1248 



SPLANCHNOLOGY 





The Corpora Cavernosa Penis form the greater part of the substance of the 

 penis. For their anterior three-fourths they lie in intimate apposition with one 

 another, but behind they diverge in the form of two tapering processes, known 

 as the crura, which are firmly connected to the rami of the pubic arch. Traced 

 from behind forward, each crus begins by a blunt-pointed process in front of the 

 tuberosity of the ischium. Just before it meets its fellow it presents a slight enlarge- 

 ment, named by Kobelt the bulb of the corpus cavernosum penis. Beyond this point 

 the crus undergoes a constriction and merges into the corpus cavernosum proper, 



which retains a uniform diameter to its 

 anterior end. Each. corpus cavernosum 

 penis ends abruptly in a rounded ex- 

 tremity some distance from the point of 

 the penis. 



The corpora cavernosa penis are sur- 

 rounded by a strong fibrous envelope 

 consisting of superficial and deep fibers. 

 The superficial fibers are longitudinal in 

 direction, and form a single tube which 

 encloses both corpora; the deep fibers are 

 arranged circularly around each corpus, 

 and form by their junction in the median 

 plane the septum of the penis. This is 

 thick and complete behind, but is imper- 

 fect in front, where it consists of a series 

 of vertical bands arranged like the teeth 

 of a comb ; it is therefore named the sep- 

 tum pectiniforme. 



The Corpus Cavernosum Urethrae 

 (corpus spongiosum) contains the urethra. 



Dorsal veins 



Inf. fascia of 

 Urogenital diaphragm 





FIG. 1154. The constituent cavernous cylinders of 

 the penis. The glans and anterior part of the corpus 

 cavernosum urethrse are detached from the corpora 

 cavernoaa penis and turned to one side. 



Fibrous envelope 



^Corpora cavernosa penis 

 Septum pectiniforme 



Urethra 



Corpus cavernosum ureihrce 



FIG. 1155. Transverse section of the penis. 



Behind, it is expanded to form the urethral bulb, and lies in apposition with the 

 inferior fascia of the urogenital diaphragm, from which it receives a fibrous invest- 

 ment. The urethra enters the bulb nearer to the upper than to the lower surface. 

 On the latter there is a median sulcus, from which a thin fibrous septum projects 

 into the substance of the bulb and divides it imperfectly into two lateral lobes or 

 hemispheres. . . 



The portion of the corpus cavernosum urethra? in front of the bulb lies 

 groove on the under surface of the conjoined corpora cavernosa penis. It is cylin- 

 drical in form and tapers slightly from behind forward. Its anterior end is expanded 

 in the form of an obtuse cone, flattened from above downward. This expansion, 

 termed the glans penis, is moulded on the rounded ends of the corpora cavernosa 



