the oral cavity & salivary glands

The Oral Cavity & Salivary The Oral Cavity & Salivary GlandsGlands

Oral CavityOral Cavity

The cavity that extends from lips to pharynx & contains the tongue & teeth

2 parts:

1. Vestibule:

space between ?

contains ?

divides into sulci: labial & buccal

2. Oral cavity proper:

enclosed by teeth

* The vestibule communicates with cavity proper at: 1. ?? & 2. ??

Oral Cavity ProperOral Cavity Proper

Space that enclosed by teeth & bounded:

Roof: hard palate

Floor: reflection of M.M. under the tongue

Ant.: communicates with Vestibule

Post.: communicates with oropharynx

OpeningsOpenings

2 openings:

Oral fissure:

from vestibule to outside

Oropharyngeal opening (isthmus):

from cavity proper to oropharynx

TeethTeeth

2 sets

1. Deciduous (primary) teeth:

5 in each quadrant (?)

start eruption ~ 6m

fully erupted ~ ??

1st primary tooth to erupt is ?

2. Permanent teeth:

8 in each quadrant (?)

Start eruption ~ ??

Fully erupted ~ 12 y (Except?)

*3rd molar = wisdom tooth

(because it erupts at older age)

Innervation of The TeethInnervation of The Teeth

GingivaeGingivae TeethTeeth

The TongueThe TongueA muscular organ that covered with mucous memb.

DividesOral part: ant. 2/3Pharyngeal part: post. 1/3

Surfaces:Palatal (dorsal)Tip & margins (opposite?)Lower surface (ventral, opposite?)Root:

connects tongue to ??

Dorsum of The TongueDorsum of The TongueMedian fissure

fibrous septumSulcus terminalis:

V-shaped ridge, separates?Foramen cecum: (blind opening)

at apex of sulcus term.marks the site of ?

Lingual papillae: 4 typesfiliform

smallest & numerous fungiform

tip & marginsvallate

8-12, in front of ?foliate

linear folds, on the sides

near terminal sulcus

Lingual Tonsil:

aggregation of L. nodules

on post. 1/3 of the tongue

part of Waldeyer’s ring

(4 kinds of tonsils)

Ventral Surface of The TongueVentral Surface of The Tongue

Covered by smooth & thin m.m.

1. Frenulum:

fold of m.m. connects …

2. Deep ling. Artery & vein

from??

3. Fimberiated fold

Muscles of The tongueMuscles of The tongue

2 typesIntrinsic:

not attached to bone

3 directions:

longi., transv., & vertical

innervation?

Action:

change tongue shape

Extrinsic:

4 (5?) muscles

Innervation to The TongueInnervation to The Tongue

Sensory:

general: Ant. 2/3 ?

Post. 1/3 ?

Special: Ant. 2/3 ?

Post. 1/3 ?

Motor: ??

Arterial Blood Supply to The TongueArterial Blood Supply to The Tongue

Lingual a.:

from??

pass deep to hyoglossus m.

Branches: 3?

Tonsillar a.

from ?

Ascending pharyngeal a.

Lymph DrainageLymph Drainage

Tip:

submental L.N.

Lat. Ant. 2/3:

submandibular L.N.

Medial Ant. 2/3:

DCLN

Post. 1/3:

DCLN

Genioglossus & Airway PatencyGenioglossus & Airway Patency

Genioglossus m. is under constant state of contraction, to prevent the tongue from collapsing posteriorly & obstructing airway.

- Hypercontraction = ??

* When the pt. is deeply

anesthetized

genioglossus may relaxed &

The base of the tongue

moves posteriorly

Submandibular Salivary GlandSubmandibular Salivary Gland

Mixed gland (mucous & serous, mainly ?)

Rests on post. Border of ??

2 parts: large superficial

small deep

* Relations to superficial & deep parts:

Submandibular duct (Warton’s)Submandibular duct (Warton’s)

same length as parotid duct

(~ 5cm)

arises from deep part of the gland

pass ant.

opens beside the frenulum

(sublingual papilla)

Sublingual Salivary GlandSublingual Salivary Gland

Mixed gland (mainly ?)

Beneath m.m. of floor of mouth

Opens into the floor of mouth:

8-20 ducts (subling. Fold)

* Relations to the gland: