These are two fleshy folds that circumscribe the mouth and closes the cavity. At the sides they unite to form the oral commisures 5 LAYERS1. Skin – contains hair follicles and sebaceous glands2. Superficial Fascia- contains some fats3. Orbicularis Oris muscle – serves as sphincter of the mouth4. Submucous tissue – contains vessels, mucous labial glands and labial branches of facial artery5. Mucous membrane – innermost layer
Oral Cavity Oral Vestibule Proper
Boundaries:1. Anteriorly by lips2. Laterally by cheeks3. Posteriorly and medially by teeth and gums
Boundaries:1. Anteriorly laterally by teeth and gums2. Superiorly by the palate3. Inferiorly by the tongue and the floor of the mouth4. Posteriorly by opening into the pharynx
Lingual frenulum (connects the tongue to the floor of the mouth) Sublingual fold (passes lateraly and backwards from the papilla and overlies the sublingualPapillae ( openings gland)of submandibularduct)Each sublingual compartment contains submandibulargland and dcuts, lingual and hypoglossal nerve and the siblingul vessels.
Smallest salivary gland Indicated by the sublingual fold, found between the alveolus and anteiror part of the tongue Lesser sublingual duct (Rivini’s ducts) – opens into the floor of the mouth Greater sublingual duct (Bartholin’s ducts) opens on the sublingual caruncle
Located at the submandibular fossa below mylohyoid muscle. Submandibular duct (Wharton’s ducts) – opens at the sublingual papillae
Consists of dense vascular fibrous tissue which is covered by mucuos membrane and attached to the alveolar margins of the jaws.
o Covered by mucous membrne and forms a partition between the oral and the nasal cavity Media n rapheo The mucous membrane and the periosteum cannot be separated (mucoperiosteum)
Movable portion and is attached to the hard palatePalatine tonsil is also called “Isthmus of Fauces” or the TonsilarSinus
Levator Palatini – brings soft palate in contact with posterior pharyngeal wall, preventing food from going upward ino the nasopharynx Tensor Palatini – tenses the soft palate Palatoglossus – raises the tongue Uvulae muscle – raises the uvula
Mobile mass of muscles lying on the floor of the mouth and associated with functions of taste, chweing, swallowing and speaking
PAPILLAE OF THE TONGUE TASTE DISTRIBUTION
a. Extrinsic muscles responsible for changing the position of the tongue a. Gionioglossus b. Geniohyoidb. Intrinisic muscles change the shape of the tonguea. Superior longitudinal musclesb. Inferior longitudinal musclesc. Transverse muslced. Vertical muscles