Posterior Ab. Wall, diaphragm, and Retro Structures Flashcards
insertion of the quadratus lumborum?
inferior border of 12th rib and transverse processes of upper 4 lumbar vertebrae
what is the origin of the quadratus lumborum?
iliolumbar ligament + iliac crest
innervation of quadratus lumborum?
ventral rami of T12 to L3/L4 spinal nerves
What is the action of the quadratus lumborum?
fixes the 12th rib down during inspiration
lateral flexion of the lumbar spine
where do the right and left dome of the diaphragm reach on expiration?
right- upper border of 5th rib
left- lower border of 5th rib
what is transmitted through the aortic hiatus?
aorta
thoracic duct
what is transmitted by the esophageal hiatus?
esophagus
anterior/posterior vagal trunks
esophageal branches of the left gastric vessels
what is transmitted by the caval opening?
IVC
what miscellaneous structures pierce the diaphragm?
greater, lesser, and lowest splanchnic n.
sympathetic trunk
right phrenic nerve
left phrenic nerve
what is the sternocostal triangle?
a small gap in the diaphragm between the sternal and costal parts
what is the innervation of the diaphragm?
phrenic nerve (c3-c5)
what are the main actions of the diaphragm?
inspiration
evacuation of pelvic contents (increase abdominal pressure)
weight-lifting
thoracoabdominal pump
what part of the lumbar plexus forms the iliohypogastric and ilioinguinal nerves?
ventral rami of L1
what part of the lumbar plexus forms the genitofemoral nerve?
ventral rami of L2 and dorsal rami of L1
what part of the lumbar plexus forms the obturator nerve?
branch of ventral ramus of L2
ventral ramus of L3
Ventral ramus of L4 (all anterior division)