. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. myo FIG. 335.—DIAGRAMS TO ILLUSTRATE THE DEVELOPMENT OF THE CHIEF PRODUCTS OF THE MESODERM. (After J. W. van Wijhe.) A and B, transverse sections through an embryo in which the myotomes are beginning to become separated from the middle portions of the mesoderm, which includes the nephrotomes, A being in the pronephric, and B in the mesonephric regions. C, the same, shortly after this separation is completed, and D, later stage, in which the myotomes have extended dorsally and ven- trally so as to surround the body, and ha
. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. myo FIG. 335.—DIAGRAMS TO ILLUSTRATE THE DEVELOPMENT OF THE CHIEF PRODUCTS OF THE MESODERM. (After J. W. van Wijhe.) A and B, transverse sections through an embryo in which the myotomes are beginning to become separated from the middle portions of the mesoderm, which includes the nephrotomes, A being in the pronephric, and B in the mesonephric regions. C, the same, shortly after this separation is completed, and D, later stage, in which the myotomes have extended dorsally and ven- trally so as to surround the body, and have nearly lost their cavities. ao, aorta, above which is the notochord, and above this again the medullary cord ; d, intestine ; kd, gonad ; Ih, general crelome ; msc, portion of coelome connect- ing general ccelome with its portion in the myotome (myoco-le, myc); nt, nephrotome or mesonephric tubule; p, pronephros ; pg, pronephric or segmental duct; ski, sclerotome, which gives rise to the skeletogenous layer from which the vertebral column arises ; si, mesenchyme of the lateral 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 Wiedersheim, Robert, 1848-1923; Parker, W. N. (William Newton), d. 1923. London, Macmillan and co. , limited
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