Anatomy of oral cavity .pptx

Anatomy of oral cavity

1. PREETHI G ROLL NO.68 S4 UNIT ANATOMY OF ORAL CAVITY

2. The oral cavity extends from the lips to the oropharyngeal isthmus, i. e . u p t o the l e v el o f a n terior pill ar o f to n sil s.

3. Lips The lip starts at the junction of facial skin and vermillion border and ends at the point where the upper and lower lips meet when the mouth is closed.

4. The p h i l trum i s t h e shal l o w v e r t i cal g r o o v e seen i n t h e m i dl i ne on t h e ou t er surface of t h e u p pe r l i p . Me d ia n f olds of m ucou s mem b rane t h e labi al f r e n u l a e , conn ect t h e i n ne r surface of t h e l i ps to t h e gums.

5. Blood supply The facial artery: 1.The superior labial artery : (the upper lip) 2 . In f er i o r la b ial a r te r y: ( t h e l o w er l i p ) These arteries anastomose with each other to form an a r ter i al ri n g.

6. • The buccal mucos a extends from the inner surfaces of the upper and lower lips to the labial aspect of the maxilla and mandible • T h e i n ne r surface of each li p i s conn ected in the middle line to the corresponding gum by a f old of m ucou s mem b ra n e , t h e la b ia l f r e n u l um. • The r et r o c om m issur a l r egion i s s i t uated be t w een t h e la b ia l commi s s u r e and t h e opening of Stensen’s duct (the drainage duct of t h e pa r ot i d gland) CHEEK MUCOSA

7. Blood supply 1. The angular artery, a terminal branch of the facial artery (the superior part of the cheek). 2. The maxillary artery is the larger (the cheek mucosa, teeth, gingivae, and palate)

8. Gums and alveolar process: The alveolus and the accompanying gingiva extend from gingivobuccal sulcus laterally to the floor of mouth and hard palate and make up the dental surface of maxilla andmandible Retromolar trigone : The retromolar trigone is the region defined by ascending ramus of mandible starting on each side just prior to the last molar tooth and ending adjacent to the tuberosity of maxilla

9. T eeth

10. Hard palate A: transverse rugae of hard palate; B: median raphe of hard palate; C: median raphe of soft palate. The hard palate is the area medial to the maxillary alveolar ridges and extends posteriorly to the soft palate [part of oropharynx] The hard palate form the roof of the mouth separating mouth from the nose Deep to the mucosal lining , th e hard palate is formed by palantine process of the maxillary bone and palantine bone.

11. T ong u e • Only anterior two-thirds of tongue are included in t h e or a l c a vit y . • Oral tongue is divided into tip, lateral borders, dor s um and t h e u n der surfac e . • The mucous membrane of the upper surface of the tongue can be divided into anterior and posterior parts by a V-shaped sulcus , the sulcus terminalis . • The apex of the sulcus projects backward and is mar k ed b y a small p i t, t h e f orame n ce c um . • Three types of papillae are present on the upper surfa ce o f t he a n ter i or t w o t h i r ds o f t he t o n g u e : the filiform papillae, the fungiform papillae, and the vallate papillae.

12. • In the m idlin e anterior l y , t he undersurface of the tongue is connected to the floor of the mouth by a fold of mucous membrane, the f r e n ulum o f the tongu e .

13. • Ne r v e s u p p l y: Hy p oglos s al ne r v e • Blood su p p l y : T h e l i ngual a r te r y , t h e ton s i l lar bran ch of t h e facial a r te r y , and t h e asc e n d i ng p h a r y n g eal a r te r y su p p ly t h e tongu e . T h e v ei n s dr a i n i n to t h e i n ternal j u gular v ei n .

14. Floor of mouth The floor of the mouth extends from the lingual surface of the mandible to the ventral tongue anteriorly, and to the glossotonsillar sulcus posteriorly. The right and left sides are separated by lingual frenulum.

15. Summa r y • Oral cavity divided into vestibule and cavity proper. • Blood is supplied to the oral vestibule and oral cavity via branches of t h e ex t ernal ca r o t i d a r t e r y (f a cial, maxilla r y , and li n gual ) . • All of the lingual veins terminate, directly or indirectly, in the internal jugula r v ein • All lymphatics from the head and neck drain directly or indirectly into t h e deep ce r vical l ym p h nod es.