. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. Fig. 101.—TranBverae section of embryo chick at end of first day (after KOUilcer). M, mesoblaet; H, hypoblast; m, mednllary plate; E, epiblast; m. g, medullary groove; , medullary fold; eh, chorda dotsalis; P, protovertebral plate; d. m, division of mesoblast. The notochord, marking out the future bony axis of the body, may also be seen during the first day as a well-marked linear extension, just beneath the medullary groove. The cleav- nf. Fig. 103.—
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. Fig. 101.—TranBverae section of embryo chick at end of first day (after KOUilcer). M, mesoblaet; H, hypoblast; m, mednllary plate; E, epiblast; m. g, medullary groove; , medullary fold; eh, chorda dotsalis; P, protovertebral plate; d. m, division of mesoblast. The notochord, marking out the future bony axis of the body, may also be seen during the first day as a well-marked linear extension, just beneath the medullary groove. The cleav- nf. Fig. 103.—Transverse section of chick at end of second day (EOUiker). S, epiblast; H, hypoblast; e. m, external plate of mesoblast dividing (cleavage of mesoblast); , medullary fold; m. g, medullary groove; ao, aorta; p, pleuroperitoneal cavity; P, protovertebral plate. age of the mesoblast, resulting in the commencement of the formation of aomatopleure (body-fold) and the splanchnopleure (visceral fold), is also an early and important event. These give rise between them to the pleuro-peritoneal cavity. The portions of mesoblast nearest the neural canal form masses (ver- tebral plates) distinct from the thinner outer ones (lateral plates). The vertebral plates, when distinctly marked off, as represented in the figure, are termed the protovertebrce (meso- blastic somites), and represent the future vertebrae and the vol- untary muscles of the trunk; the former arising from the inner subdivisions, and the latter from the outer (muscle-plates). It will be understood that the protovertebrse are the results of. 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 Mills, Wesley, 1847-1915. New York, Appleton
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