Question 1

Which of the following best describes the organization of white and gray matter in the spinal cord?

Accepted Answer

White matter surrounds the gray matter, which is centrally located.

Question 2

A patient touches a hot stove and immediately withdraws their hand. Which reflex is primarily responsible for this action, and what is a key feature of its neural circuit?

Accepted Answer

Withdrawal (flexor) reflex; includes inhibitory interneurons that suppress extensor muscles.

Question 3

Which of the following correctly traces the somatic motor pathway from the spinal cord to the brachioradialis muscle?

Accepted Answer

Upper motor neuron in the cerebral cortex → lower motor neuron in the anterior horn → brachioradialis muscle

Question 4

Which of the following is NOT a component of a typical reflex arc?

Accepted Answer

Cerebral cortex

Question 5

The posterior column pathway carries which type of sensory information, and to which part of the brain does it project?

Accepted Answer

Fine touch, vibration, and proprioception; primary somatosensory cortex

Question 6

Which equation best represents the relationship between the number of spinal nerves ($$N$$), cervical nerves ($$C$$), thoracic nerves ($$T$$), lumbar nerves ($$L$$), sacral nerves ($$S$$), and coccygeal nerves ($$Co$$)?

Accepted Answer

$$N = C + T + L + S + Co$$

Question 7

A patient reports pain in their left arm during a heart attack. This phenomenon is best described as:

Accepted Answer

Referred pain, due to convergence of visceral and somatic sensory pathways in the spinal cord.

Question 8

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

Accepted Answer

Transmits pain, temperature, and crude touch sensations to the thalamus.

Question 9

Which of the following is the correct order of neurons in a typical sensory pathway to the CNS?

Accepted Answer

First-order neuron → second-order neuron → third-order neuron

Question 10

During the 'fight or flight' response, which division of the autonomic nervous system is primarily activated, and what is a typical physiological effect?

Accepted Answer

Sympathetic division; increased heart rate and pupil dilation

Question 11

Which of the following best describes the pathway of a visceral motor impulse from the spinal cord to a sweat gland on the back?

Accepted Answer

Preganglionic neuron in the lateral horn → sympathetic chain ganglion → postganglionic neuron → sweat gland

Question 12

Which equation correctly represents the total number of synapses ($$S) in a $$three-neuron sensory pathway, if each neuron synapses with only one other neuron?

Accepted Answer

$$S = 2$$

Question 13

Which of the following is a key difference between somatic motor and visceral motor pathways?

Accepted Answer

Somatic motor pathways directly innervate skeletal muscle, while visceral motor pathways involve a ganglion and target smooth muscle, cardiac muscle, or glands.

Question 14

Which of the following best describes the function of the crossed extensor reflex?

Accepted Answer

It stimulates flexor muscles on one side and extensor muscles on the opposite side to maintain balance.

Question 15

Which pathway carries proprioceptive information to the cerebellum?

Accepted Answer

Spinocerebellar pathway

Question 16

Which of the following is the correct sequence for a sensory pathway from a fingertip to the spinal cord?

Accepted Answer

Sensory receptor in fingertip → first-order neuron → dorsal root ganglion → posterior horn of spinal cord

Question 17

Which of the following best describes the effectors of the autonomic nervous system (ANS)?

Accepted Answer

Smooth muscle, cardiac muscle, and glands

Question 18

Which of the following is a function of the parasympathetic division of the ANS?

Accepted Answer

Promotes 'rest and repose' by stimulating digestive activity and reducing heart rate

Question 19

Which of the following best describes the role of autonomic ganglia in the ANS?

Accepted Answer

They are sites where preganglionic neurons synapse with postganglionic neurons.

Spinal Cord, Neural Integration, and Autonomic Nervous System: Study Guide

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