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There are two muscles that move the arm away from the body (abduction), the supraspinatus and the deltoid.
deltoid
foot muscles
Coracobrachialis Muscle
The action of the calcaneal tendon is to allow your soleus and gastrocnemius muscles to (plantar) flex your foot.
In my research. Abduction, in functional anatomy, is a movement which draws a limb away from the median (Sagittal) plane of the body. It is thus opposed to adduction.
In the canine: the gluteal muscles (superficial, middle, deep).
Muscles allow the skeleton to move.
Flexion, abduction, and lateral rotation at the hip, and flexion and medial rotation at the knee.
The major muscle that abducts the humerus is the Deltoid. (all muscles move in conjuction, there may be more muscles that contribute to the abduction of the humerus) pectoralis major and latissimus dorsi
The muscles which allow you to extend your wrist and flare your fingers are the flexor muscles in the wrist and the prime movers in the fingers. These muscles will coordinate to adduct the wrist and the fingers.
voluntary, you control what it does.