Q: Which of the following equations correctly represents the number of spinal nerves in each region of the vertebral column?

$$8 \; \text{cervical} + 12 \; \text{thoracic} + 5 \; \text{lumbar} + 5 \; \text{sacral} + 1 \; \text{coccygeal} = 31$$

Question 1

Which of the following best describes the function of the spinal cord in relation to sensory and motor information?

Accepted Answer

It acts as a highway for both sensory information traveling to the brain and motor commands traveling from the brain to the body.

Question 2

A patient suffers a spinal cord injury at the level of the cervical enlargement. Which of the following functions is most likely to be affected?

Accepted Answer

Fine motor control of the fingers and hands.

Question 3

The spinal cord ends at approximately which vertebral level in adults, and what is the name of the structure that continues beyond this point?

Accepted Answer

L1-L2; cauda equina

Question 4

Which of the following statements about spinal nerves is correct?

Accepted Answer

There are 31 pairs of spinal nerves, each formed by the union of a dorsal and ventral root.

Question 5

A patient presents with loss of sensation and motor function in the right arm. An MRI reveals damage to the right cervical spinal cord at C5. Which of the following best explains the symptoms?

Accepted Answer

The cervical enlargement contains more neurons for upper limb control, so damage here affects both sensory and motor pathways to the arm.

Question 6

Which of the following best describes the cauda equina?

Accepted Answer

A bundle of spinal nerve roots that extend beyond the conus medullaris in the lower vertebral canal.

Question 7

The phrenic nerve, which is essential for breathing, arises from which spinal nerve roots and which plexus?

Accepted Answer

C3-C5; cervical plexus

Question 8

If a patient has a herniated disc compressing the spinal cord at the level of T12, which of the following symptoms would most likely be observed?

Accepted Answer

Weakness or loss of function in the lower limbs.

Question 9

Which of the following equations correctly represents the number of spinal nerves in each region of the vertebral column?

Accepted Answer

$$8 \; 	ext{cervical} + 12 \; 	ext{thoracic} + 5 \; 	ext{lumbar} + 5 \; 	ext{sacral} + 1 \; 	ext{coccygeal} = 31$$

Question 10

A patient is unable to abduct their arm at the shoulder after a traumatic injury. Which plexus and nerve are most likely involved?

Accepted Answer

Brachial plexus; axillary nerve

Question 11

Which of the following best explains why the spinal cord is shorter than the vertebral column in adults?

Accepted Answer

The vertebral column grows more rapidly than the spinal cord during development.

Question 12

Which structure anchors the spinal cord to the coccyx and helps stabilize it within the vertebral canal?

Accepted Answer

Filum terminale

Question 13

A patient has a lesion affecting the ventral root of a spinal nerve. Which of the following symptoms would you expect?

Accepted Answer

Loss of motor function in the affected area.

Question 14

Which of the following best describes a nerve plexus?

Accepted Answer

A network of intersecting nerves formed by the ventral rami of spinal nerves.

Question 15

If the dorsal root of a spinal nerve is severed, what is the most likely result?

Accepted Answer

Loss of sensation from the area supplied by that nerve.

Question 16

Which of the following is a correct statement about the organization of gray and white matter in the spinal cord?

Accepted Answer

Gray matter is located centrally in an H-shaped pattern, surrounded by white matter.

Question 17

A patient with a spinal cord injury at the level of C3 is at greatest risk for which of the following complications?

Accepted Answer

Respiratory failure due to paralysis of the diaphragm.

Question 18

Which of the following best explains why spinal nerves are considered part of the peripheral nervous system (PNS)?

Accepted Answer

They exit the vertebral column and connect the central nervous system to the rest of the body.

Question 19

Which of the following is the correct order of structures that a sensory signal passes through as it travels from the periphery to the brain?

Accepted Answer

$$	ext{Sensory receptor} ightarrow 	ext{Spinal nerve} ightarrow 	ext{Dorsal root} ightarrow 	ext{Spinal cord} ightarrow 	ext{Brain}$$

Spinal Cord Structure, Function, and Nerve Plexuses

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