Oral Cavity Flashcards
Vermillion Zone
transitional zone of red tissue that lies between the skin and mucous membrane of the lip
cause of red color of vermillion zone
rich capillary ned underlying-unkeratinized epithelium
Sensory innervation of ant 2/3 of the tongue
tastedbuds on ant. 2/3 is innervated by lingual nerve (GSA-general somatic afferent) and chorda tympani supplies SVA-special visceral afferent
Sensory innervation of post 2/3 of tongue
GVA and SVA fibers by glossopharyngeal n.
motor innervation to all extrinsic and intrinsic muscles of tongue
hypoglossal nerve (CN12) all except the palatoglossal which recieves vagus nerve (CN10)
Lingual artery arises from
external carotid artery at greater horn of hyoid bone
muscle lingual artery runs to
post border of hypoglossus m. and to medial surface of hypoglossus m.; in the m. artery turns vertical to tip of tongue
Branches of lingual artery (veins same)
o Hyoid branch – supplies the muscles attached to the hyoid bone
o Dorsal lingual arteries – supply blood to the posterior 1/3 of tongue
o Sublingual artery – supplies sublingual gland and mylohyoid muscle
♣ Anastomoses with the submental artery (branch of the facial artery)
o After giving off the sublingual artery, the lingual artery enters the body of the tongue and is now called the deep lingual artery
Boundaries of oral cavity
lips-ant cheeks-lat palate-sup muscular floor-inf ant pillars of fauces-post
subdivisions of oral cavity
oral vestibule and oral cavity proper
oral vestibule bounaries
- between lips-ant and cheeks-lat (buccinator=post/lat)
- dental arches form internal border
oral cavity proper boundaries
lingual surface of teeth/gingiva, palate and floor, ant pillar of fauces
labial commisure
corners of the mouth/lips
oral fissure
split between the lips
vermillion border
vermillion zone and skin junction-wet dry line
