Which layer of connective tissue of nerve covers the individual fiber?

Correct Answer: D

Rationale: Individual nerve fibers (axons) are covered by endoneurium, not listed here. Perineurium (A) surrounds fascicles, epineurium (C) encases the entire nerve, and pericardium (B) is unrelated (heart tissue). Thus, 'none of the above' (D) is correct.

Correct Answer: B

Rationale: Pain is transmitted via the lateral spinothalamic tract (B), not posterior columns (A, which carry vibration/position), nor the 9th cranial nerve (C, glossopharyngeal, mainly taste/pharynx). Perception involves the cortex, but not 'only' there (D). B is correct.

Correct Answer: C

Rationale: Bitemporal hemianopia results from optic chiasm compression, commonly by pituitary tumors (C). Optic nerve lesions (A) cause unilateral loss, optic tract (B) causes homonymous hemianopia, and occipital lesions (D) affect cortical vision. C is correct.

Correct Answer: A

Rationale: Adaptation involves receptor fatigue (A, correct) or central inhibition. Rates vary (not B), Na+ channel inactivation (C) is partial, and inhibitory transmitters (D) are secondary. A is most accurate.

Correct Answer: D

Rationale: Vestibular system affects balance, not muscle tone directly (A). Semicircular canals detect angular acceleration (not linear, B), utricle detects linear (not rotational, C). Damage causes vertigo (D, correct). D is true.