Manual of gynecology / by D. Berry Hart and A.H. Freeland Barbour.

  • Hart, D. Berry (David Berry), 1851-1920.
Date:
1905
Catalogue details

Licence: Public Domain Mark

Credit: Manual of gynecology / by D. Berry Hart and A.H. Freeland Barbour. Source: Wellcome Collection.

Provider: This material has been provided by the Francis A. Countway Library of Medicine, through the Medical Heritage Library. The original may be consulted at the Francis A. Countway Library of Medicine, Harvard Medical School.

    57/806 (page 19)
    The folds of the arbor vitse sometimes cease at this point, but may pass above it or in multiparas may end below it. Kiistner also alleges that for \ cm. (i in.) below the os internum as defined by him the cervical substance and mucous membrane are like that of the uterine body, and that this special part of the cervical canal participates in the menstrual and pregnancy changes : and he therefore terms this the inferior uterine segment, and speaks of a cervical decidua. The os internum is believed by some to be at the level where the peritoneum passes on to the bladder. While the two great divisions of the uterus are the body and cervix, Lower it is of importance to keep in mind that in pregnancy we distinguish a ^e^ment Fig. 14. Coronal Section of Uterus (Kiistner). a. a. Uterine opening of Fallopian tubes ; c. i. Os Internum ; o. e. Os externum. special part of the body as the Lower Uterine Segment. It has the following characteristics: the peritoneum is loosely attached over it, the muscular wall thinner there and the muscular bundles more separ- able ; further, it plays in labour a passive role, and comes to be marked off from the part above by a thickening in the wall known as the contraction or retraction ring. We may show the relations of all the divisions in the following scheme :— Upper portion (upper two-thirds). Lower Uterine Segment (lower one-third). supravaginal portion. intermediate ,, vaginal ,, Kiistner, as we have seen, speaks of the inferior uterine segment as cervical in origin. Body (in pregnancy) Cervix