The abdominal muscles are divided into superficial and deep abdominal muscles. The superficial abdominal muscles are anteriorly located and external to the abdominal cavity of the trunk wall. The deep abdominal muscles is located in front of the spine.
The superficial abdominal muscles (also called "abdominal wall musculature") is divided into a lateral group and a front group of muscles.
Note: The iliopsoas muscle is not considered by all authors to be an abdominal muscle.
The wide lateral abdominal muscles merge into extensive aponeuroses in the median plane direction and intertwine thereafter in the median plane. This creates the linea alba, a stretch of connective tissue reaching from the xiphoid process (xiphoid) of the sternum up to pubic symphysis.
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