External oblique muscle

External oblique muscle is one of the outermost muscles, lying on the lateral and anterior parts of the abdomen. It is broad, thin, and irregularly quadrilateral, its muscular portion occupying the side, its aponeurosis the anterior wall of the abdomen.

Structure

The external oblique muscle is situated on the lateral and anterior parts of the abdomen. It is broad, thin, and irregularly quadrilateral, its muscular portion occupying the side, its aponeurosis the anterior wall of the abdomen.

Origin

The external oblique muscle originates from the outer surface of the lower eight ribs by eight fleshy digitations, which are arranged in an oblique line that courses inferiorly and laterally.

Insertion

The muscle inserts at the linea alba, pubic tubercle, and the anterior half of the iliac crest.

Function

The external oblique muscle functions to pull the chest downwards and compress the abdominal cavity, which increases the intra-abdominal pressure. It also performs contralateral rotation of the trunk.

Clinical significance

Injury or strain to the external oblique muscle can result in pain and difficulty in performing activities involving the torso. Treatment usually involves rest, physical therapy, and in severe cases, surgery.

See also

• Abdominal external oblique muscle
• Internal oblique muscle
• Transversus abdominis muscle

References

External oblique muscle Resources
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