i88 



ABDOMEN 



on the lateral side, by the long perineal branch of the posterior 

 cutaneous nerve of the thigh, which pierces Colics' fascia about 

 25 mm. (one inch) anterior to the tuberosity of the ischium. 

 Secure that nerve and follow it forwards to its termination, but 

 do not interfere with it in the thigh, where it belongs to the 

 dissector of the inferior extremity. 



For the detailed description of the vessels and nerves 

 exposed by the above dissection the dissectors must refer to 



M. ischio-cavernosus 



M. bulbo-cavernosus 

 M. ischio-cavernosus 



M. transversus 

 perinei superficial 



M. levator ani 



M. glutauis maximus 



M. sphincter ani externus 

 FIG. 89. Muscles of the Female Perineum (Peter Thompson). 



p. 162, where the corresponding structures are described in 

 the male. 



Dissection. Divide the posterior labial nerves and the 

 accompanying vessels near their anterior ends and turn them 

 backwards ; then clean the superficial perineal muscles. They 

 are, on each side (i) the ischio-cavernosus, (2) the bulbo- 

 cavernosus, and (3) the superficial transverse muscle. The 

 ischio-cavernosus lies along the pubic arch on the surface of the 

 crus of the clitoris. The bulbo-cavernosus is placed medially 

 on the surface of the bulb of the vestibule which lies along the 

 sides of the vestibule. The superficial transverse muscle runs 

 from the posterior end of the ischio-cavernosus to the central 

 point of the perineum, which lies in the median plane midway 

 between the vaginal and anal orifices. 



