Anatomic.us > Respiratory System

Diaphragm

The diaphragm is a sheet of internal skeletal muscle that extends across the bottom of the rib cage. It is dome-shaped and separates the chest from the abdomen. It sometimes is referred to as the thoracic diaphragm. This is because it is located in the thoracic (chest) cavity. It is attached to the sternum, ribs, and spine and is the main muscle of respiration. The lungs are protected by the rib cage so during the breathing process, the diaphragm is drawn downward until it is flat. At the same time the muscles around the ribs pull them up which allows the lungs which are in the chest cavity to have more room to expand with air.

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Diaphragm

The two parts of the diaphragm  are the peripheral muscular and the central aponeurotic parts. There are three peripheral diaphragm parts.

 

Peripheral Diaphragm Parts:

  • Sternal (referring to the sternum)

  • Costal (referring to the ribs)

  • Lumbar (referring to the spinal column)

Muscle fibers from the peripheral muscular part converge on the central aponeurotic part, which is a thick plate of dense fibers. The sternal part is made up of two small muscular slips and attach to the back of the xiphoid process. The costal part is made up of wide muscular slips and come from the inferior six ribs internal surfaces and costal cartilages. They interdigitate with the slips of the transversus abdominis muscles. The lumbar part comes from the lumbar vertebrae by two pillars called the musculo tenstetoriu crura. These pillars attach on both sides of the aorta. There are openings in the diaphragm for the esophagus, the phrenic nerve (which is what controls the movements of the diaphragm producing the breathing), and the aorta and vena cava blood vessels, which lead to and from the heart.


The two parts of the diaphragm  are the peripheral muscular and the central aponeurotic parts. There are three peripheral diaphragm parts.

 

Peripheral Diaphragm Parts:

  • Sternal (referring to the sternum)

  • Costal (referring to the ribs)

  • Lumbar (referring to the spinal column)

Muscle fibers from the peripheral muscular part converge on the central aponeurotic part, which is a thick plate of dense fibers. The sternal part is made up of two small muscular slips and attach to the back of the xiphoid process. The costal part is made up of wide muscular slips and come from the inferior six ribs internal surfaces and costal cartilages. They interdigitate with the slips of the transversus abdominis muscles. The lumbar part comes from the lumbar vertebrae by two pillars called the musculo tenstetoriu crura. These pillars attach on both sides of the aorta. There are openings in the diaphragm for the esophagus, the phrenic nerve (which is what controls the movements of the diaphragm producing the breathing), and the aorta and vena cava blood vessels, which lead to and from the heart.

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