Everything about The Acetabulum totally explained
The
acetabulum is a surface of the
pelvis. The
head of the femur meets with the pelvis at the acetabulum, forming the
hip joint.
Structure
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.
In
reptiles and in
birds, the acetabula are deep sockets.
Etymology
The word acetabulum means "little vinegar cup", and was the
Latin word for a small vessel for storing
vinegar (see
acetabulum). The word was later also used as a unit of volume, equal to roughly
270 ml.
Additional images
Image:Gray235.png|Right hip bone. External surface.
Image:Gray237.png|Plan of ossification of the hip bone.
Image:Gray321.png|Symphysis pubis exposed by a coronal section.
Image:Gray341.png|Left hip-joint, opened by removing the floor of the acetabulum from within the pelvis.
Image:Gray342.png|Hip-joint, front view.
Image:Gray343.png|Capsule of hip-joint (distended). Posterior aspect.
Image:Gray344.png|Structures surrounding right hip-joint.
Further Information
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