PUDIC XEEYE. 



671 



are distributed to the tranversalis perinaei, erector penis, accelerator urinae, and 

 compressor urethras. 



c. Slender filaments are sent inwards to the corpus spongiosum urethras ; some of 

 these, before penetrating the erectile tissue, run a considerable distance over its 

 surface. 



Fig. 442. RIGHT SIPE OF THE Fig. 442. 



INTERIOR OP THE MALE PELVIS, 

 WITH THE PRINCIPAL NERVKS 

 DISPLAYED (from Hirschfeld and 

 Leveille). 



The left wall has been removed 

 as far as the sacrum behind and 

 the sympbysis pubis in front; the 

 viscera and the lower part of the 

 levator ani have been removed ; 

 a, the lower part of the aorta ; a', 

 placed on the fifth lumbar ver- 

 tebra, between the two common 

 iliac arteries, of which the left is 

 cut short ; b, the right external 

 iliac artery and vein ; c, the sym- 

 physis pubis ; d, the divided py- 

 riformis muscle, close to the left 

 auricular surface of the sacrum ; 

 e, bulb of the urethra covered by 

 the accelerator urinas muscle ; the 

 membranous part of the urethra 

 cut short is seen passing into it ; 

 1, placed on the crest of the ilium, 

 points to the external cutaneous 

 nerve of the thigh passing over 

 the iliacus muscle ; 2, placed on 

 the psoas muscle, points to the 

 genito-crural nerve ; 3, obturator nerve ; 4, 4, placed on the lumbo-sacral cords ; that of 

 the right side points to the gluteal artery cut short ; 4', the superior gluteal nerve ; 5, 

 placed on the inside of the right sacral plexus, points by four lines to the anterior divisions 

 of the four upper sacral nerves, which, with the lumbo-sacral cord, unite in the plexus ; 

 5', placed on the fifth piece of the sacrum, points to the fifth sacral nerves ; 5", the 

 visceral branches proceeding from the third and fourth sacral nerves ; 6, placed on the 

 lower part of the coccyx, below the coccygeal nerves ; 7, placed on the line of division of 

 the pelvic fascia, points to the nerve of the levator ani muscle ; 8, placed at the lower 

 border of the great sacro-sciatic ligament, points to the cutaneous nerves of the anus ; 9, 

 nerve of the obturator internus ; 10, the pudic nerve; 10', is placed above the muscular 

 branches of the perineal nerve ; 10", the anterior and posterior superficial perineal nerves, 

 and on the scrotum the distribution of these nerves and the inferior pudendal nerve ; 11, 

 the right dorsal nerve of the penis; IT, the nerve on the left crus penis which is cut 

 short ; 12, the continuation of the lesser sciatic nerve on the back of the thigh ; 12', the 

 inferior pudendal branch ; 13, placed on the transverse process of the fifth lumbar ver- 

 tebra, marks the lowest lumbar sympathetic ganglion ; 14, placed on the body of the first 

 piece of the sacrum, points to the upper sacral sympathetic ganglia ; between 14 and 6, 

 are seen the remaining ganglia and sympathetic nervous cords, as well as their union with 

 the sacral and coccygeal nerves, and at 6, the lowest ganglion or ganglion impar. 



B. The dorsal nerve of the penis, the upper division of the pudic nerve, 

 accompanies the pudic artery in its course between the layers of the deep 

 perinseal or subptibic fascia, and afterwards through the suspensory 

 ligament, to reach the dorsum of the penis, along which it passes as far as 

 the glands, where it divides into filaments for the supply of that part. On 



