Question 1

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

Accepted Answer

It contains sensory axons that bring information into the spinal cord.

Question 2

A patient presents with loss of sensation in the skin overlying the lateral thigh. Which spinal nerve region is most likely affected?

Accepted Answer

Lumbar

Question 3

Which structure anchors the spinal cord laterally to prevent excessive movement within the vertebral canal?

Accepted Answer

Denticulate ligaments

Question 4

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

Accepted Answer

Gray matter contains neuron cell bodies, neuroglia, and unmyelinated axons.

Question 5

A patient suffers a spinal cord injury at the level of the lumbosacral enlargement. Which function is most likely to be impaired?

Accepted Answer

Movement and sensation in the pelvis and lower limbs

Question 6

Which of the following best describes the function of the phrenic nerve?

Accepted Answer

It provides sensory and motor innervation to the diaphragm.

Question 7

Which neural circuit pattern is responsible for amplifying a signal so that one neuron can activate multiple effectors simultaneously?

Accepted Answer

Divergence

Question 8

A patient steps on a sharp object and immediately withdraws their foot while the opposite leg extends to support their weight. Which reflexes are involved?

Accepted Answer

Polysynaptic withdrawal and crossed extensor reflexes

Question 9

Which of the following statements about the blood-brain barrier is correct?

Accepted Answer

It is formed by tight junctions between capillary endothelial cells and regulated by astrocytes.

Question 10

Which brain region is primarily responsible for relaying sensory information to the cerebral cortex and filtering incoming signals?

Accepted Answer

Thalamus

Question 11

Damage to the substantia nigra would most likely result in which clinical condition?

Accepted Answer

Parkinson’s disease

Question 12

Which of the following is a function of the cerebellum?

Accepted Answer

Programming and fine-tuning conscious and unconscious movements

Question 13

Which cranial nerve is responsible for transmitting visual information from the retina to the brain?

Accepted Answer

Optic nerve (II)

Question 14

A patient with Bell’s palsy would most likely exhibit which of the following symptoms?

Accepted Answer

Paralysis of facial muscles on one side

Question 15

Which of the following best describes the function of the corticospinal tract?

Accepted Answer

It provides conscious control over skeletal muscle movements.

Question 16

Which type of sensory receptor is responsible for detecting changes in muscle length and is involved in the stretch reflex?

Accepted Answer

Muscle spindle

Question 17

Which of the following best explains why referred pain occurs during a heart attack?

Accepted Answer

The heart and arm are innervated by the same spinal segments, causing the brain to misinterpret the source of pain.

Question 18

Which of the following is a characteristic of tonic receptors?

Accepted Answer

They show little peripheral adaptation and are slow-adapting.

Question 19

Which of the following best describes the role of the basal nuclei in motor control?

Accepted Answer

They provide the general pattern and rhythm for movements and regulate muscle tone.

Question 20

A patient is unable to abduct their eye laterally. Which cranial nerve is most likely damaged?

Accepted Answer

Abducens nerve (VI)

Spinal Cord, Nerves, Reflexes, and Brain: Structure and Function

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