JAMES STEVENSON / SCIENCE PHOTO LIBRARY. JAMES STEVENSON / SCIENCE PHOTO LIBRARY.
Photograph of the right human femur (thigh bone), showing a posterior view of the proximal end of the long bone which supports the femoral trochanter (head of femur). The femur is the longest and strongest bone in the skeleton; length is necessitated by the manner of the human striding gait, with strength needed to withstand the muscular forces associated with such movement. The rounded head forms the ball section of the ball & socket hip joint, projecting from the cylindrical shaft on a short neck. The head is smooth, roughly hemispherical, with a small central recess (fovea - a ligament anchorage), and articulates with the acetabulum, the hip socket.
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