|Ligament: Ligament of head of femur|
|Left hip-joint, opened by removing the floor of the acetabulum from within the pelvis. (Ligamentum teres visible at center.)|
|Hip-joint, front view. The capsular ligament has been largely removed. (Ligam. teres visible at center.)|
|Latin||ligamentum capitis femoris, ligamentum teres femoris|
|Gray's||subject #92 336|
In human anatomy, the ligament of the head of the femur (Latin: ligamentum capitis femoris'), or the round ligament of the femur (Latin: ligamentum teres femoris'), commonly referred to as the ligamentum teres, is a triangular, somewhat flattened band implanted by its apex into the antero-superior part of the fovea capitis femoris; its base is attached by two bands, one into either side of the acetabular notch, and between these bony attachments it blends with the transverse ligament.
Research suggests it contributes little influence as a ligament past childhood, although it may still be important in transmitting arterial supply to the head. The ligament gives the femur a stabilizing strength which, as in the orangutan, some animals lack.
The ligament of the head of the femur contains within it the acetabular branch of medial circumflex femoral artery.
In the orangutan, an Asian arboreal brachiator who uses all four limbs to move about, the head of the femur is completely spherical and the head-acetabulum ligament is absent, which allows for a greater range of motion. In African apes, such as bonobos, chimpanzees, and gorillas who move mainly by terrestrial knuckle-walking, this ligament is present.
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