Initially it shows the development of arcs of bone known as trabeculae, which later disappear.  
Although it almost forms a perfect cylinder, it is not perfectly vertical; rather, each member of the pair inclines downward and inward towards the other.  Near its head can be found the acetabulum and two large prominences, known as condyles, are on either side of its lower end.  Initially it shows the development of arcs of bone known as trabeculae, which later disappear.  At the upper extremity are two trochanters [tro-KAN-ters], while the lower extremity contains a depression known as the patellar surface.  FTP, name this bone that connects the pelvis to the kneecap, the longest and strongest bone in the human body.
Although it almost forms a perfect cylinder, it is not perfectly vertical; rather, each member of the pair inclines downward and inward towards the other.  
femur