Flashcards in oral cavity Deck (22):
Borders of the oral vestibule
Ant: Lips which makes up the Rima oris
Post: Teeth and alviolar processes covered by Giniva
Gums: the mucous layer or membrane which covers the alivolar processes and is firmly attached to the bone
- it reflects onto the lips and cheeks making up the fornix
movable mucous membrane
connection of the oral vestibule
- upper lip is connected to nasal cavity via Nasolabial folds and philtrum
-lower lip connects to chin at mentolabial fold
-connect to eachother laterally
-ducts of small salivarygland open into vestibule
-Connection between oral vestibule and oral cavity proper behind the 3d Molars when mouth is closed
which structures can be identified in the oral vestibule
-Maxillary/mandibular alviolar processes
-Frenulum of lover and upper lip
Borders of oral cavity proper
-Laterally and anteriorly: Teeth, alviolarprocesses+gingiva
-Post: Isthmus of faucet
-Roof: -hart and soft palate
-Floor: Oral diaphragm
(-The 2 geniohyoid muscles lies on top of the oral diaphragm and is also considered part of the floor)
-What separates the oral cavity from the nasal cavity?
-Where does the parotid duct open ?
-parotid pappilla in back of oral cavity.
What makes up the oral diaphragm?
-Mylohyoid muscle + the rape
Give the borders of the Isthmus of faucet
Sup: soft palate
Inf: root of tongue
Lat: Palatoglossal and palatopharyngeal arches
(ant and post: palatine arches + muscles of same name)
Parts of the tongue
Divisions of the anterior surface of the tongue
-Pars pappillaris: ant. 2/3s of the tongue In oral cavity =>presulcal part
contains all papillae and has a median sulcus which divides into R&L.
-Pars follicularis: post. 1/3d of tongue in oropharynx. =>postulcal part. contains lingual tonsil, see loads of lingual follicles (lymphoid nodules)
-Terminal sulcus: divides into pre and post sulcal
V-shapes line of circumvallate papillae with the foramen cecum in middle.
Which structures can you find on the inferior surface of the tongue?
-Frenulum of tongue
-Fimbriated folds-> conceals sublingual glands
-Lingual vein just below fimb. folds
-Sublingual folds with..
-.. sublingual caruncle: opening of sublingual and sub mandibular glands
-A submucosal elevation caused by a small sublingial gland on each side at the apex
Borders of Lateral lingual groove
lateral: mylohyoid muscle
superior: sublingual mucous membrane
Content of lateral lingual groove
-Hypoglossal n (more posteriorly)
-Sublingual gland (only anteriorly)
-(+ lingual vein?)
Medial lingual groove
Medial: Genioglossus mucle
Lateral: Hyoglosus muscle
-Glossopharyngeal n (not totally)
-Lies in submandubular triangle
Sup: hypoglossal n
Ant: Post. margin of mylohyoid muscle
Post: Stylohyoid/post. belly of digastric m
-Lies in Submental triangle of neck
-Superior: Tendon of post belly of digastric
-Inferior: Greater horn of hyoid bone
Posterior: Free margin of Hyoglosu Muscle
Which are the intrinsic muscle of the tongue?
which are the extrinsic muscles of the tongue
innervation of the muscles of the tongue
They're all innervated by Hypoglossal nerve, except for Palatoglossus which is innervated by the pharyngeal plexus.
-From mental spine of mandible, (from the superior genial tubercles of the mental symphysis)
-Fans out :
(a)Lowest fibres are attached to the body of hyoid bone;
(b) Intermediate fibres pass deep to the hyoglossus and are continuous with the middle constrictor muscle of pharynx;
(c) Upper fibres turn forward and upward and are inserted into the tongue extending from the root to its apex.
Function: Move tongue forward => protraction by inf. fibers + Depression by anterior fibers.