ATI RN
Test Questions on Autonomic Nervous System MCAT Questions
Question 1 of 5
Postion sense:
Correct Answer: D
Rationale: Position sense (proprioception) is tested by joint movement, not tuning fork (A, vibration). It travels via dorsal columns, not spinothalamic (B). Pyramidal lesions (C) affect motor, not sensory. Sensory ataxia (D) from dorsal column loss impairs position sense. D is correct.
Question 2 of 5
A 75 year old man gradually presented with left sided tremor especially at rest, and poverty of movement and a festinant gait. On clinical examination of this patient the following is true:
Correct Answer: B
Rationale: This describes Parkinson’s: rest tremor, bradykinesia, festinant gait, and mask-like face (B, correct). Rigidity (not hypotonia, A), normal power (not severely affected, C), and normal reflexes (not absent, D) are typical. B is correct.
Question 3 of 5
What region of the diencephalon coordinates homeostasis?
Correct Answer: C
Rationale: The hypothalamus (C) regulates homeostasis (e.g., temperature, hunger, thirst). The thalamus (A) relays sensory/motor signals, epithalamus (B) includes the pineal gland (circadian rhythms), and subthalamus (D) aids motor control. C is correct.
Question 4 of 5
Which portion of the ventricular system is found within the diencephalon?
Correct Answer: B
Rationale: The third ventricle (B) lies within the diencephalon, between the thalami. Lateral ventricles (A) are in the telencephalon, cerebral aqueduct (C) in the midbrain, and fourth ventricle (D) between pons and cerebellum. B is correct.
Question 5 of 5
Which structure predominates in the white matter of the brain?
Correct Answer: A
Rationale: White matter in the brain is primarily composed of myelinated axons, which are nerve fibers coated with myelin to speed up signal transmission. Neuronal cell bodies dominate gray matter, not white matter. Ganglia and dendrites from the enteric nervous system are not primary components of brain white matter.