Basic Anatomy and Physiology of the Lips and Oral Cavity. Dr. Faghih
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1 Basic Anatomy and Physiology of the Lips and Oral Cavity Dr. Faghih
2 It is divided into seven specific subsites : 1. Lips 2. dentoalveolar ridges 3. oral tongue 4. retromolar trigone 5. floor of mouth 6. buccal mucosa 7. hard palate
3
4 the lips and oral cavity comprise the initial part of the upper digestive tract and thus play a key role in food ingestion Speech production additionally developed during the course of phylogenesis. large percentage of the taste receptors are located in the oral cavity
5 Anatomy
6 Oral Vestibule is bounded : externally by the lips and cheeks internally by the alveolar processes and teeth
7 When the teeth are in occlusion, the oral vestibule communicates with the oral cavity via a space behind the last molar.
8 Lips and Cheeks formed largely by the mimetic muscles, are lined on their mucosal side by nonkeratinized squamous epithelium
9 Lips longer upper lip shorter lower lip labial commissures nasolabial fold lamina propria orbicularis oris muscle
10
11 blood supply : Superior and inferior labial arteries drained primarily facial vein
12 With inflammatory lesions of the lip, infectious organisms can spread into the cranial cavity via connections between the orbital veins and cavernous plexus
13 lymphatic drainage : The submandibular and submental lymph nodes sensory innervation The infraorbital nerve, mental nerve
14 Cheeks form the lateral boundaries of the oral vestibule contain small salivary glands The buccinator forms the muscular framework its motor innervation from branches of the facial nerve
15 The Bichat fat pad (buccal fat pad) is located between the buccinator muscle and the overlying masseter Muscle The excretory duct of the parotid gland opens opposite the upper second molar
16
17 Masticatory Muscles masseter muscle Temporalis muscle Medial pterygoid muscles lateral pterygoid muscles all supplied by the mandibular nerv
18
19 Teeth Two incisors One canine Two premolars Three molars
20 Each tooth consists of Crown root apex neck (cervix) Enamel pulp chamber The teeth are anchored in the alveoli by the cementum, the bony alveolarwall itself, and the gingiva. These anchoring and supporting structures are known collectively as the periodontium
21 The alveolar processes in the maxilla also form the floor of the maxillary Normally, the roots of the second premolar and first molar are very closely related to the maxillary sinus
22 The arteries that supply the maxilla and mandible: Inferior alveolar artery anterior superior alveolar arteries posterior superior alveolar arteries their innervation from : branches of the maxillary nerve branches of the mandibular nerve
23 Oral Cavity is bounded : anteriorly and laterally by the alveolar ridge and teeth superiorly by the hard and soft palate posteriorly by the faucial isthmus This narrow opening between the oral cavity and pharynx is bordered by the soft palate with the uvula dorsum of the tongue
24
25 Palate The hard palate is formed by Anteriorly palatine processes of the maxilla Posteriorly the incisive bone, and the horizontal plates of the palatine bones The palatal muscles are tensor veli palatini levator veli palatini Palatoglossus Muscle of the uvula
26 The palatal mucosa, contains numerous salivary glands The palatal mucosa receives its sensory innervation from greater and lesser palatine nerves The blood supply to the palate is derived from the ascending palatine branch of the facial artery
27
28
29 Developmentally, the individual muscular components of the soft palate are derived from different structures and are therefore supplied by different cranial nerve IX X V
30 Tongue The main anatomical subdivisions Apex Body base or root The body of the tongue is separated from the base by a V-shaped groove called the terminal sulcus
31 four extrinsic muscles 1. Genioglossus 2. Hyoglossus 3. Styloglossus 4. Palatoglossus four intrinsic muscles 1. superior-inferior longitudinal 2. Transverse 3. vertical
32 Numerous papillae, project from the surface of the tongue and give it its characteristic roughness Four types of papillae are distinguished: 1. Filiform 2. Fungiform 3. vallate, 4. Foliate The microscopic taste are most numerous on the vallate and foliate papillae
33
34 blood supply from lingual and sublingual arteries Homonymous accompanying veins provide for drainage via the facial vein Lymphatic drainage submandibular and submental lymph nodes
35 All of the musculature of the tongue derives its innervation via the hypoglossal nerve with the exception of the palatoglossus, which is supplied by a pharyngeal branch of the vagus nerve.
36 The general sensory innervation of the anterior two thirds of the tongue is provided by the lingual nerve The special sensory innervation of the oral tongue for taste is provided by the chorda tympani nerve (CN VII) both functions are performed by the glossopharyngeal nerve for the base of tongue.
37 Floor of Mouth The floor of mouth is a mucosal surface bordered by the oral tongue and alveolar ridge laterally and anteriorly. The posterior margin is the anterior tonsillar pillar The mylohyoid and hyoglossus muscles provide the structural support for contents of the space.
38 A branch of the lingual nerve provides sensation for the floor of mouth The lymphatic drainage of the anterior aspect of this space may cross to contralateral submental-submandibular nodes The posterior portion of the space tends to drain to ipsilateral upper cervical lymph nodes.
39 Physiology
40 Importance for Food Intake Lips sealing the oral cavity during chewing and swallowing Tongue multifunction organ with both motor and sensory properties Molars greatest importance in chewing
41 Taste There are only four basic taste sensations: 1) Sweet 2) Sour 3) Salty 4) Bitter The sensory experience of taste is a much more complex phenomeno Results from a combination of olfactory, thermal, mechanical, and sensory impressions.
42 Importance in Phonation and Articulation The musculature of the lips has an essential role in phonation lingual articulation joins with the pharynx, nose, and paranasal sinuses
43 Methods of Examining the Lips and Oral Cavity
44 Inspection of the lips and oral cavity additional diagnostic procedures
45 Visual Inspection
46 With hypoglossal nerve palsy, the tongue will deviate toward the affected side With Glossopharyngeal nerve palsy, in which the uvula and palatal arches deviate toward the healthy side
47
48 Palpation better assess the consistency and depth of the suspicious Finding The cervical lymph nodes should also be palpated.
49 Taste Testing Abnormalities of taste are classified as : 1) hypogeusia 2) hypergeusia 3) Ageusia
50 Subjective Taste Testing Chemogustometry Electrogustometry Objective Taste Testing
51 Imaging Procedures Ultrasound Computed Tomography Magnetic Resonance Imaging
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