. The science and art of midwifery . imated by Dickinson at ten pounds, rising in certain cases totwenty-seven The levator measures from j to § of an inch in thickness. It be-comes, however, bypertrophied during pregnancy. The muscular floor of the pelvis is rendered complete by the coccy-geus muscle, situated between the levator and the pyriformis, and infront of the small sciatic ligament. Idle base is attached to the sides Dickinson, Studies of the Levator Am Muscle, Am. .lour, obstetrics. Sept.,1880, p. 900. To this article I am indebted for the changes made In the presenttext. ME
. The science and art of midwifery . imated by Dickinson at ten pounds, rising in certain cases totwenty-seven The levator measures from j to § of an inch in thickness. It be-comes, however, bypertrophied during pregnancy. The muscular floor of the pelvis is rendered complete by the coccy-geus muscle, situated between the levator and the pyriformis, and infront of the small sciatic ligament. Idle base is attached to the sides Dickinson, Studies of the Levator Am Muscle, Am. .lour, obstetrics. Sept.,1880, p. 900. To this article I am indebted for the changes made In the presenttext. MECHANISM OF LABOR. [6] of the coccyx and the lower extremity of the sacrum ; the insertion ofthe apex is at the spine of the ischium. In caudate animals the coccy-geua is strongly developed, and enables them to move the tail upper surface of the levator-ani and coccygeal muscles is con-cave. The muscles themselves arc flattened, and alone are capable ofaffording but feeble support to the superimposed viscera. They Fin. 92.—The levator (L) seen from the side \rhen the ischium is removed. The lower bundlesare the strong and heavy ones. The sphincter ani is shows surrounding the anus and thecoccygeus is faintly indicated. I Redrawn from Luschka by Dickinsi »n. however, above closely attached to the strong tissues of the internalpelvic fascia, which possess the qualities of elasticity and toughness. The internal pelvic fascia is attached to the upper border of thesuperior strait, where it meets the fascia which lines the iliac fossa?and the transverse fascia of the abdominal walls. It covers the pyri-formis and the upper half of the obturator muscles. In front it de-scends from the symphysis to the neck of the bladder, and forms thepubo-vesical ligament. From the linea tenninalis to the arena ten-11 L62 LABOR. dineus the fascia upon the side walls is firmly attached to the perios-teum. The tendinous arch marks the line at which the fascia leavesthe pelvic wal
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