This tendon ascends to fuse with the inferior surface of the fibrous pericardium. ![]() The muscle fibres of the diaphragm combine to form a central tendon. Left crus – Arises from L1-L2 and their intervertebral discs.Right crus – Arises from L1-元 and their intervertebral discs. Some fibres from the right crus surround the oesophageal opening, acting as a physiological sphincter to prevent reflux of gastric contents into the oesophagus.The parts of the diaphragm that arise from the vertebrae are tendinous in structure, and are known as the right and left crura: Costal cartilages of ribs 7-10 (attach directly to ribs 11-12).Lumbar vertebrae and arcuate ligaments.The attachments of diaphragm can be divided into peripheral and central attachments. It acts as the floor of the thoracic cavity and the roof of the abdominal cavity. The diaphragm is located at the inferior-most aspect of the ribcage, filling the inferior thoracic aperture.
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