Exam 4 Flashcards
The ______ is the principle muscle of inspiration
diaphragm
The diaphragm is _____ shaped with its posterior attachment placed much more ______ its the anterior attachment
dome;
inferior
The diaphragm forms the ____ of the thoracic cavity and the ______ of the abdominal cavity
floor; roof
During respiration, when the diaphragm contracts, the vertical dimension of the thoracic cavity is _______. When the diaphragm ascends as it relaxes, the vertical diameter of the thoracic cavity ______
increased;
decreased
During abdominal straining, movement of the diaphragm is important in ____ _____
blood circulation, blood from IVC is forced superiorly
What are the peripheral attachments of the diaphragm to?
inferior margin of osteocartilaginous thoracic cage (ribs and costal cartilages) and superior lumbar vertebrae
Name the two parts of the diaphragm.
peripheral muscular part and central tendon
True or False: The fibers of the peripheral muscular part of the diaphragm converge to the central tendon.
True
Name the three parts of the peripheral muscular part of the diaphragm
- sternal part
- costal part
- lumbar part
The lumbar part of the peripheral muscular part of the diaphragm arises by….
two musculotendinous crura
The ____ _____ ligament arches between the two musculotendinous crura
median arcuate
The ____ _____ ligaments are thickening of the fascia of the psoas major muscle
medial arcuate
The _____ ______ ligaments are thickenings of the fascia of the quadratus lumborum muscle
lateral arcuate
The central tendon is an _________ that fuses with the inferior surface of the fibrous pericardium
aponeurosis
The central tendon has ____ leaves
3 (clover)
The diaphragmatic ______ (______) permit structures to pass between the thorax and abdomen
apertures (hiatuses)
Name the diaphragmatic apertures.
- vena caval
- esophageal
- aortic
What passes through each of the following diaphragmatic apertures:
- vena caval
- esophageal
- aortic
- IVC, some branches of right phrenic nerve, but most branches pass directly through diaphragm
- esophagus, anterior and posterior vagal trunks
- aorta, thoracic duct, azygos vein
Name other structures passing through the diaphragm.
phrenic nerves, musculophrenic vessels, inferior intercostal vessels, subcostal nerves and vessels, sympathetic trunks, greater and lesser splanchnic nerves, hemiazygous vein
What is the blood supply to the superior surface of the diaphragm?
superior phrenic artery
branches of the internal thoracic artery (musculophrenic and pericardiacophrenic)
What is the blood supply to the inferior surface of the diaphragm?
inferior phrenic artery
For venous drainage, the superior surface of the diaphragm is drained by….
pericardiacophrenic, musculophrenic; both empty into the internal thoracic veins
For venous drainage, the inferior surface of the diaphragm is drained by….
inferior phrenic vein, empties into IVC
The entire motor supply and most of the sensory supply to the diaphragm is from the ______ nerves.
phrenic (C3, C4, C5)