PERINEAL MUSCLES, 



337 



the penis is by that means more Fig. 86.* 



completely distended. The erec- 

 tores seem, likewise, to keep the 

 penis in its proper direction. 



2. Accelerator Urince seu Ejac- 

 ulator Seminis. 



Arises, fleshy, from the sphinc- 

 ter ani and membranous part of 

 the urethra ; and tendinous, from 

 the crus, nearly as far forwards 

 as the beginning of the corpus 

 cavernosum penis : the inferior 

 fibres run more transversely ; and 

 the superior descend in an ob- 

 lique direction. 



Inserted into a line in the middle of the bulb where it joins 

 with its fellow, by which the bulb is completely enclosed. 



Use. To drive the urine or semen forwards ; and, by grasping 

 the bulb of the urethra, to push the blood towards the corpus 

 cavernosum and the glans, by which these parts are distended. 



3. Transversus Perinei, 



Arises from the tough fatty membrane that covers the tube- 

 rosity of the os ischium ; from thence it runs transversely 

 inwards, and is 



* Cremaster, from Sir A, Cooper's work. 0, Rectus muscle, b, Descending 

 portion of the fascia superticialis. c, The internal oblique, d. Conjoined ten- 

 dons, e, The descending fibres of oblique. /, Point of insertion into the pubis. 

 g, Ascending fibres, h, One of the reversed arches. 



The formation of the cremaster, appears to be completed by the testicle in 

 its descent, as Scarpa, Cloquet, Cooper, Velpeau, and Todd admit. Prior to 

 the descent, the gubernaculnm testis occupies the inguinal canal, and is covered 

 by the fibres of the cremaster which divide inferiorly into three processes ac- 

 cording to Mr. Curling. The outer process which is the largest running to be 

 inserted on Poupart's ligament, the middle one to the bottom of the scrotum, 

 where it joins the dartos, the internal one to the os pubis and the sheath of the 

 rectus muscle. The testis is drawn down by the successive action of these 

 muscular bands of the gubernaculum, the testis as stated by Mr. Curling is 

 drawn first into the inguinal canal, then through the external abdominal ring. 

 and finally down into the bottom of the scrotal pouch, the fibres of the cremas- 

 ter remaining subsequently as a muscular envelop surrounding the g'and and 

 the front of the cord. 



29 



