. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. DEVELOPMENT OF EXTERNAL FORM 93 Leaving aside for the present all consideration of the further development of the limbs and branchial arches, the further evolution of the general form of the body may be rapidly sketched. In an embryo (Fig. 57) from Ruge's collection, described and figured by His and measuring mm. in length,* the prolongation of the. _W L-LI Fig. 57.—Embryo mm. Long. LI, Lower limb; U, umbilical cord; Ul, upper limb; Y, yolk-sac.—(His.) margins of the umbilicus has inc
. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. DEVELOPMENT OF EXTERNAL FORM 93 Leaving aside for the present all consideration of the further development of the limbs and branchial arches, the further evolution of the general form of the body may be rapidly sketched. In an embryo (Fig. 57) from Ruge's collection, described and figured by His and measuring mm. in length,* the prolongation of the. _W L-LI Fig. 57.—Embryo mm. Long. LI, Lower limb; U, umbilical cord; Ul, upper limb; Y, yolk-sac.—(His.) margins of the umbilicus has increased until more than half the yolk-stalk has become enclosed within the umbilical cord. The nape and sacral bends are still very pronounced, although the embryo is beginning to straighten out and is not quite so much coiled as in the preceding stage. At the posterior end of the body there has * This measurement is taken in a straight line from the most anterior portion of the nape bend to the middle point of the sacral bend and does not follow the curvature of the embryo. It may be spoken of as the nape-rump length and is convenient for use during the stages when the embryo is coiled upon Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original McMurrich, J. Playfair (James Playfair), 1859-1939. Philadelphia : P. Blakiston's son & co.
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Keywords: ., bookautho, bookcentury1900, bookdecade1910, booksubjectembryology
