Muscular extension of the diaphragm that originates from
the anterolateral surface of the upper three lumbar
vertebrae
Left crus
Muscular extension of the diaphragm that originates from
the anterolateral surface of the upper two lumbar
vertebrae
,Apertures of the Diaphragm
Caval opening, esophageal hiatus, and aortic hiatus
Caval opening
Opening for the inferior vena cava in the central tendon at
the T8 level
,Esophageal hiatus
Opening for the esophagus at level T10
Aortic hiatus
Opening for the abdominal portion of the aorta between
the left and right crus, anterior to T12
, Intercostal muscles
Series of muscle layers between adjacent ribs, helping to
form the chest wall. Twisting and reaching upward my
result in strain or tear.
External intercostal muscles
Fibres run anteroinferiorly from the lower border of the
rib.