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Diaphragm

Other Terms: Thoracic diaphragm, Diaphragma, Diaphragme

Muscle parts

Lumbar part - right crus; Lumbar part - left crus; Costal part; Sternal part

Latin name

Diaphragma

Latin muscle parts

Pars lumbalis diaphragmatis - crus dextrum; Pars lumbalis diaphragmatis - crus sinsitrum; Pars costalis diaphragmatis; Pars sternalis diaphragmatis

Group

Thoracic wall – lateral musculature – internal layer

Etymology

In English, this muscle’s name is the muscle that encloses across. The word diaphragm comes from the Greek prefix dia meaning “across, or through” and the Greek phragmos meaning “a hedge or fence,” which is related to the verb phrassein meaning “to enclose.”

Origin

Inner surface of the xiphoid process, costal cartilages, ribs, and lumbar vertebrae

Insertion

Central tendon of the diaphragm

Action

Increases the volume of the thoracic cavity in inspiration.

Nerve supply

Phrenic nerve (C3, C4, and C5)

Blood supply

Superior phrenic artery, inferior phrenic artery, musculophrenic artery, pericardiacophrenic artery

Latin

Diaphragma

French

Diaphragme

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