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Sesamoid bones can be found on joints throughout the human body, including: In the knee—the patella (within the quadriceps tendon). This is the largest sesamoid bone. [4] In the hand—two sesamoid bones are commonly found in the distal portions of the first metacarpal bone (within the tendons of adductor pollicis and flexor pollicis brevis).
The fabella is a small sesamoid bone found in some mammals embedded in the tendon of the lateral head of the gastrocnemius muscle behind the lateral condyle of the femur. It is an accessory bone, an anatomical variation present in 39% of humans. [1] [2] Rarely, there are two or three
Sesamoid of the second metatarsal: 0.4% Sesamoid of the third metatarsal: 0.2% Sesamoid of the fourth metatarsal: 0.1% Sesamoids of the fifth metatarsal: 4.3% Sesamoid of the interphalangeal (IP) joint of the great toe: 2–13% Ossicles Os trigonum (not visible in this dorsoplantar projection) 7–25% Os peroneum: Up to 26% Accessory navicular ...
A sesamoid bone is a small, round bone that, as the name suggests, is shaped like a sesame seed. These bones form in tendons (the sheaths of tissue that connect bones to muscles) where a great deal of pressure is generated in a joint. The sesamoid bones protect tendons by helping them overcome compressive forces.
In both of these locations, the tendon is thickened. At the cuboid, a fibrocartilaginous sesamoid (sometimes a sesamoid bone) usually develops in the substance of the tendon. [2] The fibularis longus muscle is supplied by the superficial fibular nerve, which arises from the fifth lumbar and first sacral roots of the spinal cord. [3]
The front and back surfaces are joined by a thin margin and towards centre by a thicker margin. [1] The tendon of the quadriceps femoris muscle attaches to the base of the patella., [1] with the vastus intermedius muscle attaching to the base itself, and the vastus lateralis and vastus medialis are attached to outer lateral and medial borders ...
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Another variant, the cyamella, is a small sesamoid bone embedded in the tendon of the popliteus muscle. It is rarely seen in humans, with prevalence rates from 0.57–1.8%, [ 4 ] but has been described more often in other primates and certain other animals.