GROSS ANATOMY

Detailed explanation-1: -Unilaterally, they laterally flex the trunk and rotate it to the same side. Like the internal obliques, the external obliques function bilaterally to flex the trunk and compress its contents. However, they function unilaterally to laterally flex the trunk and rotate the trunk to the opposite side.

Detailed explanation-2: -Action. Along with other abdominal wall muscles, the external oblique muscle flexes the trunk, assists expiration by depressing the ribs, and assists to maintain intra-abdominal pressure in evacuation of luminal contents and supports intra-abdominal viscera.

Detailed explanation-3: -External oblique is an opposite side rotation muscle, while internal oblique is a same side rotation muscle. They work together. Right external oblique and left internal oblique rotate the spine LEFT. Left external oblique and right internal oblique rotate the spine RIGHT.

Detailed explanation-4: -The external oblique muscles allow the trunk to twist, but to the opposite side of whichever external oblique is contracting. For example, the right external oblique contracts to turn the body to the left. internal oblique muscles – these flank the rectus abdominis and are located just inside the hipbones.