Question

which of the following pairs is mismatched?
a sensory neuron—afferent neuron
b ganglion—knot-like mass of nerve cell bodies
c motor neuron—efferent neuron
d somatic nerves—serve the eyes and ears

Explanation:

• Option A: Sensory neurons are also called afferent neurons as they carry sensory information towards the central nervous system.
• Option B: A ganglion is indeed a knot - like mass of nerve cell bodies.
• Option C: Motor neurons are also known as efferent neurons as they carry motor commands away from the central nervous system.
• Option D: Somatic nerves mainly innervate skeletal muscles (for voluntary movement) and the skin. The nerves that serve the eyes (like the optic nerve for vision) and ears (like the vestibulocochlear nerve for hearing and balance) are cranial nerves, not somatic nerves in the traditional sense of somatic nerves innervating skeletal muscles and skin.

Answer:

D. somatic nerves—serve the eyes and ears