Final answer:
The external oblique is a superficial abdominal muscle with fibers extending inferiorly and medially, essential for trunk movement and rotation, core stability, and protecting abdominal organs.
Step-by-step explanation:
The external oblique muscle is one of the three flat skeletal muscles located on the antero-lateral wall of the abdomen. This muscle is the most superficial of the three, lying closest to the skin, and its fibers run in a direction comparable to the way one would slide their fingers into pants pockets - inferiorly and medially.
The primary functions of the external oblique include aiding in the movement and rotation of the trunk, stabilization of the core, and protection of the internal abdominal organs in areas lacking bony structures.