234 MICROSCOPIC AS ATOMY OF THE ORGASS. 



layer of ciliated epithelium, lies between the blood-vessels of 

 the spermatic cord in the neighborhood of the testis. In the 

 epididymis we distinguish side branches, the ductuli aberrantes. 

 These are spoken of as the ductulus aberrans Halleri (which is 

 a branch of the vafc epididymis), the ductulus aberrans capitis 

 epididymis, arid the ductulus aberrans in the rete testis. All 

 these end blindly, are lined with ciliated cylindrical epithelium, 

 and arise from the Wolffian body. 



The appendix testis or hydatid of Morgagni, is made up 

 usually of a vascular connective tissue and lined with ciliated 

 epithelium. It often has a stalk of considerable length, and 

 may itself be a large sac containing fluid. It is situated in the 

 upper part of the head of the epididymis. It is probably a 

 rudiment of Miiller's duct. The appendix epididymis is a 

 somewhat similar structure similarly situated, and lined with 

 small cubical epithelial cells. It is usually a saccular structure, 

 and is supposed to be a vestige of the Wolffian body. 



C. Accessory Glands of the Male Sexual Organ. 

 1. Prostate. 



The prostate consists of from thirty to fifty branched tubular 

 glands converging toward the base of the colliculus seminalis. 

 Many ducts join with one another and open into the ureter in 

 the region of the colliculus seminalis by from fifteen to thirty 

 orifices. The epithelium lining the tubules is cubical, and only 

 in the larger ducts do we meet with transitional epithelium, 

 such as is present in the prostatic urethra. The secretion of 

 the prostate succus prostaticus is a serous fluid containing no 

 mucus. In old individuals the gland tubules form so-called 

 prostatic stones, round concentrically built-up structures about 

 1 mm. in diameter, very hard, and often calcified. 



A considerable part of the prostate is formed by the inter- 

 stitial tissue between the glands. This is made up of a firm 

 connective tissue containing many bundles of smooth muscle 

 cells. It forms at the outer surface of the organ a well-devel- 

 oped capsule, and on the inner surface next the urethra it is 



