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Muscle Type
Feature Two regions, crural diaphragm and costal diaphragm. Also left and right hemidiaphragms.
Origin Sternal (arising from two strips under the xiphoid process), costal (arising from inner surfaces of lower six costal cartilages and adjoining ribs, interdigitating with the transversus abdominis muscle), lumbar (arising from the aponeurotic arches and lumbar vertebrae.
Insertion Common insertion point of the central tendon
Action Respiratory, straining, gastro-oesophageal sphincter control.
Spinal innervation C3-5
Peripheral Innervation Phrenic Nerve, separate branches innervate the crural and costal regions.