. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. 78 THE MESODERMIC SOMITES dorsal of which is termed the somatic mesoderm, while the ventral one is known as the splanchnic mesoderm (Fig. 48, so and sp; and Fig. 49), the cavity which separates these two layers being the embryonic body-cavity or pleuroperitoneal cavity (coslom), which will eventually give rise to the pleural, pericardial and peritoneal cavities of the adult as well as the cavity of each tunica vaginalis Fig. 49.—Transverse Section of an Embryo of mm. (See Fig. 53
. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. 78 THE MESODERMIC SOMITES dorsal of which is termed the somatic mesoderm, while the ventral one is known as the splanchnic mesoderm (Fig. 48, so and sp; and Fig. 49), the cavity which separates these two layers being the embryonic body-cavity or pleuroperitoneal cavity (coslom), which will eventually give rise to the pleural, pericardial and peritoneal cavities of the adult as well as the cavity of each tunica vaginalis Fig. 49.—Transverse Section of an Embryo of mm. (See Fig. 53) showing on either side of the medullary canal a mesodermic somite, the inter- MEDIATE Cell-mass, and the Ventral Mesoderm.—(vonLenhossek.) Beginning in the neck region, the formation of the mesodermic somites proceeds posteriorly until finally there are present in the human embryo thirty-eight pairs in the neck and trunk regions of the body, and, in addition, a certain number are developed in what is later the occipital region of the head. Exactly how many of these occipital somites are developed is not known, but in the cow four have been observed, and there are reasons for believing that the same number occurs in the human embryo. In the lower vertebrates a number of cavities arranged in pairs occur in the more anterior portions of the head and have been homologized with mesodermic somities. Whether this homology be perfectly correct or not,. 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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