. Text-book of normal histology: including an account of the development of the tissues and of the organs. Section of testicle of musk-rat, ex-hibiting early stage of spermatogenesis :a, membrana propria; b, zone of pari-etal cells; c, mother-cells; d, sperma-toblasts developing into spermatozoa. Section of testicle of musk-rat, showinglater stage of spermatogenesis : a, mem-brana propria ; b, zone of parietal cells ; c,mother-cells ; d, fan-shaped masses of ele-ments concerned in producing spermato-zoa te). entirely the result of mechanical forces, were formerly regarded asindicating an impor
. Text-book of normal histology: including an account of the development of the tissues and of the organs. Section of testicle of musk-rat, ex-hibiting early stage of spermatogenesis :a, membrana propria; b, zone of pari-etal cells; c, mother-cells; d, sperma-toblasts developing into spermatozoa. Section of testicle of musk-rat, showinglater stage of spermatogenesis : a, mem-brana propria ; b, zone of parietal cells ; c,mother-cells ; d, fan-shaped masses of ele-ments concerned in producing spermato-zoa te). entirely the result of mechanical forces, were formerly regarded asindicating an important rdle on the part of the sustentacular cellsin the production of the spermatozoa, an assumption no longerwarranted by recent investigations. Coincidently with the changesin the general form of the spermatoblasts, the nuclei undergo mod-ifications of great consequence in the development of the futurespermatic elements. The views concerning the genetic relation of the parts of the origi-nal cell to those of the resulting spermatozoon are still at to Henle, La Valette St. George, a
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherphiladelphiajblipp
