Human anatomy, including structure and development and practical considerations . e being thus attachedby a mesentery. That portion of the latter connected with the stomach is known as themLsoj^astriiiifi, that with the intestinal tube as the meseiiteriiim coni))iiine {y\<^.\\]^). riu elongation of the stomach soon results in loss of the primary sagittal direc-tion of its axis, which becomes obliciue, the lower end of the organ passing to theright, while its upper end is displaced towards the left in conseciuence of the increasingvolume of the liver. Embryos of the sixth week exhibit marked
Human anatomy, including structure and development and practical considerations . e being thus attachedby a mesentery. That portion of the latter connected with the stomach is known as themLsoj^astriiiifi, that with the intestinal tube as the meseiiteriiim coni))iiine {y\<^.\\]^). riu elongation of the stomach soon results in loss of the primary sagittal direc-tion of its axis, which becomes obliciue, the lower end of the organ passing to theright, while its upper end is displaced towards the left in conseciuence of the increasingvolume of the liver. Embryos of the sixth week exhibit marked change in the formof the stomach, since the dorsal wall, later the greater curvature, has become bulgedspineward, while the ventral surface presents a slight concavity foreshadowing the latersmaller curvature. Somewhat later the stomach also undergoes rotation about itslongitudinal axis, its primary left surface becoming the ventral or anterior, and itsprimary ventral border the lesser or upper curvature. The primary wall of the Fig. 1431. Allantoic duct- External surface—\. Cloacal membrane . A. :•?.?• _Tail-bud Part of caudal end of sagittal section of rabbit embryo of twelve days, showing cloacal space in communicationwith lower end of gut-lube and allantoic duct. X 35- stomach consists of the entoblastic lining surrounded by the splanchnopleuric meso-blast. The differentiation of the gastric glands begins towards the close of the thirdmonth as minute epithelial outgrowths from the entoblastic layer. A few weeks laterthe glands become branched, and the parietal cells appear as differentiations fromsingle epithelial elements lining the peptic follicles. In the fifth month the length ofthe glands has increased to about . 20 mm., and during the succeeding month tofrom . mm. (Kolliker). Differentiation of the mesoblastic tissue into the innercircular and outer muscular layers occurs during the fourth month. The lower funnel-shaped pyloric end of the stomach at first
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Keywords: ., bookauthormc, bookcentury1900, bookdecade1910, booksubjectanatomy
