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Obliquus externus abdominis
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118
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409
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The Obliquus Externus abdominis
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Femoral sheath laid open to show its three compartments
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Lower 8 costae
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Crista Iliaca, ligamentum inguinale
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Rotates torso
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Fallus Nerve
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The (External or descending oblique muscle), situated on the lateral and anterior parts of the
Abdomen , is the largest and the most superficial of the three flat muscles in this region.
It is broad, thin, and irregularly quadrilateral, its muscular portion occupying the side, its
Aponeurosis the anterior wall of the abdomen.
It arises, by eight fleshy digitations, from the external surfaces and inferior borders of the lower eight ribs; these digitations are arranged in an oblique line which runs downward and backward, the upper ones being attached close to the cartilages of the corresponding ribs, the lowest to the apex of the cartilage of the last rib, the intermediate ones to the ribs at some distance from their cartilages.
The five superior serrations increase in size from above downward, and are received between corresponding processes of the
Serratus Anterior ; the three lower ones diminish in size from above downward and receive between them corresponding processes from the
Latissimus Dorsi . From these attachments the fleshy fibers proceed in various directions.
Those from the lowest ribs pass nearly vertically downward, and are inserted into the anterior half of the outer lip of the iliac crest; the middle and upper fibers, directed downward and forward, end in an aponeurosis, opposite a line drawn from the prominence of the ninth
Costal Cartilage to the anterior superior iliac spine.
