. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. THE BLADDER 361 month it enlarges to become more sac-like, while the intra-embryonic portion of the allantois degenerates to a solid cord extending from the apex of the bladder to the umbilicus and is known as the urachus. During the enlargement of the bladder the terminal portions of the urinogenital ducts are taken up into its walls, a process which continues until finally the ureters and Wolffian ducts open into it separately, the ureters opening to the sides of and a little anterior to th
. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. THE BLADDER 361 month it enlarges to become more sac-like, while the intra-embryonic portion of the allantois degenerates to a solid cord extending from the apex of the bladder to the umbilicus and is known as the urachus. During the enlargement of the bladder the terminal portions of the urinogenital ducts are taken up into its walls, a process which continues until finally the ureters and Wolffian ducts open into it separately, the ureters opening to the sides of and a little anterior to the ducts. This condition is reached in embryos of about 14 Fig. 220.—Reconstruction of the Cloacal Structures of an Embryo of 25 mm. bl, Bladder; m, Mullerian duct; r, rectum; sg, urogenital sinus; sy, symphysis pubis; u, ureter; ur, urethra; w. Wolffian duct.—(Adapted from Keibel.) (Fig. 219), and in later stages the interval between the two pairs of ducts is increased (Fig. 220), resulting in the formation of a short canal connecting the lower end of the bladder which receives the ureters with the upper end of the urogenital sinus, into which the Wolffian and Mullerian ducts open. This connecting canal repre- sents the urethra (Fig. 220, ur), or rather the entire urethra of the female and the proximal part of that of the male, since a considerable portion of the latter canal is still undeveloped (see p. 364). From. 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
