CORPORA CAVERNOSA. 



179 



Cowper' s glands, situated beneath the membranous urethra 

 between the layers of the deep perineal fascia, are two small 

 racemose glands emptying into the urethra. The alveoli are 

 lined with columnar epithelium apparently of the mucous 

 type, though the purpose of the secretion is not well under- 

 stood. 



The Penis. 



The penis consists of three longitudinal cylindrical com- 

 partments surrounded by fibrous sheaths two corpora caver- 

 nosa filled with erectile tissue, and the corpus spongiosum con- 

 taining erectile tissue and the urethra all covered with skin 



FIG. 69. 



Cavernous or erectile tissue of penis (Cadiat). a, fibrous trabeculae ; b, cavernous 

 sinuses ; c, smooth muscle in cross-section. 



and subcutaneous tissue. The skin is thin and movable. The 

 subcutaneous areolar tissue is free from fat, contains vascular 

 and nerve trunks, and by its looseness allows the skin much 

 play. 



The corpora cavernosa are surrounded by a common sheath 

 of dense fibrous tissue, the tunica albuguinea. Each corpus 



