abdominal internal oblique muscle(redirected from Obliquus internus abdominis muscle)
in·ter·nal ob·lique (mus·cle)[TA]
flat muscle of anterolateral abdominal wall; origin, iliac fascia deep to lateral part of inguinal ligament, anterior half of crest of ilium, and lumbar fascia; insertion, tenth to twelfth ribs, with aponeurosis contributing to the sheath of rectus; some of the fibers from inguinal ligament terminate in the conjoint tendon; action, diminishes capacity of abdomen, flexes lumbar vertebral column (bends thorax forward); nerve supply, lower thoracic.
abdominal internal oblique muscle
A muscle with origin from the iliac fascia deep to the lateral part of the inguinal ligament, to the anterior half of the crest of the ilium, and to the lumbar fascia, with insertion into the tenth to twelfth ribs and the sheath of the rectus muscle of the abdomen, with nerve supply from the lower thoracic nerve, and whose action diminishes the capacity of the abdomen and bends the chest forward.