Bone Sesamoid

The sesamoid bone, also known as ossa sesamoidea, pna, bna or jna, is a unique structure in human anatomy. These bones are small, flat and oval structures that sit within tendons and serve as attachment points for muscles.

The name "sesamoid" comes from the resemblance of these bones to sesame seeds (sesame seeds are called sesam). They get their name because of their shape and placement in a tendon that resembles a seed inside a fruit.

Sesamoid bones are usually found near joints and serve to reduce friction and improve the mechanical efficiency of muscles. They also help increase the torque produced by the muscles and provide stability and support during movement.

The most famous sesamoid bone in the human body is the patella or kneecap. The patella is the largest and strongest sesamoid bone and is located in the front of the knee joint. It serves as the attachment point for the quadriceps muscle and helps transmit force from the muscle to the tendon and on to the bones.

Besides the patella, sesamoid bones can also be found in other parts of the body such as the wrist, foot and spine. In each of these locations they perform similar functions - improving mechanical efficiency, reducing friction and providing stability.

Although the sesamoid bones are relatively small, they play an important role in maintaining optimal muscle and joint function. Their presence and proper functioning are important for normal movement and injury prevention.

In conclusion, the sesamoid bone is a small, flat and oval bone located in tendons. They serve as attachment points for muscles and improve mechanical efficiency, reduce friction, and provide stability. The patella is the best known sesamoid bone and is located in the front of the knee joint. Proper function of the sesamoid bones is important to maintain normal movement and prevent injury.