THIGH 



/./:<;. 



333 



pudic vessels and nerves ; also tile inferior pudenda! nerve, a branch of the small 

 sciatic, distributed to the scrotum and side of the thigh. 



Dissection. Locate the greater sttcro- sciatic ligament. Cut this ligament and 

 find under the same, in the lesser sctcro-sciatic toramen, the main branches of the 

 internal pudic nerve and vessels. You will find two fair-sized branches given off. 

 Tney will both be found to break up into numerous branches. Now carefully 

 trace these branches through the fat of the is< 'Inn-rectal fossa the one to the 

 a HIS, the other forward to the perineum. The branch to the anus is the inferior 

 h.eniorrlioitlitl ; the other is the superficial pcrincal. Notice: (i) These branches 

 are both from the internal pudic ; (2) each divides into cutaneous and muscular 

 branches, for the supply of the muscles and the skin in these regions. The 

 arteries follow the nerves and take the same name. The internal pudic nerve 

 now continues in a canal called Alcock's. This nerve pierces the posterior 

 layer of the triangular ligament (Fig. 233), and gives off the following branches : 

 (i) The dorsal nerve of the penis ; (2) nerve to the bulb ; (3) nerve to the corpus 

 cavernosuin ; (4) superficial pcrineal. This, the dorsal nerve of the penis, is the 

 largest division of the internal pudic nerve. You will find it on the inner sur- 

 face of the ramus of the ischium. It passes behind the superficial transversus 



Superficial dorsal vtin of penis 



/Deep dorsal rf.in 



t Dorsal artery 



>^ 



TUNICA ALBUGINEA 



Vault 



TUNICA ALBUGINEA 



SKIN 



DART03 



SEPTUM PECTINIFORME 



CORPUS CAVERNOSUM 



Fibrous sheath of penis 



Artery 



Artery 

 URETHRA 

 CORPUS SPONGIOSUM 



CORPUS SPONGIOSUM 

 FIG. 231. TRANSVERSK SECTION THROUGH THE BODY OF THE PENIS. 



perinaei muscle, gains the deep perineal space, pierces the anterior layer of the 

 deep perineal fascia, and is distributed to the dorsum of the penis. 



Cms Penis {Dissection of) and Its Muscle the Erector Penis, or Ischio-cavern- 

 OSHS. The muscle covers the crus. Cut through the centre of the muscle in 

 the long diameter and turn the two halves aside. Notice its extensive origin : 

 (i) Tuberosity of ischium, (2) ramus of ischium, (3) surface of the crus. Trace 

 the muscle up to its insertion into the sides and under surface of the crus ; also 

 notice its nerves and vessels. Now cut through the thick, strong capsule of the 

 crus in its long diameter, and examine the erectile tissue of its interior. This 

 tissue is the specific element of the crus, and is called, in common with the 

 remainder of the lateral pyramid of the penis, the corpus cavernosum. Observe 

 the strong origin of the crus from the ischio-pubic ramus. 



Dissection of Accelerator Urince and tke Hitlb. Depress the sound and make 

 the bulb, covered by the accelerator, stand out full. This muscle, as you see, is 

 in the mid-line, in front of the anus. The muscle being on the stretch, you will 

 now see in the middle a raphe separating the two halves. Now cut, with a very 

 sharp knife, through the center of this raphe and turn the muscle outward, and 

 thus expose the bulb. (Fig. 230.) Trace the muscle and note its insertions : ( i) 



