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
Philtrum and nasolabial groove
midline groove from nose to base of lips runs into the nasolabial groove
wet dry line
vermillion zone
labiomental groove
seperates the chin from lower lip
placement of labial commisure
canine/first premolar
buccinator origin and insertion
O: pterygomandibular raphe
I: orbicularis oris m.
Mucous membrane of the cheeks
Buccal mucosa; fixed to buccinator
Calculus formation at max 1st and 2nd molars
saliva exposure; commonly from the parotid duct
location of buccal fat pad
between the masseter and buccinator
dark red gingiva
alveolar
pink (lighter)
attached
junction of attached and alveolar gingiva
mucogingival junction
Frena
tendinish lines which attach the gingiva; 3 on each arch; one central (labial fold) and two near pre molars (buccal)
labial vestibule boundaries
upper and lower lips and dental arch, right and left buccal frena
Maxillary buccal vestibule location
buccal frenum to hamular notch
mandibular buccal vestibule location
buccal frenum to retromolar fossa
fovea palatinae
duct opening which lets mucouse out, beware not to cover in restoration
hamular notch
depression between maxillary tuberosity and the pterygoid plates, hamulus
pterygomandibular raphe
pterygoid hamulus –> retromolar triangle/retromolar pad
buccal shelf
between ext oblique ridge and alveolar crest, site for denture support
narrowed when the mouth is open wide
buccal shelf-narrowed by the coronoid process
firm, fixed, somewhat compressible tissue with underlying glands
hard palate
palatal rugae
transvers ridges at ant aspect
movable tissue in mouth which seperates the oral cavity from nasopharynx in speech and swallowing
soft palate; laughter relaxes –> water out nose while laughing
