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| back to articles PDF Copy of Article Muscles of the Abdomen Muscles of the anterior abdominal wall include 3 layers (external and internal obliques and the transversus abdominis) and a vertically oriented group called the rectus abdominis, which are enclosed in a connective tissue sheath. These muscles are important in respiration, increasing intra-abdominal pressure (for defecation, urination, or childbirth), and flexing and bending the trunk.  Anterior abdominal wall: intermediate dissection |
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