Question 1

Which of the following best describes the location of the epidural space in relation to the spinal cord and its meninges?

Accepted Answer

Between the dura mater and the vertebral canal

Question 2

A patient receives an anesthetic that blocks the ventral root of a spinal nerve. Which function will most likely be lost in the affected area?

Accepted Answer

Voluntary muscle movement

Question 3

Which of the following is the correct order of the connective tissue layers surrounding a spinal nerve, from outermost to innermost?

Accepted Answer

Epineurium, perineurium, endoneurium

Question 4

Which of the following best describes a dermatome?

Accepted Answer

A region of skin supplied by a single spinal nerve

Question 5

A patient presents with an inability to breathe due to nerve damage. Injury to which nerve plexus is most likely responsible?

Accepted Answer

Cervical plexus

Question 6

Which of the following statements about the gray matter of the spinal cord is correct?

Accepted Answer

It contains neuron cell bodies and is organized into horns

Question 7

Which of the following is a major function of the dorsal root of a spinal nerve?

Accepted Answer

Transmitting sensory information to the spinal cord

Question 8

A patient develops shingles, which is caused by reactivation of the varicella-zoster virus. Which structure is primarily affected?

Accepted Answer

Dorsal root ganglion

Question 9

Which of the following best describes the arrangement of white and gray matter in a cross-section of the spinal cord?

Accepted Answer

Gray matter forms an H-shaped core surrounded by white matter

Question 10

Which of the following equations correctly represents the relationship between the number of spinal nerves ($$N_{sn}$$), the number of cervical nerves ($$N_{c}$$), thoracic nerves ($$N_{t}$$), lumbar nerves ($$N_{l}$$), sacral nerves ($$N_{s}$$), and coccygeal nerves ($$N_{co}$$)?

Accepted Answer

$$N_{sn} = N_{c} + N_{t} + N_{l} + N_{s} + N_{co}$$

Question 11

If a patient has lost sensation in the lateral forearm and weakness in elbow flexion, which nerve plexus is most likely affected?

Accepted Answer

Brachial plexus

Question 12

Which of the following is found within the subarachnoid space of the spinal cord?

Accepted Answer

Cerebrospinal fluid

Question 13

A cross-section of the spinal cord reveals a central canal. What is the primary function of the central canal?

Accepted Answer

To circulate cerebrospinal fluid

Question 14

Which of the following best explains why dermatomes are clinically important?

Accepted Answer

They help localize spinal nerve or spinal cord injuries

Question 15

Which of the following is NOT a major nerve plexus of the body?

Accepted Answer

Thoracic plexus

Question 16

A patient with a herniated disc at the level of L4-L5 is most likely to experience symptoms in which dermatome?

Accepted Answer

L5 dermatome

Question 17

Which of the following best describes the function of the filum terminale?

Accepted Answer

It anchors the spinal cord to the coccyx

Question 18

If the ventral rami of spinal nerves C5-T1 are damaged, which function is most likely to be impaired?

Accepted Answer

Movement and sensation in the upper limb

Question 19

Which of the following best describes the path of a reflex arc in the spinal cord?

Accepted Answer

Receptor → sensory neuron → integration center → motor neuron → effector

Question 20

Which of the following equations best represents the relationship between the number of spinal segments ($$N_{seg}) $$and the number of pairs of spinal nerves ($$N_{sn}$$)?

Accepted Answer

$$N_{seg} = N_{sn}$$

Spinal Cord: Structure, Function, and Clinical Relevance

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