ANAT30008 Lecture Notes - Lecture 10: Left Atrioventricular Orifice, Chordae Tendineae, Posterior Intercostal Veins

• School: University of Melbourne
• Department: Anatomy and Neuroscience
• Course: ANAT30008

Document Summary

Posteriorly: psoas major (medial arcuate lig), quadratus lamborum (lateral arcuate lig) Aorta (median arcuate lig right crus (l1-3/4) left crus (l1-2/3: ivc pierces at t8- when diaphragm contracts downwards, pulls on the side walls of the ivc allowing more blood through. Oesophagus at t10- fibres of the right crus form a sling around it that closes off the oesophagus upon contraction of the diaphragm, prevents reflux from abdomen up. Other: phrenic nerves, azygous and hemiazygous veins, sympathetic trunk and splanchnic nerves: diaphragm motor innervation is by the right and left phrenic nerves. Sensory innervation to the central part of the diaphragm and to pericardium also by phrenic nerves. Sensory innervation to the periphery of diaphragm is by lower intercostal nerves. Pain from central diaphragm referred to (c3,4,5), pain from periphery referred to lower thoracic wall dermatomes: inspiration occurs when the diaphragm contracts, pulling the lungs downwards and increasing the volume.