acetabular part of hip bone 髋关节髋臼部分 AAO:0000770 Cavity for the articulation of the proximal bone of the hind limb.[AAO] During the transformation from the osteolepiform fins to tetrapod limbs, the appendages and girdles underwent a number of radical changes. The pelvic girdle became a weight-bearing structure by evolution of an ischium, a full mesio-ventral contact between the two sides of the girdle, an ilium, and a contact between the vertebral column and the girdle through a sacral rib. Fore- and hindlimbs shifted laterally by reorientation of the glenoid and the acetabulum.[well established][VHOG] EHDAA:10661 EMAPA:18346 FMA:16579 GAID:206 In reptiles and in birds, the acetabula are deep sockets. MA:0001335 MESH:A02.835.232.611.108 OpenCyc:Mx4rwJlP9ZwpEbGdrcN5Y29ycA RETIRED_EHDAA2:0001427 The acetabulum is a concave surface of the pelvis. The head of the femur meets with the pelvis at the acetabulum, forming the hip joint. There are three bones of the os coxae (hip bone) that come together to form the acetabulum. Contributing a little more than two-fifths of the structure is the ischium, which provides lower and side boundaries to the acetabulum. The ilium forms the upper boundary, providing a little less than two-fifths of the structure of the acetabulum. The rest is formed by the pubis, near the midline. It is bounded by a prominent uneven rim, which is thick and strong above, and serves for the attachment of the acetabular labrum, which reduces its opening, and deepens the surface for formation of the hip joint. At the lower part of the acetabulum is the acetabular notch, which is continuous with a circular depression, the acetabular fossa, at the bottom of the cavity of the acetabulum. The rest of the acetabulum is formed by a curved, crescent-moon shaped surface, the lunate surface, where the joint is made with the head of the femur. Its counterpart in the pectoral girdle is the glenoid fossa.[WP,unvetted]. UBERON:0001269 UMLS:C0000962 VHOG:0000974 acetabular region acetabulum uberon whilst WP defines this as a surface, MA treats it as a bone. There are other FMA classes that may be better suited to representing the surface. 关节窝 同时WP将其定义为一个表面，MA则将其视为骨头。还有其他的FMA类可能更适合于表示曲面。 在从骨形鱼鳍到四足肢的转变过程中，附肢和肢带骨经历了一些剧烈的变化。骨盆带通过坐骨的演变、腰、髂两侧之间的完全中腹接触以及脊柱与腰之间通过骶骨肋的接触而形成承重结构。前肢和后肢因关节盂和髋臼的重新定向而侧向移位。[well established][VHOG] 在爬行动物和鸟类中，髋臼是深窝。 用于后肢近端骨的关节运动的空腔。[AAO] 髋臼是骨盆的一个凹面。股骨头与骨盆在髋臼相遇，形成髋关节。有三根髋关节骨（髋骨）合在一起形成髋臼。在这个结构中，有超过五分之二的结构是坐骨，它为髋臼提供了较低的和侧的边界。髂骨形成上部边界，提供稍小于髋臼五分之二的结构。其余由中线附近的耻骨形成。它有一个突出的不平坦的边缘，这个边缘厚而有力的，用于髋臼唇的附着，缩小了它的开口，并加深髋关节的形成表面。在髋臼的下部是髋臼凹口，在髋臼腔的底部是连续的，有一个圆形凹陷，即髋臼窝。髋臼的其余部分由弯曲的月牙形表面形成，在月骨表面，这个关节是有股骨头组成的。它在胸带的对应部分是关节窝。[WP，unvetted]。 髋臼部位 mesoderm-derived structure 中胚层衍生结构 zone of bone organ 骨器官区