Statistical and Physiological Studies on the Interphasic Growth of the Nucleus

Schreiber, G.

doi:10.2307/1538297

Cited by 22 publications

(1 citation statement)

References 11 publications

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“…Spermatogonial differentiation has essentially two aspects, the fixed number of divisions once encystment occurs and the progressive reduction in cell size with successive cell divisions. This phenomenon seems to be fairly general in animal spermatogenesis with the growth in the size of the spermatogonia between sucessive divisions being only approximately 1.5x (Schreiber 1949, Ortavant 1958, Roosen-Runge and Barlow 1953 an indication of a slight reduction in the length of S-phase. However, it is also clear from Fig.…”

mentioning

confidence: 88%

Germ cell differentiation and kinetics in the testis of Dermestes (Coleoptera).

Al-Taweel

Fox

1983

CYTOLOGIA

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mentioning

confidence: 88%

Germ cell differentiation and kinetics in the testis of Dermestes (Coleoptera).

Al-Taweel

Fox

1983

CYTOLOGIA

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Quantitative studies on spermatogenesis in the albino rat

Roosen‐Runge¹,

Giesel²

1950

Am. J. Anat.

203

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FOURTEEN FIGURESI n the course of experimental investigations on the testis of the rat, it became necessary to acquire a thorough knowledge of the normal process of spermatogenesis. The distribution of the different phases of sperm development was determined in a relatively large amount of material, the spermatogonial arid spermatocytic cell divisions were counted, the cell and nuclear sizes measured, and the relative frequency of the different cell types was recorded. The results revealed certain discrepancies with generally accepted views.A study of the literature on normal spermatogenesis showed that a wealth of observations recorded several decades ago had not been thoroughly reviewed and evaluated for a long time. With this in view, it was decided to restudy the subject and attempt to summarize it in such a way that a normal standard for comparison might be achieved. Such a standard appears desirable at a time when more and more data are being accumulated on the effect of radiation, hormones and carcinogens on the seminiferons tubules.After finishing our observations, we feel that Johannes Miiller 's sentence, " Structura testiculoruni in mammalibus satis cognita est," is as wrong today as it was when published in 1830. W e agree with Benda (1887) whom we quote in translation : "The microscopic exploration of spermatogeiiesis bas been the aim of the most varied investigations; the small amount of success achieved is proof of the great

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Quantitative studies on human spermatogenesis. I. Spermatogonia

Roosen‐Runge

Barlow

1953

Am. J. Anat.

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h'ent?tckg THIRTEEX I"1GURES I n the human testis the cells of the germinal epitlieliuiii are not arranged in coiispicuous, regular patteriis as they are in the majority of mammals, particularly in the rat. On tlie otlier hand, in man, just as in tlie rat, tlie number of cells iii difierent stages of development, the mitotic rates, and the numerical relationships between cell types are obviously expressions of the actual process of spermatogenesis. Tlie problem of recorcling and iiiterpreting tliese quantities is the problem of deciphering a iiumcrical code. This code describes the life of the cells iii very accurate terms, but it is often clifficult to translate it iiito noii-numerical language. What keeps the decipherer at his task is the certain knowledge that iii the sections of the seiiiiriiferous tubules the elements of the story of spermatogenesis are completely preserved whether he uiiderstaiids theni or not, aiid that any day an additional record or a fresh inter-1)rctation may reveal the v-hole. I n our quantitative studies 011 tlic human testis we have so f a r progressed only to the stage of dccocliiig isolated words and hare obtained a crude first approximation of the first chapter of tlie story of spermatocciresis. This first chapter concerns the sperniatogonia.Aided by a grant t o the University of Loiiisvillc from the Kentucky State Student research scholar aided by F a r r n r Cancer Fnnd. Present address :

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Statistical and Physiological Studies on the Interphasic Growth of the Nucleus

Cited by 22 publications

References 11 publications

Germ cell differentiation and kinetics in the testis of Dermestes (Coleoptera).

Germ cell differentiation and kinetics in the testis of Dermestes (Coleoptera).

Quantitative studies on spermatogenesis in the albino rat

Quantitative studies on human spermatogenesis. I. Spermatogonia

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