Question 1

Which of the following correctly lists the number of vertebrae in each region of the vertebral column, from superior to inferior?

Accepted Answer

7 cervical, 12 thoracic, 5 lumbar, 1 sacral (fused of 5 bones), 1 coccygeal (fused of 3 bones)

Question 2

A patient suffers a spinal cord injury at the level of T8. Which pair of spinal nerves is most likely to be directly affected?

Accepted Answer

Thoracic spinal nerves

Question 3

Which structure is described as a cone-shaped ending of the spinal cord, typically found at the level of the first or second lumbar vertebra?

Accepted Answer

Conus medullaris

Question 4

The cauda equina is best described as:

Accepted Answer

A collection of spinal nerves within the subarachnoid space inferior to the conus medullaris

Question 5

Which meningeal layer is located directly superficial to the spinal cord?

Accepted Answer

Pia mater

Question 6

A lumbar puncture is performed to collect cerebrospinal fluid (CSF). Into which space is the needle inserted?

Accepted Answer

Subarachnoid space

Question 7

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

Accepted Answer

It anchors the spinal cord to the coccyx

Question 8

Which of the following is TRUE regarding the organization of gray and white matter in a cross-section of the spinal cord?

Accepted Answer

White matter is found on the outside, gray matter on the inside

Question 9

A histological slide of the spinal cord shows large neuron cell bodies in the ventral horn. These are most likely:

Accepted Answer

Motor neurons

Question 10

Which of the following best describes the dorsal root ganglion?

Accepted Answer

Contains cell bodies of unipolar sensory neurons

Question 11

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

Accepted Answer

Motor output to skeletal muscles

Question 12

Which of the following equations correctly represents the total number of spinal nerves in the human body?

Accepted Answer

$8 + 12 + 5 + 5 + 1 = 31$

Question 13

Which of the following best explains why the spinal cord does not extend the entire length of the vertebral column in adults?

Accepted Answer

The vertebral column grows faster than the spinal cord during development

Question 14

A cross-section of the spinal cord reveals myelinated axons in the white matter. Which cell type is responsible for myelination in the central nervous system?

Accepted Answer

Oligodendrocytes

Question 15

During a spinal tap, a physician must avoid puncturing which meningeal layer to prevent direct injury to the spinal cord?

Accepted Answer

Pia mater

Question 16

Which of the following best describes the function of the central canal in the spinal cord?

Accepted Answer

It is filled with cerebrospinal fluid and lined by ependymal cells

Question 17

A patient presents with loss of sensation in the right arm and weakness in the right leg. Which spinal cord structures are most likely affected?

Accepted Answer

Right dorsal horn and right ventral horn

Question 18

Which of the following is a correct description of the epidural space?

Accepted Answer

It is located between the dura mater and the vertebral bone and contains fat and blood vessels

Question 19

Which of the following best describes the ramus communicans?

Accepted Answer

A branch of a spinal nerve that connects to the sympathetic chain

Question 20

Which of the following statements about the dorsal and ventral rami is correct?

Accepted Answer

Ventral rami innervate the anterior and lateral trunk and limbs, dorsal rami innervate the muscles and skin of the back

Anatomy of the Spinal Cord: Structure, Segmentation, and Histology

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