440 



LABORATORY MANUAL OF HUMAN ANATOMY 



T. 



Nerves. (Fig. 225.) 



(a) Nerve of the perineum (N. perinei). 



(aa) Posterior scrotal nerves (Nn. scrotales posteriores) . 



(b) Perineal branches of posterior cutaneous nerve of thigh (0. 



branches of small sciatic). 

 Lymphatics. (Vide Toldt, Fig. 1092.) 



What is the course of the lymphatics in this region? Are there 

 any lymph-nodes? 



FIG. 225. 



Kami perineal. N. cutan 

 femor. post. 



Nn. clunium inferiores 



N. ischiocavernosus 



Kami perineales N. 



cutan. fern. post. 

 -M. transver. perinei 



superf. 

 N. pudendus 



N. cut. N. fern. post. 

 M. levator ani 

 M. glutaeus max. 



v : ^'^LM. sphincter ani 

 ext. 



Perineal nerves in the male (after Paulet). (From Poirier et Charpy, Trait< d'Anat. hum., Paris, 1899, 



t. iii, 3, p. 1154, Fig. 593.) 



Dissect away carefully the skin covering the penis, avoiding 

 vessels and nerves. Observe 



(a) Root of penis (radix, penis). 



(b) Crura of penis (crura penis). 



Use models in this study. Note the divergence of the crura 

 behind, also their exact relations to the ischiadic and pubic rami. 

 What is their relation to the urogenital diaphragm? 



(c) Cavernous bodies of penis (corpora cavernosa penis). 



(d) Cavernous body of urethra (corpus cavernosum urethrae). 



This body may be exposed if the M. bulbocavernosus is incised 

 in the median line and carefully reflected. Note how it expands 

 posteriorly to form the 



(e) Bulb of urethra (bulbus urethrae). 



(ea) Hemispheres of bulb of urethra (hemisphaeria bulbi ure- 



thrae). 



(eb) Septum of bulb of urethra (septum bulbi urethrae). 



