Anatomy
The diaphragm is a dome-shaped musculofibrous septum that separates the thoracic from the abdominal cavity, its convex upper surface forming the floor of the former, and its concave under surface forming the roof of the latter. Its peripheral part consists of muscular fibers that take origin from the circumference of the inferior thoracic aperture and converge to be inserted into a central tendon.
The muscular fibers may be grouped according to their origins into three parts:
| Part | Origin |
| sternal | two muscular slips from the back of the xiphoid process. |
| costal | the inner surfaces of the cartilages and adjacent portions of the lower six ribs on either side, interdigitating with the Transversus abdominis. |
| lumbar | aponeurotic arches, named the lumbocostal arches, and from the lumbar vertebrae by two pillars or crura. |
There are two lumbocostal arches, a medial and a lateral, on either side.
Read more about this topic: Thoracic Diaphragm
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