External obliquus abdominis muscle

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External obliquus abdominis muscle
5th to 12th rib
Linea alba , lig. Inguinale , crista iliaca, tuberculum pubicum
Flexion and rotation of the trunk, expiration
Intercostal nerves (Th5-11), subcostal nerve

The musculus obliquus externus abdominis ( Latin for "external oblique abdominal muscle") arises alternately with the spikes of the musculus serratus anterior and the musculus latissimus dorsi from the fifth to twelfth rib . It pulls with its abdominal tendon ( crus mediale ) to the linea alba and with its pelvic tendon ( crus laterale ) to the iliac bone .

The outer inguinal ring lies between its two terminal tendons .


On one side, the external oblique abdominal muscle tilts the trunk to the same side and turns it to the opposite side. If the muscles on both sides work together, they are responsible for flexing the trunk and lifting the pelvis , and also for exhalation and abdominal pressure .


The muscle can have more or less jagged edges. In addition, there may be adhesions with the serratus anterior muscle and the latissimus dorsi muscle . Occasionally, the obliquus is also divided by the intermediate tendons. None of these varieties affect the function of the muscle.