Sesamoid bones are small, round bones embedded within tendons.
Location: Found in areas where tendons pass over joints.
Unlike long bones, sesamoid bones lack a medullary cavity and haversian system.
|
Sesamoid Bone |
Associated Tendon |
Location |
|
Patella cubiti |
Triceps brachii |
Near elbow joint |
|
Pisiform |
flexor carpi ulnaris |
Wrist joint |
|
Fabella |
Lateral head of the gastrocnemius muscle |
Posterior to the knee joint |
|
First metatarsal sesamoids (two sesamoid bones) |
Flexor hallucis brevis |
Under the first metatarsophalangeal (MTP) joint of the big toe |
Figure- Sesamoid bone (Flexor hallucis brevis; FHB)