. Text-book of normal histology: including an account of the development of the tissues and of the organs. Section of testicle of musk-rat, dis-playing still later stage of spermato-genesis : spermatozoa are now welladvanced and form radially-arrangedmasses (d); other letters as in pre-ceding Section of human testicle, including partsof three tubules (i) and intervening connectivetissue; within the latter lies a group of inter-stitial cells {{). cate projection or spine grows into, and, later, through, the innerclear half of the nucleus ; this outgrowth is the first indication ofthe
. Text-book of normal histology: including an account of the development of the tissues and of the organs. Section of testicle of musk-rat, dis-playing still later stage of spermato-genesis : spermatozoa are now welladvanced and form radially-arrangedmasses (d); other letters as in pre-ceding Section of human testicle, including partsof three tubules (i) and intervening connectivetissue; within the latter lies a group of inter-stitial cells {{). cate projection or spine grows into, and, later, through, the innerclear half of the nucleus ; this outgrowth is the first indication ofthe future tail of the spermatic element. As the result of the local-ization of the chromatin within the central part of the nucleus, thelatter now exhibits three zones : an outer clear cap at the fore-pole, a narrow middle zone filled with chromatin, from whichthe developing tail-fibre extends, and an inner clear, area whichreaches as far as the hind-pole and is pierced by the tail. In thesethree nuclear zones the divisions of the future mature spermatozoonare indicated: the outer clear cap becomes the homogeneous head,the middle chromatin band produces the tail and the middle-piece, 212 NORMAL HISTOLOCxY Fig. 257. and the inner clear zone forms the deUcate hyaline envelope invest-ing the middle-p
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherphiladelphiajblipp
