HISTOLOGY 



145 



hematoxylin-eosin stains. The cells rest on a well developed basement 

 membrane. Occasionally the gland may be distended and contain large 

 central cavities into which the tubules and acini open directly. In the lower 

 part of the body a duct lined by cuboidal epithelium is present which anasto- 

 moses with the central ducts of the gland lobules of the tail. The gland 

 lobules of the tail are composed of small alveoli lined by low columnar cells 

 which have dark, round nuclei near the base and dark staining granular 

 basophilic cytoplasm. Small groups of light staining cells similar to those 

 present in the body are intermingled with these cells but in the part of the 

 tail near the urethra these disappear and only the dark staining cells are 

 present (Fig. 74). The long central duct of the lobule nearest to the urethra 

 opens into the urethral diverticulum between the aggregation of the glands 



Tail of bulbo-urethral gland 



Capsule 



Head of bulbo- 

 urethral gland 



Bulbocavernosus 

 muscle 



Bulbo-urethral gland. 



present in its lateral wall and the glands encircling the lumen of the muscular 

 urethra (Fig. 73). 



According to Hall (44) the secretion of Cowper's glands gives a positive 

 reaction when stained specifically for mucin, while the glands of the urethra 

 and the sinus give a negative reaction. 



The penis. — The body of the penis consists of the thin corpus cavernosum 

 urethrae and the two thick corpora cavernosa penis. The corpus caverno- 

 sum urethrae begins at the distal part of the diverticulum of the bulb, where 

 it lies between the crura of the corpora cavernosa penis. It is composed of 

 cavernous spaces surrounded by a layer of dense fibrous connective tissue, 

 the tunica albuginea, the inner surface of which contains a layer of circular 

 smooth muscle fibers. The cavernous spaces are formed by trabeculae con- 



