. Cunningham's Text-book of anatomy. Anatomy. Period of Division during which numerous de- scendants are formed from the primitive germ cell. Period of Growth of oocytes I. Period of Matura- tion during which four descendants are formed from each oocyte I, the mature ovum and three polar bodies (the number of polar b odies is ir- regular). Fig. 9.—Schema of the Developmental History of the Mature Ovum. Primitive germ cell Young spermatocytes \VJ Spermatocyte II Spermatids Spermatozoa. Period of Division dur- ing which many de- scendants are formed from each primitive germ cell. Period of
. Cunningham's Text-book of anatomy. Anatomy. Period of Division during which numerous de- scendants are formed from the primitive germ cell. Period of Growth of oocytes I. Period of Matura- tion during which four descendants are formed from each oocyte I, the mature ovum and three polar bodies (the number of polar b odies is ir- regular). Fig. 9.—Schema of the Developmental History of the Mature Ovum. Primitive germ cell Young spermatocytes \VJ Spermatocyte II Spermatids Spermatozoa. Period of Division dur- ing which many de- scendants are formed from each primitive germ cell. Period of Growth of spermatocytes I. Period of Maturation during which four spermatids are pro- duced from each sper- matocyte I. Period of Transforma- tion during which each spermatid be- comes a spermatozoon. Schema of the Developmental History of Spermatozoa. cell division, to a number which is probably fixed and unchangeable, but which is not definitely known, they begin to increase in size, that is, they enter upon a period of growth, and at this time the female germ cells are called oocytes of the first order, oocytes I, and the male germ cells are called spermatocytes of the first order, sperma- tocytes I. Both the oocytes I and the spermatocytes I possess all the essential. 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 Cunningham, D. J. (Daniel John), 1850-1909; Robinson, Arthur, b. 1862, ed. New York, W. Wood
Size: 1480px × 1688px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
