. Chordate anatomy. Chordata; Anatomy, Comparative. CRMATOME MYOTOME SCLEROTOME HYPOCHORDA HYPOMERE COELOM SUBINTESTINAL, BLOOD VESSEL A. HEAD B. TRUNK Fig. 198.—Diagrams of cross sections in A, head and B, trunk regions of an elasmo- branch embryo showing the fundamental similarity of the two regions. The discovery that the coelom of elasmobranch embryos extends throughout head and trunk and that in this respect the two regions are alike was made by the English embryologist, Francis Balfour. EVTREMITV SOMATIC MUSCLE INTESTINE ENDODERM COELOM. NEURAL CREST SOMATIC MOTOR NERVE SPINAL CORD SPINA
. Chordate anatomy. Chordata; Anatomy, Comparative. CRMATOME MYOTOME SCLEROTOME HYPOCHORDA HYPOMERE COELOM SUBINTESTINAL, BLOOD VESSEL A. HEAD B. TRUNK Fig. 198.—Diagrams of cross sections in A, head and B, trunk regions of an elasmo- branch embryo showing the fundamental similarity of the two regions. The discovery that the coelom of elasmobranch embryos extends throughout head and trunk and that in this respect the two regions are alike was made by the English embryologist, Francis Balfour. EVTREMITV SOMATIC MUSCLE INTESTINE ENDODERM COELOM. NEURAL CREST SOMATIC MOTOR NERVE SPINAL CORD SPINAL GANGLION RAMUS DORSALIS NOTOCHORD CENTRUM NEPHROTOME CORIUM VISCERAL MUSCLE RAMUS VENTRALIS •r /" DERMATOME MYOTOME SCLEROTOME PARIETAL MESODERM ISCERAL MESODERM Fig. 199.—A stereogram of the trunk region of a vertebrate embryo, based upon elasmobranch embryos. The figure shows an earlier stage of development on the right side, a later stage on the left. The extension of the myotome to form the lateral trunk musculature is shown. The lateral trunk musculature of the ventral half of the body- wall thus arises as a secondary invasion. (Redrawn after Braus.) forty pairs. The original metamerism of the myotomes, which persists even in the adults of the lower vertebrates, becomes largely lost in adult man and mammals as the result of a number of processes among which. 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 Neal, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : P. Blakiston's Son & Co.
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Keywords: ., bookcentury1900, bookpublisherphi, booksubjectanatomycomparative
