OF THE PERINEUM IN THE MALE 



443 



muscle of the root of the penis. It is continuous with the dartos of the scrotum, 

 with the fascia of the penis, and with Scarpa's fascia on the anterior surface of the 

 abdomen; on either side it is firmly attached to the outer lip of the ischiopubic 

 ramus. Posieriorly (dorsally) the deep layer curves around the superficial trans- 

 verse perineal muscle to blend with the base of the triangular ligament. The 

 deep (cephalic) surface of this fascia covers the superficial muscles and the super- 

 ficial bloodvessels and nerves of the perineum. From its deep surface a septum 

 which is incomplete in front is given off and divides the adjacent space in two. 



The Central Tendinous Point of the Perineum. This is a fibrous point in the 

 middle line of the pelvic outlet, between the urethra and the rectum, and about 

 half an inch in front of the anus. At this point four muscles converge and are 

 attached viz., the External sphincter ani, the Accelerator urinae, and the two 

 Superficial transverse perineal; so that by the contraction of these muscles, which 

 extend in opposite directions, it serves as a fixed point of support. 



Transversus perinei 

 superficialis. 



GREAT SACRO- 

 SCIATIC LIGAMENT 



Superficial perineal artery. 

 Superficial perineal nerve. 

 Internal pudic nerve. 

 Internal pudic artery. 



FIG. 335. The superficial muscles and vessels of the perineum. 



The Muscles of the Perineum in the Male (Figs. 333, 334, 335). 



Superficial transverse perineal. 

 Accelerator urinae. 



Erector penis. 

 Compressor urethrae. 



The Superficial transverse perineal muscle (m. transversus perinei superficialis) 

 is a narrow muscular slip, which passes more or less transversely across the pelvic 

 outlet. It arises by a small tendon from the inner and fore part of the tuberosity 

 of the ischium, and, passing inward, is inserted into the central tendinous point of 

 the perineum, joining in this situation with the muscle of the opposite side, the 

 External sphincter ani behind, and the Accelerator urinae in front. The base 

 of the triangular ligament lies under cover of this muscle. 



Nerve-supply. The perineal branch of the internal pudic. 



Actions. By their contraction they serve to fix the central tendinous point of the perineum. 



