Quain's elements of anatomy . from the neck of the bladder to theextremity of the penis. Its total length is about eight inches and a half,but varies much according to the length of the penis, and the conditionof that organ. Except during the passage of urine or semen the canal isa mere cleft elongated transversely and with the superior and inferior-parts of the wall in contact (see fig. 584, ii). Its diameter when moderatelydistended varies at diflerent parts of its extent, as will be stated moreparticularly hereafter. The tube consists of a continuous mucousmembrane, supported by an outer la
Quain's elements of anatomy . from the neck of the bladder to theextremity of the penis. Its total length is about eight inches and a half,but varies much according to the length of the penis, and the conditionof that organ. Except during the passage of urine or semen the canal isa mere cleft elongated transversely and with the superior and inferior-parts of the wall in contact (see fig. 584, ii). Its diameter when moderatelydistended varies at diflerent parts of its extent, as will be stated moreparticularly hereafter. The tube consists of a continuous mucousmembrane, supported by an outer layer of submucous tissue connectingit with the several parts through which it passes. In the submucoustissue there are, throughout the whole extent of the urethra, two layers STRUCTUEE OP COEPUS SPONGIOSUM. 677 of plain muscular fibres, the inner fibres disposed longitudinally, and theouter in a circular direction. The urethra is described under the threedivisions of the prostatic, iimiibranous, and simncjy portions. Fis. Fig. 589.—The lower part op the bladder and the prostatic, membranous, and BULBOUS parts OP THE URETHRA OPENED FROM ABOVE. (Allen ThomSOn.) A portion of the wall of the bladder and the upper part of the prostate gland have beenremoved, the corpora cavernosa penis have been separated in the middle line and turnedto the side, and the lu-ethra has been slit up ; the bulb is left entire below, and uponand behind it the glands of Cowper with their ducts have been exposed, t, placed in themiddle of the trigonum vesicae ; u, u, oblique apertures of the ureters ; from these anelevation of the wall of the bladder is shown running down to v, v, the uvula vesicae ; I, thelongitudinal muscular fibres of the bladder passing down upon the ijrostate ; s v, thecircular fibres of the sphincter; p, the glandular x^art of the prostate ; p, the prostaticportion of the urethra ; from the uvula vesicae a median ridge is seen descending to thecaput gallinagiuis, in which s in
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Keywords: ., boo, bookcentury1800, booksubjectanatomy, booksubjecthumananatomy
