File:Quain's elements of anatomy (1882) (14761372764).jpg

Identifier: quainselementsofquai02 (find matches)
Title: Quain's elements of anatomy
Year: 1882 (1880s)
Authors: Quain, Jones, 1796-1865 Thomson, Allen, 1809-1884 Sharpey-Schäfer, E. A. (Edward Albert), Sir, 1850-1935, ed Thane, George Dancer, 1850-1930
Subjects: Human anatomy Anatomy
Publisher: New York : William Wood and co.
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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aginiscontains some well-marked erectile and plain muscular tissue, and it hasbeen supposed that this eminence, when distended with blood, may offeran obstacle to the passage of the semen backwards into the bladder. 2. The membranous portion of the urethra comprises the part be-tween the apex of the prostate and the bulb of the corpus spongiosum.It is three quarters of an inch long, but about half an inch of its posterior THE MALE UEETHEA. 679 surface is covered by the bulb of the corpus cavernosum which projectsbackwards over it. This membranous portion is the narrowest division of the urethra. In the middle its diameter is one-fifth of an inch : atthe end not quite so much. It is placed beneath the pubic arch, theanterior concave surface being distant nearly an inch from the bone,leaving an interval, occupied by the dorsal vessels and nerves of thepenis, by areolar tissue, and some muscular fibres. Its lower convexsurface is turned towards the perineeum, opposite the point of meeting
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Fig. 590.—Sagittal section op the commencement of the urethra passing a littlk TO THE LEFT OF THE MIDDLE LINE (Sappej). 1, Symiiliysis pubis ;■ 2, bladder ; 3, 4, section of its wall; 5, pubo-prostatic ligament;6 to 11, different parts of the prostate ; 12, left vas deferens ; 13, left seminal vesicle ;14, ejaculatory duct, opening on the veru montanum ; 15, wall of the membranous partof the urethra; 16, areolar tissue with venous plexus, into which the vena dorsalispenis, 17, is seen passing : 18, triangular ligament; 19, bulb of the corpus spongiosum;20, Cowpers gland ; 21, its duct; 22, cavity of the rectum ; 23, its walls ; 24, anus;25, areolar and muscular tissue lying between the rectum and bulb ; 26, septumscroti; 27, corpus spongiosum urethree. of the transverse muscles ; it is separated by an interval fi-om the lastpart of the rectum. About y\j-th of an inch in front of the prostateit emerges from between the anterior borders of the levatores ani, andpasses through the de

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