. Cunningham's Text-book of anatomy. Anatomy. THE MALE UEETHEA. 1307 but in it can often be traced as a slight median ridge as far as the uvula vesicae. When followed in the opposite direction the ridge becomes less marked, and can be followed on the urethral wall into the membranous portion of the canal, where it divides into a pair of inconspicuous folds or elevations, which gradually fade out into the urethral wall (Fig. 1026). The curvature and, to a less degree, the length of the prostatic urethra depends upon the amount of distension of the bladder and of the rectum (compare Figs. 989 an
. Cunningham's Text-book of anatomy. Anatomy. THE MALE UEETHEA. 1307 but in it can often be traced as a slight median ridge as far as the uvula vesicae. When followed in the opposite direction the ridge becomes less marked, and can be followed on the urethral wall into the membranous portion of the canal, where it divides into a pair of inconspicuous folds or elevations, which gradually fade out into the urethral wall (Fig. 1026). The curvature and, to a less degree, the length of the prostatic urethra depends upon the amount of distension of the bladder and of the rectum (compare Figs. 989 and 990). Pars Membranacea Urethrae.—The second, or membranous portion, of the ^•--Ureter -Orifice of ureter -•Trigonum vesicae —Uvula vesicae Opening of ejaculatory duct - Utrieulus prostaticus. Bulbo-urethral gland "-~--. Membranous urethra Opening of duet of bulbo- ,'urethral gland -Crus penis Corpus cavernosum penis (cut) Fig. 1026.—Dissection showing the Trigonum Vesicae akd the Posterior Wall or Floor of the Urethra m its Prostatic. Membranous, and the Upper Part of its Cavernous Subdivisions. The canal has been opened up by removing its anterior and upper wail. urethra leads downwards and forwards from the apex of the prostate to the bulbus urethras, and is the shortest and narrowest of the three subdivisions of the canal, its length being somewhat less than half an inch. It begins at the superior fascia of the urogenital diaphragm, a layer of pelvic fascia which lies above the sphincter urethras membranacese muscle. Here it is continuous with the prostatic portion of the urethra. It ends, having pierced the inferior fascia of the uro- genital diaphragm, by becoming continuous with the cavernous portion of the urethra. Placed in front of the rectum, it lies about one inch behind and below the arcuate ligament of the pubis (or sub-pubic ligament). It is surrounded by fibres of the sphincter urethras membranacese muscle, and behind it, on each side of the medi
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
