Accessory Bones and Sesamoid Bones

What are sesamoid bones and which accessory bones are considered as sesamoid bones? Sesamoid bones are small, round bones that form in tendons where a great deal of pressure is generated in a joint. They protect tendons by helping them overcome compressive forces. The only sesamoid bones found in common with every person are the patellae. Two of the accessory bones mentioned, Os peroneum and Os trigonum, are also considered as sesamoid bones.

Sesamoid Bones: Small Bones in Tendons

Sesamoid bones are small, round bones that develop within tendons near joints. They act as pulleys to provide a smooth surface for tendons to slide over, thus increasing the mechanical efficiency of muscles.

Accessory Bones as Sesamoid Bones

Accessory bones that are considered as sesamoid bones include Os peroneum and Os trigonum. These bones develop in tendons where there is significant pressure and help in protecting the tendons from compressive forces.

In addition to these accessory bones, there are other common sesamoid bones in the human body. The patellae, also known as the kneecaps, are the largest sesamoid bones and are present in every individual.

It is important to note that not all accessory bones are sesamoid bones. While some accessory bones like Os peroneum and Os trigonum function as sesamoid bones, others serve different purposes in the skeletal system.

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