Thorax

                 Diaphragmatic openings

A) Major openings  :-

• Vena caval opening (T8) (Quadrilateral) - Located In Central Tendon of Diaphragm - IVC , Right phrenic nerve , Lymphatics of liver pass through this opening - (on Contraction of diaphragm Venacaval opening undergoes Dilation)

• Esophageal opening (T10) (Elliptical) - Located In Muscular Part  of Diaphragm - Esophagus , Vagus nerve (Right & Left) , Left Gastric vessels pass through this opening - (on Contraction of diaphragm Esophageal opening undergoes Constriction)

• Aortic opening(T12) (Rounded) - Located In Crus of Diaphragm - Aorta , Thoracic duct , Azygous vein , Hemiazygous vein pass through this opening - (on Contraction of diaphragm Aortic opening undergoes No change)

Note - 

• Splanchnic nerves pass through Right and Left Crus of Diaphragm

• Azygous vein may sometimes pass through Right Crus of Diaphragm

• Hemiazygous vein may sometimes pass through Left Crus of Diaphragm

B) Minor openings :-

• Space of Larry (Superior Epigastric Artery passes in Space of Larry between Slip of Xiphoid process & 7th Costal cartilaginous slip of diaphragm i.e.., COSTOXIPHOID GAP)

• Musculophrenic Artery Perforates diaphragm at level of 9th Coastal cartilage

• Medial arcuate ligament - Sympathetic Trunk

• Lateral arcuate ligament - Subcoastal nerves & vessels

• Left Phrenic nerve - Left Cupola

• Lower 5 intercoastal vessels & nerves pass between Coastal origins of diaphragm & Transversus abdominis

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