nerves ($$N$$)?

Accepted Answer

$$N = n$$

Question 16

Which of the following is a function of cerebrospinal fluid (CSF) in the spinal cord?

Accepted Answer

Provides shock absorption and nutrient/waste exchange

Question 17

Which of the following is TRUE about the organization of white matter in the spinal cord?

Accepted Answer

It is divided into anterior, posterior, and lateral columns

Question 18

A patient has a spinal cord injury affecting the anterior horn of gray matter. Which function is most likely impaired?

Accepted Answer

Somatic motor control

Question 19

Which of the following best describes a monosynaptic reflex?

Accepted Answer

It is the fastest type of reflex and involves only one synapse

Question 20

If the dorsal root ganglion is damaged, which of the following symptoms would most likely occur?

Accepted Answer

Loss of sensory input from the affected dermatome

The Spinal Cord, Spinal Nerves, and Spinal Reflexes: Anatomy & Physiology Study Guide

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