The anterior or posterior fibers tighten, while the opposing side stretches and flattens out. The Upper Arm (Biceps and Triceps) These antagonist muscle groups control the elbow joint.
[Supination: Parallel Bones] ---> Forearm muscles retain wide, flat lateral profiles. [Pronation: Crossed Bones] ---> Muscles twist diagonally; the brachioradialis shifts inward. The Shoulder and Upper Arm
: A tapering form that changes drastically from a flattened oval to a teardrop shape during rotation.
The arm does not move independently; it is mechanically linked to the shoulder girdle.When the arm raises, the clavicle and scapula must move with it. Rhythms of the Upper Body
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Even in motion, these bony points remain palpable and should define your primary masses.