. Kirkes' handbook of physiology . ?Spd. Fig. 488.—Later Stages in Spermatogenesis of the Bull, , Reserve spermatogonium;spg, spermatogonium; , spermatocyte in late synapsis stage; , spermacyte in stage justpreceding the maturation divisions; spd, spermatids in advanced stage of histogenesis, withheads deeply embedded in Sertoli cell. Highly magnified. (After Schoenfeld.) enlargement just before it unites with its fellow. The vas deferens has muscu-lar walls and is lined with ciliated epithelial cells. The Vesiculae Seminales. The seminal vesicles have the appear-ance of outgrow
. Kirkes' handbook of physiology . ?Spd. Fig. 488.—Later Stages in Spermatogenesis of the Bull, , Reserve spermatogonium;spg, spermatogonium; , spermatocyte in late synapsis stage; , spermacyte in stage justpreceding the maturation divisions; spd, spermatids in advanced stage of histogenesis, withheads deeply embedded in Sertoli cell. Highly magnified. (After Schoenfeld.) enlargement just before it unites with its fellow. The vas deferens has muscu-lar walls and is lined with ciliated epithelial cells. The Vesiculae Seminales. The seminal vesicles have the appear-ance of outgrowths from the base of the vasa deferentia. Each vas deferens,just before it enters the prostate gland, through part of which it passes toterminate in the urethra, gives off a side branch which bends back from it atan acute angle. This branch, dilating, variously branching, and pursuing in THE PENIS 681 both itself and its branches a tortuous course, forms the vesicula vesicula is a single-branching convoluted and saccula
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