Diaphysis

The shaft, or central portion, of a long bone, such as the femur. 

 Diaphysis 

The epiphysis (end of the long bone) develops independently from the diaphysis, as they are initially separated by a mass of cartilage known as the epiphyseal plate. The diaphysis and epiphysis eventually fuse to form a complete bone.

More details:  📖 Weir & Abrahams’ Imaging Atlas of Human Anatomy 6th Edition

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