. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. SPERMATOGENESIS 13 and guinea-pig than in man, the description which follows will be based on what has been described as occurring in these forms. From what is known of the spermatogenesis in man it seems certain that it closely resembles that of these mammals so far as its essential features are concerned. Spermatogenesis.—The spermatozoa are developed from the cells which line the interior of the seminiferous tubules of the testis. The various stages of development cannot all be seen at any
. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. SPERMATOGENESIS 13 and guinea-pig than in man, the description which follows will be based on what has been described as occurring in these forms. From what is known of the spermatogenesis in man it seems certain that it closely resembles that of these mammals so far as its essential features are concerned. Spermatogenesis.—The spermatozoa are developed from the cells which line the interior of the seminiferous tubules of the testis. The various stages of development cannot all be seen at any one part of a tubule, but the formation of the spermatozoa seems to pass. Fig. 6.—Diagram showing Stages of Spermatogenesis as seen in Different Sectors of a Seminiferous Tubule of a Rat. s, Sertoli cell; scl, spermatocyte of the first order; sc2, spermatocyte of the second order; sg, spermatogone; sp, spermatid; sz, spermatozoon.—(Modified from von Lenhossek.) along each tubule in a wave-like manner and the appearances pre- sented at different points of the wave may be represented diagram- matically as in Fig. 6. In the first section of this figure four different generations of cells are represented; above are mature spermatozoa lying in the lumen of the tubule, while next the basement membrane is a series of cells from which a new generation of spermatozoa is about to develop. The cells of this series are of two kinds; the larger one (s). 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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Keywords: ., bookautho, bookcentury1900, bookdecade1910, booksubjectembryology
