Muscle Attachments of the Anterior Abdominal Wall

Origin and Insertion of External Oblique

The external oblique muscle is a key component of the anterior abdominal wall, playing a vital role in core stability and movement. It originates from the lower ribs and inserts into multiple anatomical structures.

Origin

• Arises from the external surfaces of ribs 5-12.
• Fibers run obliquely downward and medially.

Insertion

• Inserts into the linea alba, pubic tubercle, and anterior half of the iliac crest.
• Forms the inguinal ligament as part of its lower fibers.

Function

The external oblique contributes to several movements, including trunk flexion, lateral flexion, and rotation. It also provides structural support to abdominal organs.

Clinical Relevance

Dysfunction or weakness of the external oblique muscle can lead to core instability and contribute to conditions such as lower back pain and hernias.