Anatomy & Physiology › Section J · The muscular system › Topic J.4
Muscles of the abdominal wall and thorax
Between the ribs and the pelvis there is no bone at the front of the body, only layered sheets of muscle. Those sheets, the diaphragm above them, the muscles between the ribs and the floor of the pelvis below, protect the organs, move the trunk and power every breath.
In this topic
- A wall without bone
- The rectus abdominis
- Three flat layers
- What the flat muscles do
- Worked example: twisting to the right
- The posterior abdominal wall
- The diaphragm
- The intercostal muscles
- Worked example: raising abdominal pressure
- The pelvic floor and perineum
- Common mistakes to avoid
- Key takeaways
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