Final answer:
The internal oblique is a muscle located in the antero-lateral wall of the abdomen. Its primary function is to assist in trunk movements and protect the internal abdominal organs.
Step-by-step explanation:
The internal oblique is a muscle located in the antero-lateral wall of the abdomen. It is one of four pairs of abdominal muscles that cover the anterior and lateral abdominal region. The primary function of the internal oblique is to assist in various movements and rotations of the trunk, as well as to protect the internal abdominal organs.