File:The science and art of midwifery (1897) (14576745388).jpg

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

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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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CONSTRICTOR TRANSVERSUS Fig. 94.—Muscles of the perinaeum. (Henle.) apparatus. It is in no sense a sphincter muscle, though, by pressingthe turgid bulbs inward, it may narrow the vestibule of the vagina. The ischio-cavernosi muscles form a fibro-museular sheath about thecrura of the clitoris. They are united together above by an aponeuro-sis which crosses the posterior extremity of the body of the clitoris.During sexual excitement these muscles are capable not only of com-* Luschka, Anatomic des menschlichen Beckens, p. :*!)!). i»;4 LABOR. pressing the crura, thereby forcing the blood toward the body of theclitoris, but, through the pressure exerted by the aponeurosis upon thedorsal vein, they help to retard the return of the blood from the turges- ceni organ. The transversi perimvi muscles are small, triangular, flattenedmuscles, which pass from the inner sides of the ischia, underneath theconstrictor muscle, to the sides of the vagina and rectum. When theperinaeum is lacerated, t

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