. Text-book of embryology. Embryology. it-., y -t *' glom. Fig. 137.—Sections illustrating the development of the mesonephros in Birds. (A and B, after Sedgwick, 1881 ; C, D, B, after Schreiner, 1902). A, 22-segment chick at level of the 15th segment; B, 34-segment chick at level of 13th or 14th segment (combined from two sections); C, 45-segment duck at level of 29th segment; D, 45-segment duck at level of 25th segment; B, 45-segment duck at level of 24th segment. A, dorsal aorta ; , archinephric duct; glom, glomerulus; wc, nephrocoele; nt, nephrotome ; , peritoneal canal; , post
. Text-book of embryology. Embryology. it-., y -t *' glom. Fig. 137.—Sections illustrating the development of the mesonephros in Birds. (A and B, after Sedgwick, 1881 ; C, D, B, after Schreiner, 1902). A, 22-segment chick at level of the 15th segment; B, 34-segment chick at level of 13th or 14th segment (combined from two sections); C, 45-segment duck at level of 29th segment; D, 45-segment duck at level of 25th segment; B, 45-segment duck at level of 24th segment. A, dorsal aorta ; , archinephric duct; glom, glomerulus; wc, nephrocoele; nt, nephrotome ; , peritoneal canal; , posterior cardinal vein ; splc, splanchnocoele ; t^ tubule rudiment. mesoderm. The intermediate cell-mass becomes closely apposed to and very soon directly continuous with the duct by a narrow isthmus in each segment—the tubule rudiment (Fig. 137, A). Ventrally, near its junction with the splanchnocoele, the split between the two layers of the nephrotome dilates and forms a definite nephrocoele which opens into the splanchnocoele by a wide peritoneal canal (Fig. 137, B, ). The tubule rudiment develops a lumen leading from nephrocoele into duct,1 and the dorsal wall of the nephrocoele becomes 1 The opisthonephric duct in the Amniota is known as the mesonephric or Wolffian duct as its function is restricted to draining the mesonephros or " Wolffian ;. 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 MacBride, E. W. (Ernest William), 1866-1940; Kerr, John Graham, 1869-; Heape, Walter, 1855-1929. London : Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, bookpubli, booksubjectembryology
