The principles and practice of obstetrics . c. The Cavity of the Neck. it. The Orifices of the FallopianTubes, n. The Arbor Vitae. o. The Os Oteri Internum. «. The Su-perior Border of the Cavity of the Body. exhibits two cavities, communicating one with theother. The superior one is that of the body of the THE UTEEUS. 41 uterus, and is of a triangular form—two sides arelateral, and one superior and transverse. They are notperfectly straight, but in the unimpregnated conditioneach is convex internally, and measures about oneinch in length. Of the three angles, the inferior isat the superior ext
The principles and practice of obstetrics . c. The Cavity of the Neck. it. The Orifices of the FallopianTubes, n. The Arbor Vitae. o. The Os Oteri Internum. «. The Su-perior Border of the Cavity of the Body. exhibits two cavities, communicating one with theother. The superior one is that of the body of the THE UTEEUS. 41 uterus, and is of a triangular form—two sides arelateral, and one superior and transverse. They are notperfectly straight, but in the unimpregnated conditioneach is convex internally, and measures about oneinch in length. Of the three angles, the inferior isat the superior extremity of the cervix; it is pervious,and forms the communication between the cavity ofthe body and that of the neck; it is called the osuteri internum; it is somewhat contracted, and, inthe living subject, very sensitive. The two supe-rior angles of the cavity of the uterus communicatewith the Fallopian tubes, with which they are con-tinuous; they are very small, and are situated atthe superior horns or cornua of the uterus. The Fig. Antero-Posterior Section op the Uterus.—aBody. c. The Neck. d. The Os Uteri Externum. The Fundus, b. Thee. The Vagina. anterior and posterior surfaces of this cavity are incontact; hence, an incision from the anterior to the pos-terior surface of the uterus, exhibits a mere line of de-marcation between these two surfaces. The cavity of the neck is barrel-shaped, being con-tracted at each extremity, and convex in the middle;nevertheless, it is also somewhat flattened, so that anantero-posterior incision exhibits very little space inthis direction; while transversely, its greatest diam-eter is about four lines. It communicates above withthe cavity of the uterus by the os uteri internum, andwith the vagina below by the os uteri externum. Both of these cavities are lined by a delicate mucousmembrane, reflected from the vagina internally to theFallopian tubes, into which it passes. This lining mem-brane in the neck of the uterus is thrown into
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