Question 1

Which structure in the spinal cord contains the cell bodies of sensory neurons?

Accepted Answer

Dorsal root ganglion

Question 2

A patient presents with loss of pain and temperature sensation on the right side of the body below the waist. Which pathway is most likely affected, and where does decussation occur?

Accepted Answer

Ascending spinothalamic tract; decussation at the spinal cord level

Question 3

Which area of gray matter in the spinal cord is responsible for sympathetic neuron activity and is only found in thoracic and superior lumbar regions?

Accepted Answer

Lateral horn

Question 4

What is the primary function of the ventral roots of the spinal cord?

Accepted Answer

Transmit motor output from the spinal cord

Question 5

Which of the following best describes the organization of major spinal tracts?

Accepted Answer

They are paired symmetrically on both sides of the spinal cord

Question 6

A lesion in the dorsal horn of the spinal cord would most likely affect which type of neural activity?

Accepted Answer

Somatic and visceral sensory input

Question 7

Which equation best represents the number of neurons in a typical ascending sensory pathway from the periphery to the cortex?

Accepted Answer

$$n = 3$$

Question 8

If the ventral horn motor neurons are damaged, which function would be most directly impaired?

Accepted Answer

Voluntary movement of skeletal muscles

Question 9

Which of the following is TRUE regarding the white matter of the spinal cord?

Accepted Answer

It allows communication between different parts of the spinal cord and between the spinal cord and brain

Question 10

A patient has a spinal cord injury that disrupts the descending corticospinal tract. Which of the following symptoms would most likely be observed?

Accepted Answer

Impaired voluntary motor control

Question 11

Which structure encloses the central canal in the spinal cord?

Accepted Answer

Gray commissure

Question 12

Which direction do transverse fibers in the spinal cord run?

Accepted Answer

From one side of the spinal cord to the other

Question 13

Which of the following best describes decussation in spinal pathways?

Accepted Answer

The crossing of nerve fibers from one side of the CNS to the other

Question 14

Which pathway conducts impulses from cutaneous and proprioceptive receptors to the somatosensory cortex?

Accepted Answer

Ascending spinothalamic pathway

Question 15

If a patient has damage to the lateral horn in the thoracic region, which function is most likely affected?

Accepted Answer

Sympathetic nervous system responses

Question 16

Which of the following is formed by the fusion of dorsal and ventral roots?

Accepted Answer

Spinal nerve

Question 17

A patient with a lesion affecting the dorsal roots of the spinal cord would most likely experience which symptom?

Accepted Answer

Loss of sensory input to the spinal cord

Question 18

Which equation represents the relationship between the number of neurons in a descending motor pathway from the cortex to skeletal muscle?

Accepted Answer

$$n = 2$$

Question 19

Which of the following best describes the function of the dorsal horns in the spinal cord?

Accepted Answer

Receive somatic and visceral sensory input

Question 20

A patient suffers a spinal cord injury that disrupts communication between the left and right sides of the cord. Which fibers are most likely damaged?

Accepted Answer

Transverse commissural fibers

Spinal Cord: Anatomy and Ascending/Descending Pathways

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