Oral Cavity The cavity that extends from lips to pharynx & contains the tongue & teeth2 parts:1. Vestibule: space between ? contains ? divides into sulci: labial & buccal2. Oral cavity proper: enclosed by teeth* The vestibule communicates with cavity proper at: 1. ?? & 2. ??
Oral Cavity ProperSpace that enclosed by teeth & bounded:Roof: hard palateFloor: reflection of M.M. under the tongueAnt.: communicates with VestibulePost.: communicates with oropharynx
Openings2 openings:Oral fissure: from vestibule to outsideOropharyngeal opening (isthmus): from cavity proper to oropharynx
Teeth 2 sets1. 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)
The Tongue A muscular organ that covered with mucous memb.DividesOral part: ant. 2/3Pharyngeal part: post. 1/3Surfaces:Palatal (dorsal)Tip & margins (opposite?)Lower surface (ventral, opposite?)Root: connects tongue to ??
Dorsum 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 types filiform smallest & numerous fungiform tip & margins vallate 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 TongueCovered by smooth & thin m.m.1. Frenulum: fold of m.m. connects …2. Deep ling. Artery & vein from??3. Fimberiated fold
Muscles of The tongue 2 typesIntrinsic: not attached to bone 3 directions: longi., transv., & vertical innervation? Action: change tongue shapeExtrinsic: 4 (5?) muscles
Innervation to The TongueSensory: general: Ant. 2/3 ? Post. 1/3 ? Special: Ant. 2/3 ? Post. 1/3 ?Motor: ??
Arterial Blood Supply to The TongueLingual a.: from?? pass deep to hyoglossus m. Branches: 3?Tonsillar a. from ?Ascending pharyngeal a.
Genioglossus & Airway PatencyGenioglossus m. is under constant state of contraction, to prevent the tongue from collapsing posteriorly & obstructing airway.- Hypercontraction = ??* When the pt. is deeply anesthetizedgenioglossus may relaxed &The base of the tonguemoves posteriorly
Submandibular Salivary GlandMixed gland (mucous & serous, mainly ?)Rests on post. Border of ??2 parts: large superficial small deep* Relations to superficial & deep parts:
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 GlandMixed gland (mainly ?)Beneath m.m. of floor of mouthOpens into the floor of mouth: 8-20 ducts (subling. Fold)* Relations to the gland: