. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. FIG. 316.—Scheme of origin of pronephric tubules after Felix. A, earlier, B, later stage, c, axiom; d, pronephric tubule and duct; e, epimere; h, hypomere; m, mesomere (lined); n, nephrostome; my, myotome; so, sp, somato- and splanchnopleure. formation of the pronephros (two in most urodeles and amniotes; three in lampreys, anura, some sharks and some amniotes; four or five in some sharks andLepidosteus; seven or eight in skates; eight to eleven in Amia; and a dozen in some caecilians; while it is claimed that
. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. FIG. 316.—Scheme of origin of pronephric tubules after Felix. A, earlier, B, later stage, c, axiom; d, pronephric tubule and duct; e, epimere; h, hypomere; m, mesomere (lined); n, nephrostome; my, myotome; so, sp, somato- and splanchnopleure. formation of the pronephros (two in most urodeles and amniotes; three in lampreys, anura, some sharks and some amniotes; four or five in some sharks andLepidosteus; seven or eight in skates; eight to eleven in Amia; and a dozen in some caecilians; while it is claimed that the whole series of nephridial tubules of Bdellostoma is pronephric). The somatic wall of these nephrotomes (fig. 316) grow out toward. FIG. 317.—Reconstruction from longitudinal sections of pronephros of Hypogecphis (csecilian), after Brauer. Pronephric duct (pd) and primary pronephric tubules light; the rest of the somites (nephrotomes) black; glomeruli between tubules 2-8. The three trunk somites in front of i develop no tubules. the ectoderm, thus forming slender pronephric tubules (or solid cords which later become canalized), the proximal end of each communica- ting freely with the metaccele by way of the cavity of the nephrotome, the opening of the latter into the metaccele being the nephrostome. As will be understood, these tubules, like the nephrotomes, are meta- meric in character, equalling the somites in number. The distal ends. 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 Kingsley, J. S. (John Sterling), 1854-1929. Philadelphia, P. Blakiston's son & co.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1912
