DISSECTING MANUAL. 



runs on the dorsum of the penis (or clitoris) to supply the skin 

 of the distal two-thirds. A branch (nerve to the cor^ms caver- 

 nosum) runs through the triangular ligament to the erectile 

 tissue of the crus and corpus cavernosum. [660] 



SYMPATHETIC SYSTEM. 



Lumbar Part of Cord. This lies on the bodies of the verte- 

 brae, internal to the Psoas, and presents from four to eight 

 ganglia; it is continuous with the thoracic and sacral portions. 

 White rami communicantes pass to it from the first two or 

 three lumbar nerves ; gray rami communicantes pass from it to 

 the anterior divisions of the lumbar nerves; all these rami 

 pass under the Psoas. Numerous small branches go to the 

 abdominal aorta and aortic plexus. [710] 



Sacral Part of Cord. This lies on the sacrum, internal to 

 the foramina; it is continuous with the lumbar cord above and 

 ends below, over the coccyx, in a plexiform (parietal branches} 

 union with the opposite cord, the two parts being often con- 

 nected by the coccygeal ganglion (ganglion impar). It usually 

 presents four ganglia. It receives no white rami communi- 

 cantes, but gray rami communicantes pass from it to the an- 

 terior divisions of the sacral and coccygeal nerves. Visceral 

 branches from its upper part join the pelvic plexus. [711] 



Plexuses. Taken together there are three, the solar, hypo- 

 gastric, and pelvic. They are formed by peripheral branches 

 of the lower thoracic, lumbar, and upper sacral parts of the 

 gangliated cord, and supply the abdominal and pelvic viscera 

 and vessels. They are connected with the central nervous 

 system through its visceral branches (white rami communi- 

 cantes). The visceral branches of the middle sacral nerves 

 pass directly to the plexuses, but those of the lower thoracic 

 and upper lumbar nerves pass indirectly, first joining the gan- 

 gliated cord and then running in (chiefly) the splanchnic nerves 

 and (partly) the lumbar part of the cord. [712] 



Solar Plexus. This lies on the posterior abdominal wall, 



[204] 



