Digestive system Oral cavity 1 Digestive system general

Digestive system Oral cavity 1. Digestive system general feature 2. Oral cavity (lips, cheek, gingiva, palate) soft and hard 3. Tongue 4. Teeth 5. Salivary glands 6. Tonsils Digestive system = digestive tube + glands

Oral cavity Functions • І. Main 1. Digestion (ingestion, mastication) • 2. Moistening of food • ІІ. Additional 1. Articulation • 2. Facial expression • 3. Sensory reception • 4. Respiratory • І. Mucosa • 1. Еpithelium – stratified squamous nonkeratinized epithelium (180 -600 mkm) • 2. Lamina propria – loose connective tissue • 3. Muscularis mucosa-smooth muscular tissue • ІІ. Submucosa - loose connective tissue • (glands)

Lips 1. Hear-bearing skin : • а) epithelium stratified squamous keratinized (4 layers) b) lamina propria (loose connective tissue with hair follicles sweat and sebaceous glands) 2. Transitional (vermilion): external (smooth) and internal zone 3. Mucosal • а) epithelium stratified squamous nonkeratinized b) lamina propria (papillae) c) submucosa

Tongue Functions 1. Mechanical 2. Receptory (general and taste) 3. Articulation Tunices І. Mucosa ІІ. Submucosa ІІІ. Muscular ІV. Aponeurosis Morphofunctional peculiarities of the lover surface of the tongue 1. Thin permeable epithelium 2. Well prominent blood supply 3. Salivary glands

Cheeks Cheek surfaces 1. External (skin) 2. Internal (mucosa) • І. Skin • ІІ. Muscle • ІІІ. Mucosa zones 1. Upper (maxillary) 2. Lover (mandibulary) 3. Intermediate (no salivary glands, parotid glands ducts) 1. Mucosa • а) stratified squamous nonkeratinized epithelium (smear); • б) lamina propria (dense connective tissue, elastic fibers). 2. Submucosa (salivary glands). 3. Muscular tunic (skeletal muscle). Adipose body of Bisha.

Palate • Separates oral and nasal cavity • І. Hard palate • Zones 1. Adipose • 2. Mucous • 3. Marginal • 4. Middle line (epithelial bodies) • ІІ. Soft palate • Oral surface (strutified squamous nonkeratinized epithelium) • Nasal surface (ciliated epithelium)

Salivary glands • Large (3 pairs) + numerous minor FUNCTIONS • І. Exocrine (слиноутворення) • 1. Зволоження їжі • 2. Дезінфекція • 3. Травлення • 4. Артикуляція • ІІ. Endocrine (паротин, ІПФ, ФРЕ, ФРН, ВІП, глюкагон, калікреїн, ренін. . . ) • ІІІ. Excretion • ІV. Homeostatic • Saliva 1. Water-99% 2. Mineral (Na, K, Cа, Fe …) 3. Organic (enzymes, mucous) • Cells (leukocytes, epitheliocytes)

MFU– ACINUS secretory potion+ intrecallated duct+ striated duct

Parotid gland

Submandibular gland

submandibular

Sublingual gland

Tonsils • Lymph epithelial ring of Pirogov-Waldeier 7 tonsils : 2 tubular, 2 palatine, lingual, pharyngeal, laryngeal • Functions • 1. Protective • 2. Immune І. Mucosa: • а) epithelium stratified squamous nonkeratinized infiltrated • b) lamina propria – loose connective tissue with B lymphocytes) ІІ. Submucosa – septae, capsule ІІІ. Muscular tunic skeletal muscle