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Description
The diaphragm is a thin musculotendinous structure that fills the inferior thoracic aperture and separates the thoracic cavity from the abdominal cavity.
Peripheral attachments
Xiphoid process of sternum; Costal margin of the thoracic wall; Ends of ribs 11 and 12; Ligaments that span across structures of the posterior abdominal wall; Vertebrae of the lumbar region.
Central attachments
From its peripheral attachments, muscle fibers converge to form a central tendon; The pericardium is attached to the middle part of the central tendon.
Posterior attachments
Median arcuate ligament.
Nerve supply
Phrenic nerves (C3, C4, C5).
Action
Increases the volume of the thorax.
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