The lumbar plexus

Correct Answer: D

Rationale: The lumbar plexus (L1-L4) forms the femoral nerve from L2-L3-L4, innervating thigh muscles. It’s lateral to the inferior vena cava, formed from anterior rami, and includes more than the last three lumbar nerves.

Correct Answer: D

Rationale: Corneal sensation (via ophthalmic nerve, V1) synapses in the trigeminal ganglion, the sensory root of CN V.

Correct Answer: C

Rationale: The cervical sympathetic trunk lies behind the carotid sheath, ascending along the neck to the superior cervical ganglion.

Correct Answer: D

Rationale: Corneal sensation (V1) synapses in the trigeminal ganglion (option e), the sensory root of CN V.

Correct Answer: D

Rationale: The ophthalmic division (V1) gives branches like lacrimal and supraorbital, some with sympathetic fibers, entering via the superior orbital fissure.