436 LABORATORY MANUAL OF HUMAN ANATOMY 



Note the amount of pigmentation about the external genitalia and its 

 distribution. 



What is the perineal raphe (raphe perinei) 1 



MALE PERINEUM. 



Pass a sound into the bladder, fill the rectum with cotton or 

 strips of cheese-cloth, and close the anal orifice by sutures. The 

 sound should rest upon the anterior abdominal wall, and the 

 scrotum may be stitched to the prepuce, thus rendering the field 

 of dissection larger; Make the following incisions (Fig. 221) : 



(1) A transverse incision from the anterior extremity of the tuber ischi- 



adicum of one side to that of the other. 



(2) An incision passing in the median raphe from the scrotum in front 



to the tip of the coccyx behind. 



Reflect carefully the four flaps marked out by these incisions. 



FIG. 221. 



Skin incision, and the lithotomy position for the dissection of the perineum. At the left is shown 

 a convenient iron leg-support which clamps on to the edge of the table. The table-top is covered with 

 zinc. 



Superficial Perineal Fascia (Fascia superficialis perinei). (Figs. 222, 

 227-229.) 



Note the general characteristics of this fascia in the regio 

 analis. In the regio urogenitalis it will be found to consist of 



