Explain why anatomists describe the adductor magnus as a muscle composed of two parts: an adductor part and a hamstring part.

Anatomists describe the adductor Magnus as a muscle composed of two parts because they consider origin, insertion, and function.

Explanation:

This happens because anatomists classify muscles by their origin and insertion, which influence muscle function.

The origin is usually the proximal end of a muscle that remains fixed during contraction. However, the insertion is the distal end of the muscle that moves during contraction.

In this case, the adductor part originates in an inferior branch of pubis and inserts in linea aspera of femur, having a function to perform the adduction.

On the other hand, the hamstring part originates from sciatic tuberosity and is inserted in the medial supracondylar / adductor tubercle, having the flexion function.

The answer is D. in an area uncovered by a retreating glacier (Apex)