Diaphragm Flashcards
(25 cards)
From which embryological layer is the diaphragm derived?
Innermost layer of thoracic wall muscles
Where do most diaphragmatic fibers arise from?
Costal margin
Which structures complete the posterior origin of the diaphragm?
Arcuate ligaments and crura
Which vertebrae does the right crus of the diaphragm overlap?
Upper 3 lumbar vertebrae and intervertebral discs
Which vertebrae does the left crus overlap?
Upper 2 lumbar vertebrae
Which structure forms the esophageal sling?
Right crus sloping to the left
What forms the median arcuate ligament?
Tendinous arches from the crura
What forms the medial arcuate ligament?
Thickening of the psoas fascia
What forms the lateral arcuate ligament?
Thickening of the lumbar fascia (quadratus lumborum fascia)
List the 5 sites of origin of diaphragmatic fibers.
Crura, medial and lateral arcuate ligaments, tip of rib 12, costal cartilages and adjoining ribs, xiphisternum
Which dome of the diaphragm is higher?
Right dome
Where do the diaphragmatic fibers descend into or insert?
Central tendon
At what vertebral level is the aortic opening?
T12
What is the position of the aortic opening?
Midline
What passes through the aortic opening?
Aorta, azygos vein, thoracic duct
At what vertebral level is the esophageal opening?
T10
What is the position of the esophageal opening?
Left
What passes through the esophageal opening?
Vagal trunk, branch of left gastric artery, esophagus
At what vertebral level is the vena caval opening?
T8
What is the position of the caval opening?
Right
What passes through the caval opening?
Inferior vena cava, right phrenic nerve
Which arteries supply the diaphragm?
Lower 5 intercostal, subcostal, right and left inferior phrenic arteries
Which surface of the diaphragm do the inferior phrenic arteries supply?
Abdominal surface
What is the main motor nerve supply of the diaphragm?
Phrenic nerves
