Author: Niamh Gorman MSc•Reviewer: Nicola McLaren MScLast reviewed: October 09, 2021Reading time: 9 minutes




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The diaphragm is an unpaired, dome shame skeletal muscle that is located in the trunk. That separates the thoracic and ab cavities from each other by closeup of the door the inferior thoracic aperture.

The diaphragm is the major muscle the is energetic in inspiration. Contraction of the muscle facilitates growth of the thoracic cavity. This increases volume of the the cavity, which in turn decreases the intrathoracic pressure allowing the lungs to expand and also inspiration to occur.

The diaphragm is much an ext than just a sheath separating your thoracic and abdominal cavities. This post will study this elaborate and an important muscle in detail, looking at its anatomy, function and frameworks which pass with it.

an essential facts around the diaphragm
origin Sternal part: Posterior aspect of xiphoid procedure Costal part: internal surfaces of lower costal cartilages and ribs 7-12 Lumbar part: Medial and lateral arcuate ligaments (lumbocostal arches), body of vertebrae L1-L3 (+intervertebral discs), anterior longitudinal ligament
Insertion central tendon that diaphragm
connections Pleural cavities, pericardial sac, liver, right kidney, ideal suprarenal gland, stomach, spleen, left kidney, left suprarenal gland
Openings Aortic hiatus (aorta, azygos vein, thoracic duct), esophageal hiatus (esophagus, vagus nerve), caval foramen (inferior vena cava) Mnemonic: I 8 10 eggs AT 12Greater, lesser, least splanchnic nerves, premium epigastric vessels
Innervation Phrenic nerves (C3-C5) (sensory innervation the peripheries via 6th-11th intercostal nerves) Mnemonic:  C3, 4, 5 keeps the diaphragm alive!
Blood supply Subcostal and lowest 5 intercostal arteries, worse phrenic arteries, superior phrenic arteries
features Depresses costal cartilages, main muscle of breathing (inspiration)

Contents
Structure and also relationsInnervationClinical notes


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Origin and also insertion

The diaphragm is a musculotendinous structure with a peripheral attachments to a number of bony structures. The is attached anteriorly come the xiphoid procedure and costal margin, laterally to the 11th and 12th ribs, and posteriorly to the lumbar vertebrae. The posterior attachments to the vertebrae is through tendinous bands referred to as crura. The crura are attached come the anterior aspect of the body of the 1st, 2nd and 3rd lumbar vertebrae. The muscle fibres, prolonging from your bony attachments, converge top top a main tendon.