Q: Which of the following equations correctly represents the relationship between the number of spinal nerve pairs and the number of spinal cord segments?

$$\text{Number of spinal nerve pairs} = 31$$

Question 1

Which embryonic germ layer gives rise to the nervous system, and what is the process by which the neural tube forms?

Accepted Answer

The ectoderm; the neural plate folds inward to form the neural groove, which converges to form the neural tube.

Question 2

A patient presents with difficulty initiating voluntary movements, muscle rigidity, and postural imbalance. Which neural pathway and neurotransmitter are most likely affected?

Accepted Answer

Direct pathway; dopamine

Question 3

Which structure is responsible for conscious perception of tactile sensations such as touch, pain, and proprioception, and where is it located?

Accepted Answer

Primary Somatosensory Cortex; postcentral gyrus of the parietal lobe

Question 4

Which of the following best describes the function of the basal nuclei (basal ganglia) in motor control?

Accepted Answer

They coordinate movement by both facilitating and inhibiting motor activity through direct and indirect pathways.

Question 5

A lesion in Broca’s area would most likely result in which of the following deficits?

Accepted Answer

Impaired production of speech and language

Question 6

Which cranial nerve is responsible for the sense of smell, and what is the clinical consequence of its damage?

Accepted Answer

CN I (Olfactory); anosmia

Question 7

A patient has lost the ability to shrug their shoulders and rotate their head. Which cranial nerve is most likely damaged?

Accepted Answer

CN XI (Accessory)

Question 8

Which of the following is TRUE regarding the circle of Willis?

Accepted Answer

It ensures constant perfusion of the cerebrum in the event of a blockage of one of the arteries.

Question 9

Which of the following best describes the function of the hypothalamus?

Accepted Answer

It regulates homeostasis, including autonomic control, body temperature, food and water intake, and hormone release.

Question 10

A lumbar puncture is performed to withdraw cerebrospinal fluid. Where is the needle inserted?

Accepted Answer

Into the subarachnoid space in the lumbar region inferior to the tip of the conus medullaris

Question 11

Which of the following equations correctly represents the relationship between the number of spinal nerve pairs and the number of spinal cord segments?

Accepted Answer

$$	ext{Number of spinal nerve pairs} = 31$$

Question 12

Which structure provides the major pathway for communication between the two cerebral hemispheres?

Accepted Answer

Corpus callosum

Question 13

Damage to the dorsal root ganglion of a spinal nerve would most likely result in which clinical symptom?

Accepted Answer

Loss of sensation in the corresponding dermatome

Question 14

Which of the following is a function of the cerebellum?

Accepted Answer

Coordination of skeletal muscle movements and maintenance of balance and equilibrium

Question 15

A patient presents with exaggerated, abnormal involuntary movements such as jerky or writhing motions. Which disease and neural structure are most likely involved?

Accepted Answer

Huntington's disease; striatum of the basal nuclei

Question 16

Which of the following best describes the function of the reticular formation?

Accepted Answer

It maintains cerebral cortical awareness and filters out repetitive or weak stimuli entering the brain.

Question 17

Which nerve is the largest branch of the brachial plexus and is responsible for elbow extension, forearm supination, wrist and finger extension, and thumb abduction?

Accepted Answer

Radial nerve

Question 18

Which equation correctly represents the relationship between the volume of the adult brain and its mass?

Accepted Answer

$$	ext{Volume} = 1200\ 	ext{ml}$$; $$	ext{Mass} = 3\ 	ext{lbs}$$

Question 19

Which of the following is TRUE regarding the spinal cord's gray and white matter?

Accepted Answer

Gray matter surrounds the central canal and contains neuron cell bodies, while white matter is superficial and contains myelinated axons.

Question 20

A patient is unable to flex their thigh and extend their knee. Which nerve and plexus are most likely affected?

Accepted Answer

Femoral nerve; lumbar plexus

Anatomy of the Nervous System: Embryology, Structure, and Function

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