The development of the human body; a manual of human embryology . Fig. 54.—Embryo mm. , Allantois; Am, amnion; bs, belly-stalk; h, heart; m, medullary groove;, neurenteric canal; , caudal protuberance; ps, primitivestreak; ys, yolk-stalk.—(Etcrnod.) 10 113 H4 THE DEVELOPMENT OF THE HUMAN BODY. canal is somewhat obscure, and it is of very brief persist-ence, closing at an early stage of development so as toleave no trace of its existence. As development proceeds the medullary folds increasein height and at the same time incline toward one another. Fig. 55.—Diagram of a Longitu
The development of the human body; a manual of human embryology . Fig. 54.—Embryo mm. , Allantois; Am, amnion; bs, belly-stalk; h, heart; m, medullary groove;, neurenteric canal; , caudal protuberance; ps, primitivestreak; ys, yolk-stalk.—(Etcrnod.) 10 113 H4 THE DEVELOPMENT OF THE HUMAN BODY. canal is somewhat obscure, and it is of very brief persist-ence, closing at an early stage of development so as toleave no trace of its existence. As development proceeds the medullary folds increasein height and at the same time incline toward one another. Fig. 55.—Diagram of a Longitudinal Section through an Embryo OF MM. al, Allantois; am, amnion; B, belly-stalk; ch, chorion; h, heart; ucneurenteric canal; Y, chorionic villi; Y, yolk-sac.—(von Spec.) (Fig. 40) so that their edges finally come into contact andlater fuse, the two ectodermal layers forming the oneuniting with the corresponding layers of the other (). By this process the medullary groove becomes con-verted into a medullary canal which later becomes the THE MEDULLARY CANAL. 115
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectembryol, bookyear1902
