File:A treatise on practical anatomy- for students of anatomy and surgery (1891) (14768777321).jpg

Identifier: treatiseonpracti00boen (find matches)
Title: A treatise on practical anatomy: for students of anatomy and surgery
Year: 1891 (1890s)
Authors: Boenning, Henry C
Subjects: Anatomy
Publisher: Philadelphia and London, F. A. Davis
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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is less firmly attached to the subcutaneousstructures; the pigmentation is strongly marked aboutthe anus, which is situated in the median line midwaybetween the perineum and the coccyx. It presentsnumerous folds radiating from the anal aperture. Uponremoving the skin of the perineum the superficial fasciais exposed. This fascia consists of two layers,—super-ficial and deep. The superficial layer is continuous withthe outer layer of the superficial fascia of the abdomen,thighs, and ischio-rectal region, and is loaded with fat.The deep layer of the superficial fascia is continuous withthe deep layer of the superficial fascia of the abdomen.In the perineum it is much thickened and firmly attached THE PERINEUM. 451 to the ascending- rami of the ischia and pubes and investsthe deeper perineal structures. It passes backward to the posterior border of the transversus perinei, aroundwhich it is reflected. It then becomes very much thick-ened and fibrous, and passes forward, being firmly at-
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FiG. 197.—Muscles of the Perineum, with Superficial VesselsAND Nerves. 1, triangular ligament: 2. tendinous centre of the perineum ; 3, transversus perinei;4, ischio-rectal fossa ; 5, inferior pudendal nerve ; 6. transversalis perinei artery; 7, super-ficialis perinei artery; 8, external haemorrhoid artery and nerve. tached to the ascending rami of the ischia, descendingrami of the pubes, and the subpubic ligament. It ispierced by the urethra and the dorsal vein of the penis,and is commonly called the triangular ligament. It is alsoknown as the superficial layer of the deep perineal fascia. 452 PRACTICAL ANATOMY. The deep layer of the deep perineal fascia is a delicatemembranous structure, which is derived from the deep layerof the superficial fascia as it curves around the posteriorborder of the transversus perinei muscles. It passes to the anterior and upper surface of the prostate gland.The perineal fasciae are very simple in their arrange-ment. They inclose the important structur

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