1008 



mi, C. V. SOXNTAG ON THE TELVIC MlISCLElii 



behind the superficial part. The deep part of the muscle (S.A.D.) 

 runs round the gut from the central point of the perineum in 

 front to the ano-coccygeal raphe behind ; its deep aspect is in 

 contact with, and receives fibres from, tlie levator ani. 



'Transverse Perineal Muscles : — In the t\TO male Chimpanzees, 

 as in the female animal already descriljed by me, there is no trace 

 of the supei^ficial or deep transverse perineal muscles. 



The hulbo-cavernosus (text-fig. 63, B.C.) arises from the median 

 venti'al i\aphe on the bulb and corpus spongiosum, and the fibres 

 run ventro-dorsally. The posteiior fibres completely encircle the 

 bulb, are continuous with the fibres of the opposite muscle, and 



Text-figure 64. 

 c.s. 



The levator ani. C.C: corpus caveniosum ; C.S: corpus spongiosum; T.L.U ; 

 upwardly curved base of the triangular ligament. Other letters in text. 



are inserted into the triangular ligament. The two muscles are 

 separate distal to the bulb, and gradually leave the ventral sur- 

 face of the corpus spongiosum ; they are inserted by small slips 

 into the fascia on the doi-sum of the corpora cavernosa.. 



The ischiO'Cavernosiis (text-fig. Gl"!, 1.-0.) iwisos from the iunei- 

 aspect of the lower end of the ischial ramus, the inner aspect 

 of the tuber ischii and the great sacro-sciatic ligament. It is 

 inserted into the under surface of the crus penis and the outer 

 and dorsal aspects of the corpus cavernosum. 



When the penile muscles, which are in contact, are removed, 



