Femur

Generality

The femur is the bone that resides on the inside of the thigh, ie the top of each lower limb.

Belonging to the category of long bones, it has three main portions: the proximal end, which articulates with the pelvis; the central body, which has the shape of an hourglass; finally, the distal end, which articulates with the tibia for form the knee joint.
Each portion has a particular anatomy and has some specific areas, which act both as a point of origin and as a point of insertion for muscles and ligaments.
The femur is essential for the distribution of body weight along the entire lower limb and for locomotion.

So is the femur

The femur is the only bone in the thigh. It belongs to the category of long bones and represents the longest bone element in the human body.
The femur is an even bone and acts both as a point of origin and as a zone of insertion for numerous muscles and ligaments.