2)development of esophagus and stomach (1 development of esophagus laryngotracheal diverticulum to stomach/th derived from primitive gut extending fror with the descent of the heart and lungs, it lengthens rapidly muscular coat, formed by surrounding mesenchyme /striated in upper two-thirds /smooth in lower one -third 食管
2) development of esophagus and stomach ① development of esophagus ---derived from primitive gut extending from the laryngotracheal diverticulum to stomach ---with the descent of the heart and lungs, it lengthens rapidly ---muscular coat, formed by surrounding mesenchyme /striated in upper two-thirds /smooth in lower one-third
2 development of stomach b week, appears as a fusiform dilation of foregut
② development of stomach ---by 4 th week, appears as a fusiform dilation of foregut
---greater and lesser curvatures by the 5t week, posterior part of stomach grow faster than the anterior portion by 7-8th week, around the longitudinal axis the stomach carries out a 90 clockwise rotation its left side to face anterior 胃小弯 胃 大弯
---greater and lesser curvatures: by the 5 th week, posterior part of stomach grow faster than the anterior portion ---by 7-8 th week, around the longitudinal axis, the stomach carries out a 90°clockwise rotation, its left side to face anterior
-rotation around the transverse axis the caudaL(pyloric)end of/ the stomach moves upward and to the right,the cephalic( cardiac)end moves downward and to the left 胰腺 肝 一左上 右下
---rotation around the transverse axis, the caudal(pyloric) end of the stomach moves upward and to the right; the cephalic( cardiac)end moves downward and to the left
胃小 只弯 背系膜 系膜