The Oral Cavity

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Slide 1 :

The oral cavityand its associated structure Dr. Lorena C. Balacanao

Slide 2 :

The External Mouth Composes primarily of the upper and lower lip Separated to the skin by vermillion border Bounded Superiorly – Philtrum Supero-laterally- Naso-labial fold Inferiorly- Mento-labial fold

Slide 3 :

Parts of the External mouth Philtrum Vermillion border Mento-labial fold Naso-labial fold Angle of the mouth Oral fissure Upper lip Lower lip

Slide 4 :

Muscle that supports the external mouth is the Orbicularis Oris Muscle

Slide 5 :

Functions of mouth The first part of digestive system wherein mastication occur. It receives food (ingestion) and break up the food into smaller pieces (digestion). Takes part in respiration as well as in speech production Lastly it conveys emotion

Slide 6 :

The 2 divisions of the oral cavity Oral vestibule Oral cavity proper The Internal Mouth

Slide 7 :

The Oral vestibule A slit like space bounded Laterally by cheek and lips Medially by the buccal and labial surfaces of the upper and lower teeth Posteriorly by the Retromolar area

Slide 8 :

Parts A- attached gingiva B- Free gingiva C- Upper labial frenum D- Mucobuccal fold E- Interdental Papilla F- Cheek G- Oral vestibula I- Mucolabial fold

Slide 9 :

Oral vestibule Oral vestibule- Left side Oral vestibule- right side

Slide 10 :

Part Upper buccal frenum Lower buccal frenum

Slide 11 :

The oral cavity proper Bounded Laterally by palatal and lingual surfaces of the upper and lower teeth Superiorly by the palate (hard & soft) Inferiorly by the tongue and or the floor of the mouth Posteriorly by the isthmus of fauces

Slide 12 :

Part of the Oral cavity proper Hard Palate Uvula Palatoglossal arch Palatine tonsil Tongue

Slide 13 :

Superior boundary Palate- Parts Incisisve papilla Palatine Rugae Median palatine raphe Maxillary tuberosity Fovea Palatina

Slide 14 :

Bony framework of the hard palate Palatine process of the maxilla Horizontal plate of the palatine bone

Slide 15 :

Inferior boundary The Floor of the mouth Parts Ventral surface of the tongue Lingual Frenulum Sublingual fold Sublingual caruncle

Slide 16 :

The tongue Composes of Anterior 2/3 (body)and Posterior 1/3 (root) Presence of lingual papillae that contains taste buds namely: Filiform papilla Fungiform papilla Foliate papilla Circumvallate papilla

Slide 17 :

Nerve Innervations Anterior 2/3 of the tongue Posterior 1/3 of the tongue Taste sensation Chorda tympani of the VII CN or facial nerve General Sensation Lingual Nerve of the mandibular division of V CN or Trigeminal Nerve Taste and general sensation is by IX CN or glossopharyngeal Nerve and X CN or Vagus nerve via internal laryngeal Nerve

Slide 18 :

Muscles of the tongue Both is innervated by the XII CN or Hypoglossal nerve Extrinsic muscles 1. Genioglossus 2. Hyoglossus 3. Stlyoglossus 4. Palatoglossus Its action is to change the size or mass of the tongue Intrinsic muscles 1. Superior longitudinal M 2. Inferior longitudinal 3.Transversus M 4. Vertical M Its action is to change the shape or form of the tongue

Slide 19 :

Extrinsic Muscles of the tongue Genioglossus Muscle

Slide 20 :

Extrinsic Muscle of the tongue Styloglossus muscle

Slide 21 :

Intrinsic muscles of the tongue Superior longitudinal Muscle Vertical and Transverse Muscle Inferior longitudinal Muscle

Slide 22 :

Posterior boundary Isthmus of fauces- parts Isthmus of fauces Uvula Palatopharyngeal arch

Slide 23 :

The Salivary Glands 1. Parotid Gland- the largest of the 3 salivary gland Located anterior to the ear, extending from the cheek bone up to the lower jaw Parotid or Stensens’ duct opens at the oral vestibule opposite upper second molar 2. Submaxillary or submandibula gland- Located at the floor of the mouth posteriorly occupying the digastric triangle Whartons’ duct opens at the sublingual caruncle 3. Sublingual gland Located at the floor of the mouth anteriorly Bartolins and Ravinis are the duct of SL gland opens at the sublingual fold

Slide 24 :

The Salivary glands Sublingual gland Submaxillary gland

Slide 25 :

The Permanent Teeth

Slide 26 :

Anterior teeth Central Incisor Canine Lateral Incisor

Slide 27 :

Posterior teeth 2nd molar 1st molar 2nd premolar 1st premolar

Slide 28 :

Upper permanent teeth Central incisor Lateral incisor Canine 1st premolar 2nd premolar 1st molar 2nd molar

Slide 29 :

The Deciduous Teeth

Slide 30 :

Anterior teeth Central incisor Lateral incisor canine

Slide 31 :

Posterior teeth 2nd molar 1st molar

Slide 32 :

Smile and everybody will smile at you Remember mouth expresses different type of emotions

Slide 33 :

Thank you-The End

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The anatomy of the oral cavity and its structure- Slides
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