. Chordate anatomy. Chordata; Anatomy, Comparative. REPRODUCTION 29 of reproduction. Otherwise mammalian eggs are of microscopic dimen- sions ( to mm. in diameter). The egg (Fig. 29) is covered by a delicate membrane (zona pellucida) external to which may be a cellular membrane (corona radiata), both contributed by the G' 'OV Fig. 27.—Amphibian eggs. A, of frog, soon after laying; B, early larva of frog, just before hatching; C, of the salamander, Cryptobranchus allegheniensis. A and C, approximately actual size; B, enlarged. G, gelatinous layer; L, larva; OV, ovum. {A and B, r
. Chordate anatomy. Chordata; Anatomy, Comparative. REPRODUCTION 29 of reproduction. Otherwise mammalian eggs are of microscopic dimen- sions ( to mm. in diameter). The egg (Fig. 29) is covered by a delicate membrane (zona pellucida) external to which may be a cellular membrane (corona radiata), both contributed by the G' 'OV Fig. 27.—Amphibian eggs. A, of frog, soon after laying; B, early larva of frog, just before hatching; C, of the salamander, Cryptobranchus allegheniensis. A and C, approximately actual size; B, enlarged. G, gelatinous layer; L, larva; OV, ovum. {A and B, redrawn from Marshall, "Vertebrate Embryology"; C, after A. M. Reese.) Fertilization. Development is initiated by the "fertilization" of the egg. A spermatozoon penetrates the egg (impregnation) and the sperm chromatin becomes joined with the chromatin of the egg nucleus. nucleus of Pander neck of latebra. 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
