Читать книгу Mother, Nurse and Infant - S. P. Sackett - Страница 21

This is defined by the LINEO ILIO PECTINEA, which marks the boundary of the true and false pelvis, and this superior strait is the entrance of the lesser pelvis. Its form has been variously described as being oval, heart-shaped, and triangular. If we call it “triangular with angles rounded off,” the base of the triangle is behind and the apex in front. It would be nearly oval were not the oval form broken by the promontory of the sacrum. This brim is the first solid resistance the head of the fœtus meets in its descent through the pelvis.