PELVIC GIRDLE (cingulum membri inferioris; synonym belt of the lower extremity) — the part of a skeleton serving at vertebrate animals and at the person for connection of a free lower (back) extremity with a trunk. Etc. consists of three bones: ileal (os ilium), sciatic (os ischii) and pubic (os pubis), to-rye, growing together, form a uniform haunch bone (os coxae). By means of the right and left sacroiliac joints (see) bones Other are strongly connected to the sacrum making caudal department of a rachis (see. Backbone ), and by means of pubic symphysis (see) — among themselves, forming a uniform bone ring — basin (see). Free lower extremities (see) connect with Other by means of the right and left hip joints (see), each of to-rykh is formed by an acetabular hollow of a haunch bone and a head of a femur.
Anatomic features Other at the person are connected with bipedalism. During the standing and movement in space (locomotion) the body of the person leans on the lower extremities. Therefore important functional value as a support for a trunk Etc. has. Weight of a body is transferred on a rachis to a sacrum, and from a sacrum — in two directions; to a pubic symphysis and to sedalishchnykhm to hillocks of haunch bones. Thus, in the biomechanical relation Other represents as if two bone arches, on the Crimea the gravity of a body is distributed. One of these arches is formed by a sacrum, ileal and pubic bones, and another — a sacrum, ischiums and the lower branches of pubic bones. Connections of bones of a pelvic girdle are characterized by small mobility and big durability of the copular device.
Bibliography: Ivanitsky M. F. Movements of a human body. M, 1938; Shmalgauzen I. I. Bases of a comparative anatomy of vertebrate animals, M., 1947.
V. I. Kozlov.