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ANATOMY OFORAL CAVITY
By: Ameerhamza
S B
7th Term
SIMS,
Shimoga
THE ORAL CAVITY IS CONVENIENTLY DIVIDED BY THE ARCH FORMED BY THE TEETH AND GUMS
INTO:
1. Oral Vestibule- lies between the gums and the teeth.
2. Oral Cavity Proper- lies behind and within the arch of teeth.
Oral VestibuleBoundaries:1. Anteriorly by the lips,2. Laterally by the cheeks,3. Superiorly by the
mucolabial and mucobuccal folds, and
4. Posteriorly and medially by the teeth and gums.
THE ORAL CAVITY PROPERBoundaries:1. Anteriorly and laterally by
the teeth and gums,2. Superiorly by the palate
(hard and soft),3. Inferiorly by the tongue and
the floor of the mouth, and4. Posteriorly by the opening
into the pharynx.
THE SUBLINGUAL REGION
Characteristics:
1. Anterior 2/3 of the tongue,
2. Lingual frenulum,3. Lingual vein,4. Sublingual caruncle,5. Sublingual folds6. Fimbriated fold
BLOOD SUPPLY
Mouth is supplied by branches from Facial Artery Inferior Alveolar Artery Maxillary Artery Infraorbital Artery Postero superior alveolar
arteries
Lymphatic Supply
PALATE
The palate forms the superior wall or the roof of the oral cavity proper.
It is composed of the hard palate which has an osseous base, and behind, a soft palate composed of fibrous tissue.
SOFT PALATE
Tensor veli palatini
Tenses the soft palate; opens the pharyngotympanic tube
Levator veli palatini
Only muscle to elevate the soft palate above the neutral position
PalatopharyngeusDepresses soft palate; moves palatopharyngeal arch toward midline; elevates pharynx
Palatoglossus Depresses palate; moves palatoglossal arch toward midline; elevates back of the tongue
Musculus uvulaeElevates and retracts uvula; thickens central region of soft palate
MUSLE FUNCTION
A. Tensor veli palatini muscles and the palatine aponeurosis. B. Levator veli palatini muscles. C. Palatopharyngeus muscles
Blood supply of Soft palate
VENOUS DRAINAGE AND LYMPHATICS
NERVE SUPPLY OF PALATE
•All muscles of soft palate are supplied by Vagus nerve [X] via pharyngeal branch to pharyngeal plexus•Except Tensor palatini muscle which is supplied by Mandibular nerve.• Sensory supply is derived from lesser palatine branches of the sphenopalatine ganaglion and from the branches of glossopharyngeal nerve.• Secretomotor from Suprior salivary N. through greater petrosal nerve
tongue“A mobile mass of muscles lying on the floor of the mouth and associated with the function of taste, chewing, swallowing, and speaking”.TONGUE CONSISTS OF• Mucous membrane• Mucous glands• Lymphoid tissue• Fat• Striated muscle fibres• Fibrous tissue
PAPILLAE
Circumvallate papillae are arranged in a row parallel to and in front of sulcus terminalis Fungiform papillae are numerous at the tip and margin of the tongue. Filliform papillae are prevalent on the dorsum of the tongue arranged in rows parallel to sulcus terminalis
Muscles of the tongue
INTRINSIC MUSCLESMUSCLE FUNCTION
SUPERIOR Shortens tongue; curls apex and sides of tongue
INFERIOR Shortens tongue; uncurls apex and turns it downward
TRANSVERSE Narrows and elongates tongue
VERTICAL Flattens and widens tongue All intrinsic muscles are supplied by
Hypoglossal nerve
EXTRINSIC MUSCLES
GENIOGLOSSUS
Protrudes tongue; depresses center of tongue
HYOGLOSSUS
Depresses tongue
STYLOGLOSSUS
Elevates and retracts tongue
PALATOGLOSSUS
Depresses palate; Moves palatoglossal fold toward midline; Elevates back of the tongue
Blood Supply Arteries:
Lingual artery Tonsillar branch of facial
artery Ascending pharyngeal artery
Veins: Lingual vein, ultimately
drains into the internal jugular vein
Hypoglossal nerve
Lingual artery &
vein
Deep lingual
vein
Dorsal lingual artery & vein
BLOOD AND NERVE SUPPLY
Lymphatic Drainage Tip:
• Submental nodes bilaterally & then deep cervical nodes
Anterior two third:• Submandibular
unilaterally & then deep cervical nodes
Posterior third:• Deep cervical nodes
(jugulodigastric mainly)
NERVE SUPPLY OF TONGUE
REFERENCE
Textbook of Ear, Nose, Throat and Head & Neck Surgery Clinical and Practical
3rd Edition By : P. Hazarika , D.R . Nayak, R. Balakrishnan Gray’s Anatomy for Students 2nd edition By : Richard L Drake , A Wayne Vogl , Adam W M Mitchell
THANK YOU