Gross Anatomy Lecture Notes - Oral Cavity and Development of Face and Palate

Gross Anatomy Lecture Notes - Oral Cavity and Development of Face and Palate

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D503/D850 Gross Anatomy Lecture Notes 11/21/11 – Oral Cavity and Development of Face and Palate Head 8 - The boundaries of the oral cavity o The roof of the oral cavity is the palate which is also the floor of the nasal cavity. o Floor is mylohyoid and geniohyoid muscles. o Tongue sits on top of geniohyoid muscles which sit on top of mylohyoid muscles. o The lateral walls are the cheeks. o The anterior walls are the lips. o The posterior boundary is the palatoglassal arches or folds that communicate the oral cavity with the oral pharynx. - The upper and lower lips are attached to frenulum, slender mucosal folds, to gums of upper and lower jaws. - Oral cavity is divided into two parts o Vestibule: U-shaped space between the cheeks and lips and the teeth and gums. Kept clean by the muscular tone of the cheeks and lips. o Oral cavity proper: everything else - Contents of the oral cavity: o Tongue o Teeth o Deep part of the submandibular gland and its duct o The sublingual glands and its ducts o The nerve and blood supply to these structures - The tongue has two kinds of mucous membranes o Anerior 2/3 on the dorsal surface Thick mucous membrane and covered by circumvallae papillae some of which have taste buds associated with them. o Ventral surface Thin mucous membrane You can see the deep lingual vein more prominently along with deep lingual artery and a branch of the lingual nerve. You can place drugs here like nitro for quick absorption because of thin membrane to deep lingual vein. Relieve angina pain There is a frenulum, mucosal folds, that joins tongue to oral cavity. Near the base of this frenulum and sublingual curuncles or papillae o Represent the openings of the submandibular duct Saliva is expressed into the oral cavity this way. Some can squirt saliva out of these caruncles. Just lateral to the sublingual curuncles is a sublingual ridge. o Unlike other glands, the sunlignual salivary gland has more than one duct: it has along 8 to 15 ducts that opens up in the ridge in the anterior part of the floor of the mouth.
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Structure of Cheek and Lips - Contain principle muscles in cheek wall o Buccinators Parotid (Stenson’s) duct passes through the muscles. Opens into little papilla opposite the 2 nd molar tooth. o Mucous membrane contains multiple mucosal glands that keep the space moist. o Between the teeth and the cheek wall is the vestibule of the mouth o Medial to the teeth is the oral cavity proper. o On the lips, you’ll see a mucous membrane with mucosal glands. The palate forms the roof of the oral cavity - Hard palate o Two parts Palatine processes Contains maxillary teeth Behind out central and lateral incisors is a wedge-shaped palate known as the primary palate.
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