Posterior Abdomen Flashcards
Quadratus Lumborum (origin, insertion, action, innervation)
O: lumbar ligament, posterior part of iliac crest
I: Lower border 12th rib, transverse processes of upper 4th lumbar vertebrae
A: Bends trunk laterally, fixes 12th rib during inspiration
N: T12, L1-L4
Psoas Major (origin, insertion, action, innervation)
O: lumbar vertebrae- transverse processe, sides of bodies, and intervertebral discs
I: lesser trochanter of femur (as iliopsoas tendon)
A: flexes thigh and trunk
N: L2-L4 via lumbar plexus
Psoas Minor (origin, insertion, action, innervation)
O: T12 and L1- transverse processes, sides of bodies, and intervertebral discs
I: iliopubic eminemce
A: weak flexor of trunk
N: L1
Iliacus (origin, insertion, action, innervation)
O: iliac fossa
I: lesser trochanter (iliapsoas tendon)
A: flexes trunk
N: L2-L4 (femoral n.)
Diaphragm (what is it)
musculotendinous sheath that separates abdominal and thoracic cavities
were does the diaphragm insert?
central tendon
what is the central tendon (whats it derived from)
aponeurosis of muscle
derived from the embryonic septum transversum
sternal origin of the diaphragm
two small muscular slips off xiphoid process
costal origin of diaphragm
lower 6 rips (major part of diaphragm)
lumber origin of the diaphragm
right and left crura (legs)
right and left crura (legs) of diaphragm (what are they where do they each originate)
musculotendinous band that originates from the anterior surface of:
right crus- the upper three vertebrae
left crus- upper two vertebrae
the right crus gives rise to what?
suspensory muscle of the duodenum (ligament of Treitz)
what crus is longer?
right crus is longer than the left crus
what unites the crura and where
median arcuate ligament
anterior to aorta
lateral arcuate ligament (what is it)
superior thickening of quadrates lumborum fascia that overlies quadrates lumborum muscle
the arcuate ligaments are continuations of what fascia?
transversalis fascia
the opening for the inferior vena cava pierces the diaphragm at what level and where?
T8
central tendon
during inspiration what happens to the inferior vena cava
diaphragm conracts and dilates the vena canva
the inferior vena cava foramen contains what?
inferior vena cava and branches of right phrenic nerve
esophageal hiatus is at what spinal level and where in the diaphragm?
T10
encircled by right crus
Aortic hiatus is located at what spinal level and where
T12
posterior to diaphragm
what passes through the esophageal hiatus
esophagus
anterior and posterior vagal trunks
esophageal branches of left gastric vessels
what passes through the aortic hiatus
aorta
thoracic duct
azygous vein
The diaphragm gets its blood supply from what arteries (and where do they branch from)
musculophrenic- internal thoracic
pericardiacophrenic- internal thoracic
superior phrenic- thoracic aorta
inferior phrenic- abdominal aorta
retroperitoneal organs in posterior abdomen are positioned between what spinal levels
T12-L3
the hilum of the kidneys lie in what plane
transpyloric
kidney coverings (name them from superficial to deep)
Paranephric fat Renal Fascia (extraperitoneal fascia) Perinephric fat (perirenal fat)
Paranephric fat (what is it)
large amount of fat found only posterior to the kidney
Renal Fascia
later of fascia that encloses the kidneys and suprarenal glands
Perinephric Fat (what is it)
completely surrounds the kidney and allows for slight vertical moment during respiration
renal capsule (what is it)
fibrous capsule covering that invests the kidney (but not suprarenal glands)
the left gonadal vein empties where
left renal vein