28 CHAPTER XVI. 



MALE ORGANS OP GENERATION- 



Testis and epididymis. Man. (p. 11, s. 22 & 24, c. P., m. B.) 

 The testis proper is enclosed in a thick fibrous capsule (tunica 

 albugiriea) ; within this is the simple tubular structure filled with 

 cells. Dorsal] y will be found the epididymis, consisting of large 

 tubules separated by much fibrous tissue, in which are blood 

 vessels. (//) The cells in the tubules can be studied better 

 in the next preparation. The canals of the epididymis are 

 surrounded by plain muscle and contain two or three layers of 

 cells, the innermost of which are columnar with long cilia. 



Testis of Rat, for spermatogenesis. (p. 9, s. 22 & 24, c. P., m. B.) 

 (//) Find T.S. tubules that show sustentacular cells, the ends of 

 which are expanded by spermatoblasts applied to their free ends; 

 in them the heads of the spermatozoa can be seen. Note the 

 flagella of the latter projecting into the lumen. The remaining 

 cells are known as the spermatogenic cells, which vary in shape 

 from spheroidal to squamous, and exhibit various nuclear figures. 

 Between the tubules in the lymph spaces occasional narrow 

 tapering columns of interstitial cells are met with. 



Vas deferens. Dog. (p. 11, s. 22 & 24, c. P., m. B.) (L) and 

 (H) An external coat of plain muscle, to which the mucosal sur- 

 face, covered by ciliated epithelium like that of the epididymis, 

 is loosely attached. 



Prostrate gland. Dog. (p. 11, s. 22 & 24, c. P., m. B.) (L) 

 A lobulated true gland embedded in a fibro-muscular capsule. 

 The racemose acina, with wide lumen, are lined by small cylindrical 

 cells with distinct nuclei. (H) The cytoplasm is finely granular. 



