e13.Digestive tract消化管.ppt

组织胚胎学课件 七年制英文医学班专用 Chapter 13  Digestive tract ---Digestive system: Digestive tract Digestive gland 1. Components of digestive tract ---oral cavity ---pharynx ---esophagus ---stomach ---small intestine ---large intestine 2. General plan of digestive tract ---Except for oral cavity and pharynx, all other organs share a similar histological plan 1) mucosa ---epithelium: stratified squamous epi.: protecting simple columnar epi,: digestion and absorption ---lamina propria: LCT-compact CT: contain more cells and fiber BV, LV-capillaries Lymphoid T glands: structures formed by invagination of epi. into lamina propria ---muscularis mucosa: a thin layer of SM 2) submucosa: more dense CT small artery and vein, LV glands (esophagus and duodenum) submucosa N plexus: -multipolar N -unmyelinated NF -function: regulate the contract of SM and secreting of gland *Plica: projection of mucosa and submucosa 3) muscularis externa smooth muscle skeletal muscle inner circular and outer longitudinal *Nerve plexus: regulate the movement of M 4) adventitia: CT serosa: CT + mesothelium fibrosa: LCT 3. Esophagus 1)????? mucosa: epithelium: stratified squamous epi. lamina propria: compact CT muscularis mucosa: longitudinal arranged SM 2)????? submucosa: LCT esophageal gland: mucous gland 3)????? muscularis: inner circular and outer longitudinal upper 1/3: skeletal muscle middle 1/3: mixed of skeletal M and smooth muscle lower 1/3: smooth muscle 4) adventitia: fibrosa 4. Stomach ---dilated part ---store food temporarily ---digest protein primarily ---absorb part of water and Ions 1)????? Mucosa: ---plica-longitudinal ---shallow ditch- gastric area(2-6mm) ---gastric pit- small depressions ①epithelium: simple columnar epi surface mucous cell: -tall columnar -N ovoid, basally-located -mucinogen granule -tight junction -high HCO3- undissolved mucus less endocrine cell ②