Chapter 13 Dig gestive tract
Chapter 13 Digestive tract
glande Digestive system submandibular Digestive tract Digestive gland pancreas common duct common bile duct ansverse colon cecum
---Digestive system: • Digestive tract • Digestive gland
1. Components of digestive tract oral cavity pharynx esophagus --stomach small intestine large intestine
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 Submucosa Nerve Gand in submucosa Duct from UCosa Submucosa Muscularis Serosa Mucous Connective epithelium muscle propra ongitudinal Peritoneum
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 o epi into lamina propria aris mucosa: a thin layer of SM
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
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)tunica muscularis smooth muscle skeletal muscle inner circular and outer longitudinal Nerve plexus: requlate the movement of
3) tunica muscularis • smooth muscle • skeletal muscle • inner circular and outer longitudinal *Nerve plexus: regulate the movement of M
4)tunica adventitia: CT serosa: cT+ mesothelium fibrosa: LCT
4) tunica adventitia: CT • serosa: CT + mesothelium • fibrosa: LCT
3. Esophagus 1) mucosa epithelium: stratified squamous epi lamina propria: CT muscularis mucosa: longitudinal arranged sm 2) submucosa LCT esophageal gland: mucous gland
3. Esophagus 1) mucosa: • epithelium: stratified squamous epi. • lamina propria: 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 mdde1/3: mixed of|)的、张小管 上皮 skeletal M and E 出一固有层 粘膜肌层 smooth muscle · lower1/3: smooth 一粘膜下层 环行肌 muscle 5,;*:∵,一纵行肌 外膜 4)adventitia fibrosa
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
