Anatomy of Oral Region and Pharynx
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ANATOMY OF ORAL REGION AND PHARYNX
Dr. I Nyoman G. Wardana, M.Biomed
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Oral cavity Extends from the lips to
the oropharyngeal isthmus The oropharyngeal
isthmus: is the junction of mouth and pharynx. Is bounded: Above by the
soft palate and the palatoglossal folds
Below by the dorsum of the tongue
Subdivided into Vestibule & Oral cavity proper
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Vestibule
Slitlike space between the cheeks and the gums
Communicates with the exterior through the oral fissure
When the jaws are closed, communicates with the oral cavity proper behind the 3rd molar tooth on each side
Superiorly and inferiorly limited by the reflection of mucous membrane from lips and cheek onto the gums
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Vestibule cont’d
The lateral wall of the vestibule is formed by the cheek– The cheek is composed of Buccinator muscle, covered laterally by the skin &
medially by the mucous membrane A small papilla on the mucosa opposite the upper 2nd molar tooth marks the opening
of the duct of the parotid gland
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Oral Cavity Proper
It is the cavity within the alveolar margins of the maxillae and the mandible
Its Roof is formed by the hard palate anteriorly and the soft palate posteriorly
Its Floor is formed by the mylohyoid muscle. The anterior 2/3rd of the tongue lies on the floor.
hard
soft palate
mylohyoid
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Floor of the Mouth Covered with mucous
membrane In the midline, a mucosal fold,
the frenulum, connects the tongue to the floor of the mouth
On each side of frenulum a small papilla has the opening of the duct of the submandibular gland
A rounded ridge extending backward & laterally from the papilla is produced by the sublingual gland
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Nerve Supply
o Sensory Roof: by greater palatine and nasopalatine nerves (branches
of maxillary nerve) Floor: by lingual nerve (branch of mandibular nerve) Cheek: by buccal nerve (branch of mandibular nerve)
oMotor Muscle in the cheek (buccinator) and the lip (orbicularis oris)
are supplied by the branches of the facial nerve
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Tongue Mass of striated muscles
covered with the mucous membrane
Divided into right and left halves by a median septum
Three parts:– Body (anterior ⅔)– Root (posterior ⅓)– Apex
Two surfaces:– Dorsal – Ventral
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Dorsal Surface Divided into anterior two
third and posterior one third by a V-shaped sulcus terminalis.
The apex of the sulcus faces backward and is marked by a pit called the foramen cecum
Foramen cecum, an embryological remnant, marks the site of the upper end of the thyroglossal duct
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Anterior two third: mucosa is rough, shows three types of papillae: Filliform Fungiform Vallate
Posterior one third: No papillae but shows nodular surface because of underlying lymphatic nodules, the lingual tonsils
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Ventral Surface Smooth (no papillae) In the midline anteriorly, a
mucosal fold, frenulum connects the tongue with the floor of the mouth
Lateral to frenulum, deep lingual vein can be seen through the mucosa
Lateral to lingual vein, a fold of mucosa forms the plica fimbriata
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Muscles
The tongue is composed of two types of muscles:– Intrinsic– Extrinsic
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Intrinsic Muscles
Confined to tongue No bony attachment Consist of:
– Longitudinal fibers– Transverse fibers– Vertical fibers
• Function: Alter the shape of the tongue
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Extrinsic Muscles
Connect the tongue to the surrounding structures: the soft palate and the bones (mandible, hyoid bone, styloid process)
Include:– Palatoglossus– Genioglossus– Hyoglossus– Styloglossus
Function: Help in movements of the tongue
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Movements
• Protrusion: Genioglossus on both sides acting together
• Retraction: Styloglossus and hyoglossus on both sides acting together
• Depression: Hyoglossus and genioglossus on both sides acting together
• Elevation: Styloglossus and palatoglossus on both sides acting together
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Sensory Nerve Supply Anterior ⅔:
– General sensations: Lingual nerve
– Special sensations : chorda tympani
Posterior ⅓: – General & special sensations:
glossopharyngeal nerve Base:
– General & special sensations: internal laryngeal nerve
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Motor Nerve Supply
Intrinsic muscles: Hypoglossal nerve
Extrinsic muscles: All supplied by the
hypoglossal nerve, except the palatoglossus
The palatoglossus supplied by the pharyngeal plexus
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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
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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)
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THE PALATE
• The palate forms the roof of the mouth• It consist of two regions:
– The hard palate in front– The soft palate behind
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The hard palate
• Is formed by the palatine processes of the maxillae and the horizontal plates of the palatine bones
• It is bounded in front and at the sides by alveolar arches and gums
• Behind, it continuous with the soft palate• It is covered with a dense tissue, formed by
the periosteum and mucous membrane
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Soft palate
• Is a movablefold, suspendedfrom the posterior border of the hard palate, and extending downwards and backwards between the oral and nasal parts of the pharynx
• Composed of:– Muscle fibers– An aponeurosis– Lymphoid tissue– Glands– Blood vessels– Nerves
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Palatine Aponeurosis
Fibrous sheath Attached to posterior
border of hard palate Is expanded tendon of
tensor velli palatini Splits to enclose
musculus uvulae Gives origin & insertion
to palatine muscles
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Muscles
Tensor veli palatini– Origin: spine of sphenoid; auditory tube– Insertion: forms palatine aponeurosis– Action: Tenses soft palate
• Levator veli palatini– Origin:petrous temporal bone, auditory
tube, palatine aponeurosis– Insertion: palatine aponeurosis– Action: Raises soft palate
• Musculus uvulae– Origin: posterior border of hard palate– Insertion: mucosa of uvula– Action: Elevates uvula
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Muscles• Palatoglossus
– Origin: palatine aponeurosis– Insertion: side of tongue– Action: pulls root of tongue
upward, narrowing oropharyngeal isthmus
• Palatopharyngeus– Origin: palatine aponeurosis– Insertion: posterior border of
thyroid cartilage– Action: Elevates wall of the
pharynx
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Sensory Nerve Supply
• Mostly by the maxillary nerve through its branches:– Greater palatine nerve– Lesser palatine nerve– Nasopalatine nerve
• Glossopharyngeal nerve supplies the region of the soft palate
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Motor Nerve Supply
• All the muscles, except tensor veli palatini, are supplied by the:– Pharyngeal plexus
• Tensor veli palatini supplied by the:– Nerve to medial pterygoid, a branch of the
mandibular division of the trigeminal nerve
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MASTICATION MUSCLES
• Temporalis m.• Masseter m.• Lateral pterygoid m.• Medial pterygoid m.
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THE SALIVARY GLAND
• The parotid gland: – Is the largest, weight 25 gr, irreguler, lobulated, yellowish
mass, lying below the external acoustic meatus, between the mandible and th sternocleidomastoid
– The parotid duct: is about 5 cm long, crosses the masseter, and at the anterior border turns inwards pass through the corpus adiposum of the cheec and pierces the buccinator
– Opens upon small papilla on the oral surface of the cheek opposite the crown of the second upper molar tooth
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• The submandibular– Is irregular form– About a size of a walnut– Submandibular duct is about 5 cm long
• The sublingual gland– Is the smallest – It is narrow, flattened, shaped like almond– Weight between 3-4 gr
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THEET
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PHARYNX
• External layer: constrict walls of pharynx during swallowing– Superior constrictor– Middle constrictor– Inferior constrictor
• Internal layer: elevate (shorten and widen) pharynx and larynx during swallowing and speaking– Palatopharyngeus– Stylopharyngeus– Salpingopharyngeus
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