. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 626 UTERUS AND ITS APPENDAGES. num,fig. 431, i, which marks the commence- ment of that canal. The os externum is bor- dered in front and behind by two smooth lips, whose commissure on either side forms the lateral boundaries of the orifice. The lips constitute the terminations of the anterior and posterior cervical walls respectively. They are accordingly distinguished as the anterior and posterior lips of the os uteri. Their position and form are most conveniently shown in a vertical section of the part (Jig. 426. and 4
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 626 UTERUS AND ITS APPENDAGES. num,fig. 431, i, which marks the commence- ment of that canal. The os externum is bor- dered in front and behind by two smooth lips, whose commissure on either side forms the lateral boundaries of the orifice. The lips constitute the terminations of the anterior and posterior cervical walls respectively. They are accordingly distinguished as the anterior and posterior lips of the os uteri. Their position and form are most conveniently shown in a vertical section of the part (Jig. 426. and 433.). The anterior lip is the smaller; it projects but slightly into the vagina, but it lies at a lower level than the posterior one, on account both of the greater length of the anterior wall of the uterus, and also from the inclination of the upper part of the organ forwards. In an antero-posterior view, the anterior serves to conceal the pos- terior lip, which lies higher in the pelvis, both from the comparative shortness of the pos- terior uterine wall, and also from the tilting forward of the entire organ ; nevertheless the posterior lip makes a greater projection into the vagina, because the walls ot that canal are reflected off at a higher point upon the cervix posteriorly than anteriorly. This un- equal form of the two lips doubtless gave origin to the term os tincae, by which the older anatomists designated the part. In no portion of the uterus is the difference between the nulliparous and multiparous or- gan so marked as in the vaginal portion of the cervix. After the birth of many children, this part becomes much enlarged, soft, flaccid, and of irregular form, with notched margins ; but in the virgin it has uniformly the smooth, even, conical figure just described, while its consistence is nearly that of soft cartilage. External surface.—The uterus, being a hol- low or cavitary organ, possesses both an ex- ternal and an internal surface. The external surface exhib
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