MUSCLES OF THE MALE GENITAL ORGANS. 355 



stricted part, the cervix, in front of which is the projecting 

 corona glandis. 



SHEATH. 



The sheath is a loose process of integument, which invests the 

 free portion of the penis ; it forms a corrugated sac extending 

 from the scrotum, with which it is continuous, to a varying dis- 

 tance forwards. Anteriorly a loose double fold of the sheath 

 projects, covering the anterior extremity of the penis completely 

 when quiescent ; this is the prepuce, or foreskin, and from it the 

 skin is continued in a modified form over the glans, which it 

 covers, and becomes continuous with the urethral mucous mem- 

 brane ; the skin around the prepuce is so corrugated as to admit 

 of the erection and projection of the penis, during which the 

 corrugations become effaced. 



The inflected fold of the prepuce is void of hair, and resembles 

 that of the glans in structure, being intermediate between that of 

 skin and mucous membrane ; opening on its inner surface are 

 the glandidce odoriferce, which secrete a peculiar odorous matter, 

 and are most numerous about the cervix. The sheath is sus- 

 pended from the abdominal walls by the suspensory ligaments, 

 which are two layers of yellow elastic tissue, passing from the 

 abdominal fascia to the sides of the sheath. 



MUSCLES OF THE MALE GENITAL ORGANS. 



These are as follows: — 



Cremastei-. I Erector penis. 



Accelerator Urinje. | Retractor penis. 



Wilson's muscle. 



Cremaster. — A ribbon-shaped muscle arising from the fascia 

 covering the psoe muscles ; it is attached by cellular tissue to 

 the psoas magnus and iliacus, passes through the inguinal canal, 

 and is distributed over the infundibuliform fascia ; it consists of 

 pale delicate fibres, terminating in slender tendinous slips. It 

 raises and assists in suspending the testicle. 



Accelerator urince. — This may be regarded as single or a pair, 

 consisting of transverse fibres, which arise from the ischial arch, 

 pass along the under surface of the penis, completely investing 

 the urethra, and extend as far forwards as the glans, the fibres 

 mutually blending. This muscle compresses the urethra, and 

 assists in the discharge of urine and semen. 



