ABDOMEN AND PELVIS 533 



VEINS OF THE PELVIS. 



Study the following: 



Hypogastric Vein (V. hypogastrica). (Vide Spalteholz, Figs. 500, 



50I-) 



Many of the veins which are radicles of the vena hypogas- 

 trica have been met with in early dissections. They may be 

 reviewed to advantage : 



(a) Internal pudendal vein (V. pudenda interna). 



(aa) Deep veins of penis (Vv. profundae penis). 



(ab) Urethral veins (Vv. urethrales). 



(ac) Veins of bulb of urethra (Vv. bulbi urethrae). 



(ad) Posterior scrotal veins (Vv. scrotales posteriores) . 

 In the female : 



(ae) Inferior hemorrhoidal veins (Vv. haemorrhoidales inferiores). 



(af) Deep veins of clitoris (Vv. profundae clitoridis). 



(ag) Veins of bulb of vestibule of vagina (Vv. bulbi vestibuli 



[vaginae]), 

 (ah) Posterior labial veins (Vv. labiales posteriores). 



(b) Internal hemorrhoidal plexus (plexus haemorrhoidalis internus) f 



which will be seen in the dissection of the rectal wall. The veins 

 pierce the rectal wall and form the external hemorrhoidal plexus 

 (plexus haemorrhoidalis externus). What veins arise from this 

 latter plexus, and into what larger veins do they empty? 



(c) Vesical plexus (plexus vesicalis). (Vide Spalteholz, Figs. 500, 503, 



677.) 



Determine the relation of this plexus to the bladder and to the 

 prostate. By what veins is it drained? 



(d) Pudendal plexus (plexus pudendalis). 



What is the relation of the dorsal vein of the penis to this 

 plexus? What course must this vein pursue to reach it? 



(e) Utero vaginal plexus (plexus uterovaginalis) . 



Middle Sacral Vein (V. sacralis media). 



Determine its relation to the Vv. sacrales laterales. What is 

 the anterior sacral plexus (plexus sacralis anterior) ? 



MUSCLES AND NERVES OF THE PELVIS. 



Muscles of the Pelvic Diaphragm. (Vide Fig. 287, and Spalteholz, 



Figs. 670, 671.) 



Clean away all that remains of the fascia diaphragmatis 

 pelvis superior and study the muscles of the pelvic diaphragm. 

 In cleaning the coccygeus muscles avoid injury to the fifth sacral 



