Axis of upper limb passes through
High-Yield Explanation
Mechanical axis It is defined as the straight line connecting the joint center points of the proximal and distal joints. The mechanical axis is always a straight line, whether in the frontal or sagittal plane. Anatomic axis The anatomic axis of a bone is the mid-diaphyseal line. The anatomic axis line may be straight in the frontal plane but curved in the sagittal plane, as in the femur. ref : maheswari 9th ed