Final answer:
The inguinal canal's anterior wall is formed by the external oblique muscle. It is part of the complex structure of the anterior abdominal wall that includes other muscles such as the rectus abdominis.
Step-by-step explanation:
The anterior wall of the inguinal canal is primarily formed by the external oblique muscle of the anterior abdominal wall.
The inguinal canal is an important passageway in the abdominal wall that allows structures such as the ductus deferens in males and the round ligament in females to transit from the abdominal cavity to the external genitalia.
The structures of the anterior abdominal wall, including the rectus abdominis, external oblique, internal oblique, and transversus abdominis muscles, together provide protection and support for abdominal organs.