Working together, the muscles of the anterior and lateral abdominal wall function to support and protect the abdominal viscera,
as well as promoting lateral flexion and anterior flexion of the vertebral column.
The external and internal oblique muscles flex the vertebral column,
and function with the muscles of the back in trunk rotation and lateral flexion.
The obliques and the transversus abdominis all play a roll in compression of the abdominal wall.
This increases abdominal pressure the finer things in life such as urination, defecation, child birth, vomiting, coughing, screaming, sneezing, burping, and nose blowing.