Which muscle “extends leg”?

ID: Which muscle is indicated by “A” in the image below.

Posterior portion of muscle extends arm, while lateral portion abducts arm:

A                                is a smaller muscle in a group that assists the agonist.

ID: Which letter indicates the levator scapulae in the image below?

ID: Which muscle is indicated by “C” in the image below?

The                                  is the larger muscle in a group and is also called the prime mover.

Muscle that increases thoracic diameter by elevating ribs during inspiration:

ID: Which letter indicates the supraspinatus in the image below?

Which muscle “flexes forearm”?