A large sesamoid bone intercalated in the tendon of the quadriceps femoris muscle; free surface is strongly convex, rough and irregular. Articular surface is convex from side to side and nearly straight vertically.
In trochlea of distal end of femur
Two, one in each hind limb
Appears In Crossection
Round H-I, K
In front of joint between the femur and tibia