with regard to myotomal nerve supply

Correct Answer: D

Rationale: Elbow extension (triceps) is a C7-C8 myotome. Opponens pollicis is C8-T1, shoulder abduction is C5-C6, and plantar flexion is S1-S2.

Correct Answer: D

Rationale: The trochlear nerve (CN IV) supplies the superior oblique muscle, enabling downward/outward eye movement.

Correct Answer: C

Rationale: The infratrochlear nerve (V1) supplies sensation to the bridge of the nose and medial eyelid.

Correct Answer: A

Rationale: The trigeminal nerve (CN V) supplies the temporalis (V3 motor). The external nasal is V1, earlobe is C2-C3, and occiput is C2.

Correct Answer: C

Rationale: The neuron is the basic functional unit of the nervous system, responsible for transmitting signals. Glial cells support neurons, meninges protect the CNS, and cerebrospinal fluid cushions it, but only neurons conduct electrical impulses.