The development of the human body; a manual of human embryology . Fig. 169.—Reconstruction ok Embryo of 20 ; K, kidney; L, liver; S, stomach; SC, suprarenal bodies;II7, mesonephros.—(Mall.) The remaining coils elongate rapidly and are throwninto numerous secondary coils, all of which are still con-tained within the ccelom of the umbilical cord (Fig. 170).When the embryo has reached a length of about 40 coils rather suddenly return to the abdominal cavity, THE INTESTINE. 321 and now the caecum is thrown over toward the right, sothat it comes to lie immediately beneath the liver
The development of the human body; a manual of human embryology . Fig. 169.—Reconstruction ok Embryo of 20 ; K, kidney; L, liver; S, stomach; SC, suprarenal bodies;II7, mesonephros.—(Mall.) The remaining coils elongate rapidly and are throwninto numerous secondary coils, all of which are still con-tained within the ccelom of the umbilical cord (Fig. 170).When the embryo has reached a length of about 40 coils rather suddenly return to the abdominal cavity, THE INTESTINE. 321 and now the caecum is thrown over toward the right, sothat it comes to lie immediately beneath the liver on theright side of the abdominal cavity, a position which it re-tains until about the fourth month after birth (Treves).The portion of the large intestine which formerly pro-jected into the umbilical ccelom now lies transverselyacross the upper part of the abdomen, crossing in front ofthe duodenum and having the remaining portion of thesmall intestine below it. The elongation continuing, the. Fig. 170.—Reconstruction of the Intestine of an Embryo of 19 Figures on the Intestine Indicate the Primary Coils.—(Mall.) secondary coils of the small intestine become more numer-ous and the lower portion of the large intestine is throwninto a loop which extends transversely across the lowerpart of the abdominal cavity and represents the sigmoidflexure of the colon. At the time of birth this portion ofthe large intestine is relatively much longer than in theadult, amounting to nearly half the entire length of thecolon (Treves), but after the fourth month after birth areadjustment of the relative lengths of the parts of the27 322 THE DEVELOPMENT OF THE HUMAN BODY. colon occurs, the sigmoid flexure becoming shorter andthe rest of the colon proportionally longer, whereby thecaecum is pushed downward until it lies in the right iliacfossa, the ascending colon being thus established.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectembryol, bookyear1902
