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Flashcards in oral cavity Deck (22):
1

Borders of the oral vestibule

Ant: Lips which makes up the Rima oris
Post: Teeth and alviolar processes covered by Giniva
Lat: Cheeks

2

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

3

fornix

movable mucous membrane

4

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

5

which structures can be identified in the oral vestibule

-Maxillary/mandibular alviolar processes
-Frenulum of lover and upper lip
-intadental gingiva
-Fornix

6

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)

7

-What separates the oral cavity from the nasal cavity?
-Where does the parotid duct open ?

-The palate
-parotid pappilla in back of oral cavity.

8

What makes up the oral diaphragm?

-Mylohyoid muscle + the rape

9

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)

10

Parts of the tongue

-Apex
-Base
-Root
-Body
-Dorum
-Inferior surface

11

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.
-

12

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

13

Borders of Lateral lingual groove

Borders:
medial: hypoglossus
lateral: mylohyoid muscle
superior: sublingual mucous membrane

14

Content of lateral lingual groove

-Lingual n
-Hypoglossal n (more posteriorly)
-submandibular duct
-(sublingual duct?)
-Sublingual gland (only anteriorly)
-(+ lingual vein?)

15

Medial lingual groove

Borders:
Medial: Genioglossus mucle
Lateral: Hyoglosus muscle
Content:
-Lingual a.
-Glossopharyngeal n (not totally)

16

Pirogoffs trigone

-Lies in submandubular triangle
Borders:
Sup: hypoglossal n
Ant: Post. margin of mylohyoid muscle
Post: Stylohyoid/post. belly of digastric m

17

Beclards trigone

-Lies in Submental triangle of neck
Borders:
-Superior: Tendon of post belly of digastric
-Inferior: Greater horn of hyoid bone
Posterior: Free margin of Hyoglosu Muscle

18

Which are the intrinsic muscle of the tongue?

-Superior longitudinal
-Transversus
-Verticalis
-Inferior longitudinal

19

which are the extrinsic muscles of the tongue

-Genioglossus
-Hyoglossus
-Styloglossus
-Palatoglossus

20

innervation of the muscles of the tongue

They're all innervated by Hypoglossal nerve, except for Palatoglossus which is innervated by the pharyngeal plexus.

21

Genioglossus:

-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.

22

Hyoglossus

-From greater horn of hyoid bone
to lateral side and inferior surface of the tongue.

Function: Depreses and retracts tongue