"The internal oblique muscle has a free lower border, in comparison to the external oblique muscle that has a free posterior border which forms the anterior boundary of the lumbar triangle of Petit. The free lower border of the internal oblique muscle is located anterior to the deep inguinal ring. It arches over the spermatic cord – laterally there are muscle fibres anterior to the cord, and medially there are tendinous fibres behind the cord 1. Inferiorly, it attaches onto the pectineal line with the transversus aponeurosis, which forms the conjoint tendon."
"innervation: lower intercostal nerves (T7-T12), ilioinguinal and iliohypogastric nerves"
"action: compression of abdominal content, forced expiration, flexes and bends the trunk"
"innervation: lower intercostal nerves (T7-T12), ilioinguinal and iliohypogastric nerves"
"lower intercostal nerves (T7-T12)"
Expected headings
"Function"
"action: compression of abdominal content, forced expiration, flexes and bends the trunk"
"Along with other abdominal wall muscles, the internal oblique muscle flexes and bends the trunk, assists forced expiration by depressing the lower ribs, and helps to maintain intra-abdominal pressure in defaecation, micturition and childbirth."