File:Anatomy, descriptive and surgical (1877) (14785433853).jpg

Identifier: anatomydescripti1877gray (find matches)
Title: Anatomy, descriptive and surgical
Year: 1877 (1870s)
Authors: Gray, Henry, 1825-1861 Holmes, Timothy, 1825-1907
Subjects: Anatomy Human anatomy
Publisher: (London : Longmans, Green)
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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r, and aboutan inch and a half behind the orificeof the urethra. The trigone corre-sponds with the interval at the base ofthe bladder, bounded by the prostatein front, and the vesioulae and vasadeferentia on the sides. Projectingfrom the lower and anterior part of thebladder, into the orifice of the urethra,is a slight elevation of mucous mem-brane, called the uvula vesicce. It isformed by a thickening of the prostate. The arteries supplying, the bladderare the superior, middle, and inferiorvesical, in the male, with additionalbranches from the uterine, in the fe-male. They are all derived from theanterior trunk of the internal iliac. The veins form a complicated plexusround the neck, sides, and base of thebladder, and terminate in the internaliliac vein. The lymphatics accompany the blood-vessels, passing through the glandssuriounding them. ^ The nerves are derived from the hypogastric and sacral plexuses; the formersupplying the upper part of the organ, the latter its base and neck.
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•^ftafi^* ilALE UrETHEA. The urethra extends from the neck of the bladder to the meatus urinarius. Itpresents a double curve in the flaccid state of the penis, but in the erect state it MALE URETHRA. 715 forms only a single curve, the concavity of wliich is directed upwards (fig. 402).Its length varies from eight to nine inches ; and it is divided into three portions,the prostatic, membranous, and spongy, the structure and relations of which areessentially different. The Prostatic jportion is the widest and most dilatable part of the canal. Itpasses through the prostate gland, from its base to the apex, lying nearer its upperthan its lower surface. It is about an inch and a quarter in length ; the form ofthe canal is spindle-shaped, being wider in the middle than at either extremityand narrowest in front, where it joins the membranous portion. A transversesection of the canal in this situation is triangular, the apex directed downwards. Upon the floor of the canal is a narrow longit

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