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22 terms

posterior abdominal wall- lab exam 3

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psoas major muscle
proximal attachment- lumbar vertebrae
insertion- lesser trochanter of the femor
action- strong flexor of the thigh
psoas minor muscle
absent in 40% of cases
iliacus muscle
origin- iliac fossa
insertion- lesser trochanter of the femur
action- flexes the thigh
quadratus lumborum muscle
origin- 12 rib and lumbar transverse process
insertion- iliolumbar ligament & iliac crest
action- flexes vertebral column laterally
transversus abdominis muscle
lies posterior to quadratus lumborum muscle
right and left kidney location
right= 12 rib
left= 11th rib
nerves of the posterior abdominal wall
ventral rami of spinal nerves T12- L4
lumbar plexus
L1-4 formed within psoas major muscle
genitofemoral nerve
L1-2 roots- motor nerve of the creamastor muscle and supplies small area of skin inferior and medial to inguinal ligament
lateral cutaneous nerve of the thight
L2-3. passes deep to inguinal ligament. supplies skin on lateral aspect of the thigh
femoral nerve
L2-4. lateral side of the psoas major muscle in the groove btw psoas major and iliacus muscles
obturator nerve
L 2-4 . supplies motor and sensory innervation to medial thigh
lumbosacral trunk
ventral rami L4-5.
sympathetic trunk
found on ventral body btw crus of diaphragm and psoas major muscle- sympathetic division of the autonomic nervous system
lumbar splanchnic nerves
pass anteriorly from sympathetic trunk to the aortic autonomic nervev plexus- parasympathetic
rami communicans
pass posterirly from sympathetic ganglia to lumbar ventral rami
central tendon
aponeurotic center of diaphragm
right and left crus of diaphragm
greater splanchnic nerve pierces this to enter abdominal cavity
right= L1-3. esophageal hiatus opening in right crus
left= L1-2
arcuate ligaments
thickenings of fascia that serve as proximal attachments for some of the muscle fibers of the diaphragm
phrenic nerves
innervate diaphragm. supplie most sensory innervation to abdominal and thoracic surfaves of diaphragm
what is the innervation of the pleural and peritoneal coverings of the diaphragm
sensory fibers from lower intercostal nerves T5-11 and subcostal nerve
celiac ganglia
found on left and right sides of celiac trunk. largest of sympathetic ganglia that are located on surface of the aorta