Gamma efferent discharge is NOT controlled by:

Correct Answer: C

Rationale: Gamma efferents adjust muscle spindle sensitivity and are influenced by higher centers (behavior, A; anxiety, B) and descending tracts (extrapyramidal, D). Scratching (C) is a motor action, not a direct controller of gamma efferents. C is the correct answer.

Correct Answer: D

Rationale: Dorsal columns carry vibration (D, correct), position, and fine touch, not crude touch (A, spinothalamic), temperature (B, spinothalamic), or pain (C, spinothalamic). D is correct.

Correct Answer: C

Rationale: Alpha waves are occipital (not temporal, A), beta waves are fast (not slow, B), theta waves are 4-7 Hz (C, correct), and EEG aids but isn’t 100% diagnostic (D). C is correct.

Correct Answer: B

Rationale: The embryonic brain forms three primary vesicles: prosencephalon, mesencephalon, and rhombencephalon. The prosencephalon divides into telencephalon and diencephalon, and the rhombencephalon into metencephalon and myelencephalon. The mesencephalon (B) remains undivided as the midbrain. B is correct.

Correct Answer: B

Rationale: Brodmann’s areas map the cerebral cortex (B) to functions (e.g., area 4 for motor, 17 for vision). The cerebellum (A) has no Brodmann areas, basal forebrain (C) is subcortical, and corpus callosum (D) is white matter. B is correct.