THE PENIS. 253 



of a triangular form, which is attached by its apex to the front of ligament of 

 the symphysis pubis. Widening below, it is fixed to the upper pe 

 surface of the body of the penis, and is prolonged for some distance ments- 

 on the organ. Perforating the ligament at its junction with the contains 

 penis are the dorsal vessels and nerves. nerves 3 a d 



The DORSAL ARTERY, on each side, pierces the suspensory liga- Dorsal 

 ment, and extends forwards to the glans, where it ends in many artery of 

 branches for that structure : in its course the vessel supplies the 

 integuments and branches to the body of the penis. 



The DORSAL VEIN is a single trunk, and commences by numerous Dorsal vein 

 branches from the glans penis and the prepuce. It runs backwards, prostatic 

 between the two arteries, through the suspensory ligament, and then P lexus - 

 through a special opening below the sub-pubic ligament, to join the 

 prostatic plexus of veins. The vein receives branches from the 

 erectile structure and from the integuments of the penis. 



Each DORSAL NERVE takes the same course as the artery, and ends Dorsal nerve 

 like it in numerous branches to the glans penis. It furnishes twigs of pudlc- 

 to the corpus cavernosum penis, and other offsets to the integuments 

 of the dorsum, sides, and prepuce of the penis. 



In the female these vessels and nerves are much smaller than in Vessels on 

 the male, and occupy the upper surface of the clitoris the organ clltons> 

 that represents the penis. 



The BODY OF THE PENIS is rather prismatic in shape. The upper forms and 

 surface is slightly grooved along the middle line ; and the lower a 

 rounded border is formed by the corpus spongiosum, which is 

 received into a groove between the corpora cavernosa. 



The coitus spongiosum urethras encloses the urethral canal beyond Corpus 

 the triangular ligament, and forms the head of the penis. It is a spon 

 vascular and erectile texture, like the corpora cavernosa, but is 

 much less strong. Commencing posteriorly in the bulb, it extends 

 forwards around the urethra to the extremity of the penis, where it sweiTs'into" 

 swells into the conical glans penis. and the*' 



The glans penis is somewhat conical in form, and covers the trim- 2JJJ* 1 nfa 

 cated ends of the corpora cavernosa. Its base is directed backwards, 

 and is marked by a slightly prominent border the corona glandis; 

 it is sloped obliquely along the under aspect, from the apex to the 

 urinarius base. In the apex is the vertical slit (meatus) in which 

 the urethral canal terminates, and below that aperture is an excava- 

 tion which holds the fold of skin named the frcenum prceputii. 



Direction. The student should be careful not to damage the 

 urethra, as it will be examined at a later stage. 



PARTS CUT IN THE LATERAL OPERATION OF LITHOTOMY. This Parts cut in 

 operation for stone in the bladder may be divided into three stages, ht 

 viz., cutting down to the urethra, opening the canal, and slitting 

 the tube and the neck of the bladder. In the external incision the in cutting 

 knife is entered near the middle line of the perineum, one inch in 

 front of the anu=, and is drawn backwards on the left side as far 

 as midway between the ischial tuberosity and the anus. The skin 

 and fat, the transverse perineal muscle and artery, the inferior 



