The dermatome supplying the great toe is usually

Correct Answer: C

Rationale: The great toe is supplied by the L5 dermatome, covering the lateral leg and dorsal foot. L4 supplies the medial foot, and S1 the lateral foot.

Correct Answer: B

Rationale: The infraorbital nerve is a maxillary (V2) branch, not ophthalmic (V1). Lacrimal, supraorbital, and infratrochlear are V1 branches.

Correct Answer: D

Rationale: Damage to Broca’s area (frontal lobe) causes motor (expressive) aphasia. It’s typically left-sided regardless of handedness, anterior, and Wernicke’s handles comprehension.

Correct Answer: C

Rationale: Superior cerebral veins lie in the subarachnoid space (arachnoid mater), draining into the superior sagittal sinus.

Correct Answer: D

Rationale: Neurons communicate electrically within the cell (via action potentials) and chemically between cells (via neurotransmitters at synapses). 'Radio-wave-like impulses' is incorrect, so 'A and B' is the accurate choice.