The science and art of midwifery (1897) (14576744708)

Identifier: scienidw00lusk (find matches)

Title: The science and art of midwifery

Year: 1897 (1890s)

Authors: Lusk, William Thompson, 1838-1897

Subjects: Obstetrics Women Pathology

Publisher: New York, D. Appleton

Contributing Library: Yale University, Cushing/Whitney Medical Library

Digitizing Sponsor: Open Knowledge Commons and Yale University, Cushing/Whitney Medical Library

Text Appearing Before Image:

vation. The anterior por-tion, or perineal fasciaproper, fills the spacebetween th*1 bis-ischiatic line and the arch of the pubes. It is composedof three layers, as follows: 1. The deep perineal fascia, which coversthe lower surface of the levator ani; i. The median perineal fascia,separated from the former by a narrow interval, and inclosing thepudic vessels and nerves; :>. The superficial perineal fascia whichforms, with the median layer, a shallow compartment in which are lodgedthe superficial muscles of the perinaeum, the bulbs of the vagina, the vulvo-vaginal glands, and the rami of the clitoris. Each one of these organs, except the latter, is, moreover, enveloped in a special sheath,derived from prolongations of the upper surface <»f the aponeurosis. The superficial perineal muscles arc of -light obstetrical importance. They are the constrictor vaginae, the Lschio-cavernosi, and the trans-versi perinaei. The constrictor vaginae consists of two small lateral muscles, situ-

Text Appearing After Image:

Fio. 93. THREE LAYERS OFTHE PERINEAL FASCIA -Antero-posterior section <»f the perineal floor.(Tarnier el ChantreuiL) MECHANISM OF LABOR. L63 ated upon the outer sides of the vestibular bulbs, and surrounding thevulvar orifice. Posteriorly the extremities of the main muscle startfrom the perineal fascia at a point nearly midway between the sphinc-ter ani and the ischia, while a small bundle only is connected with thesphincter ani itself.* Above, the convergent ends separate into asuperficial and deep portion. The superficial portions terminate in atendon which unites them together above the dorsal vein of the clito-ris; the deep portions pass between the upper ends of the bulbs andthe clitoris, and are likewise united by an aponeurosis. The action of the muscle consists chiefly in compressing the veinscrossed by its tendon, and in thus enhancing the turgidity of the erectile CLITORIS. URETHRA.

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1897

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