Chapter 13 Digestive tract
Chapter 13 Digestive tract
Digestive system Digestive tract P Digestive gland
---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, allother organs share a similar histological plan 袋膜 线毛 彼甓 -浆 消化外 腺的导 粘膜下腺 析! 粘股 肌间拧丛 上皮 固有层 巴小结 岩犋 -粘膜下神经从 纵行肌 ……环行肌
2. General plan of digestive tract ---Except for oral cavity and pharynx, all other organs share a similar histological plan
1)mucosa epithelium e stratified squamous epi. protecting e simple columnar epi, digestion and absorption lamina propria: LCT-compact CT: contain more cells and fiber ●BV, LV-capillaries ● Lymphoid T e glands: structures formed by invagination of epi into lamina propria ---muscularis 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,L∨ e 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)muscularis externa ● smooth muscle ● skeletal muscle inner circular and outer longitudinal XNerve plexus: regulate the movement of 4)adventitia: CT serosa CT+ mesothelium ● fibrosa:LcT
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 S lamina propria: compact CT e muscularis mucosa: longitudinal arranged sm 2 submucosa LCT esophageal gland: mucous gland
3. Esophagus 1) mucosa: epithelium: stratified squamous epi. lamina propria: compact CT muscularis mucosa: longitudinal arranged SM 2) submucosa: LCT esophageal gland: mucous gland
小血管 上皮 固有层 粘膜肌层 2食管腺 ,粘膜下层 环行肌 一纵行肌 3 muscularis 外膜 g inner circular and outer longitudinal e upper 1/3: skeletal muscle e middle 1/3: mixed of skeletal m and smooth muscle e lower 1 /3: smooth muscle 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
Stomach dilated part store food temporarily digest protein primarily absorb part of water and lons
4. Stomach ---dilated part ---store food temporarily ---digest protein primarily ---absorb part of water and Ions
