Digestive System

Digestive System

1. Digestive Tract: Oral Cavity and Pharynx

   • Lip
     • Mucocutaneous Junction: The site of transition from epidermis to the epithelium of a mucous membrane
     • Skin Side of Lip: stratified squamous keratinized epithelium
       • Hair Follicles
       • Sebacious glands
       • Sweat glands
     • Mucous Side of Lip: stratified squamous non-keratinized epithelium
       • Labial glands: mucous glands in the underlying connective tissue
     • Orbicularis oris: Skeletal muscle that closes the mouth
     • Lip Margin: epithelium has no keratin, but has a large layer of stratum lucidum. The underlying connective tissue is rich in capillaries and sensory nerve endings (Krause end bulb).
   • Cheek
     • Skin Side of Cheek: stratified squamous keratinized epithelium
     • Mucous Side of Cheek: stratified squamous non-keratinized epithelium
       • Buccal glands: mucous glands in the underlying connective tissue
     • Buccinator: Skeletal muscle of cheek
   • Palate
     •  Oral mucous membrane: lined with stratified squamous non-keratinized epithelium. Covers both the hard and soft palate.
       • Hard palate: anterior part, bony
       • Soft palate: posterior part, formed of muscles
       • Palatine glands: mucous glands in the underlying connective tissue
   • Tongue
   • Teeth

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