414 A MANUAL OF ANATOMY. 



(2) The perineal nerve. This - lies below the artery 

 (subject standing). It penetrates the perineal fascia close 

 to the base of the triangular ligament, divides into two 

 branches, the posterior or external and the internal or ante- 

 rior. These branches pass through the perineal triangle 

 and terminate in the scrotum (female, the labium majus). 

 From this nerve muscular branches pass to the transversus 

 perinaei, accelerator urinae (sphincter vaginae), erector penis 

 (clitoris), and filaments also pass to the compressor urethrae, 

 bulb, and mucous membrane of the urethra. 



(3) The dorsal nerve of the penis lies first above the 

 internal pudic artery, continues with the artery into the 

 triangular space, crossing the artery to get below it. It 

 leaves the triangular space with the dorsal artery of the 

 penis, being situated at the outer side of the artery, and 

 terminates in branches to the glans. For the course of 

 the artery see above. 



The nerve supplies in its course branches to the corpus 

 cavernosum, glans, and integument of penis. 



In the female the nerve is smaller, but takes a similar 

 course and distribution. 



DISSECTION. 



Remove the erector penis, accelerator urinse, and transversus perinea; mus- 

 cles. Clean the bulb (corpus spongiosum), crura (corpora cavernosa), and 

 the anterior layer of the triangular ligament. 



The Corpus Spongiosum. (Is described here, but see 

 page 440 for dissection of penis.) Fig. 83. 



This is a cylindrical tube of fascia containing erectile 

 tissue, and traversed through its centre by the urethra. It 

 is placed below and between the two crura, to which it is 

 firmly bound by the sheath of the penis. 



It is dilated at each end ; the anterior dilatation is called 



