Question

Secretion of tears via lacrimal gland done by?

(a) Facial nerve (CN VII)
(b) Trigeminal nerve (CN V)
(c) Glossopharyngeal nerve (CN IX)
(d) Lacrimal nerve (branch of ophthalmic division of CN V)

Answer 1

Tear secretion by the lacrimal gland is controlled by the Facial nerve (CN VII), specifically, its parasympathetic fibers that synapse in the pterygopalatine ganglion. This is part of the diverse functions the facial nerve performs.

Step-by-step explanation:

The secretion of tears via the lacrimal gland is controlled by the Facial nerve (CN VII). The facial nerve is responsible for carrying preganglionic parasympathetic fibers that synapse in the pterygopalatine ganglion. The parasympathetic output of the facial nerve then stimulates the lacrimal gland to produce tears, which wash over the eye's surface to remove irritants and keep it moist. This process is part of the broader role that the facial nerve plays in managing various facial expressions as well as the initiation of salivation, showcasing its diverse range of functions in facial and oral activities.

Answer 2

The secretion of tears is controlled by the Facial nerve (CN VII), where parasympathetic fibers from this nerve synapse in the pterygopalatine ganglion, then stimulate the lacrimal gland.

Step-by-step explanation:

The secretion of tears by the lacrimal gland is predominantly controlled by the Facial nerve (CN VII). Specifically, the lacrimal gland is innervated by the parasympathetic fibers that originate from the facial nerve. These preganglionic parasympathetic fibers synapse in the pterygopalatine ganglion, and the postganglionic fibers proceed to the lacrimal gland stimulating tear production. This secretion process is an automatic response that is part of the body's parasympathetic nervous system, which manages bodily functions during restful states.