DMD Biomedical and Dental Sciences 2

Question 1

A patient reports numbness of the buccal gingiva adjacent to the mandibular molars only. Which nerve is most likely affected?

Accepted Answer

Long buccal nerve

Answer

The long (buccal) nerve of V3 supplies the buccal gingiva and mucosa of the mandibular molar region.

Question 2

Which suprahyoid muscle is innervated by the mandibular division of the trigeminal nerve?

Accepted Answer

Anterior belly of digastric

Answer

The anterior belly of digastric derives from the first pharyngeal arch and is supplied by the nerve to mylohyoid (V3).

Question 3

Postganglionic parasympathetic fibers that stimulate parotid secretion synapse in which ganglion?

Accepted Answer

Otic ganglion

Answer

Preganglionic fibers from CN IX travel via the lesser petrosal nerve to the otic ganglion, then reach the parotid via the auriculotemporal nerve.

Question 4

Taste sensation from the anterior two-thirds of the tongue is carried by which nerve?

Accepted Answer

Chorda tympani (CN VII)

Answer

Special taste fibers of the anterior two-thirds travel with the lingual nerve but belong to the chorda tympani of the facial nerve.

Question 5

The muscles of mastication are derived from which pharyngeal arch?

Accepted Answer

First

Answer

First-arch mesoderm forms the muscles of mastication, all innervated by V3.

DMD - Doctor of Medicine in Dentistry Practice Test