14. Posterior Abdominal Wall Flashcards
What are the attachments and origin of quadratus lumborum?
Iliac crest
To 12th rib and L1 - L4 transverse process
What are the functions of quadratus lumborum?
One - bends trunk
Two - pressure/ forced expiration and support for 12th rib
What is the nerve supply of quadratus lumborum?
T12 - L4 anterior rami
What ligament under the diaphragm arches across the upper part of quadratus lumborum?
Lateral arcuate ligament
What are the attachment and origin of iliacus?
Illiac fossa
To lesser trochanter of femur
What is the function of iliacus?
Hip flexion
What is the nerve supply of iliacus?
Femoral nerve
What are the attachments and origins of psoas muscle?
Superficial part - T12 - L4 bodies and IV discs
Deep part - L1 - L5
Inserts - lesser trochanter of femur
What are the functions of psoas?
Hip flexion
One - bend trunk laterally
Both - raise trunk from supine
Innervation of psoas?
L2 - L4
What is the name given to the tendonous fascia that arches over psoas as it passes through the diaphragm?
Medial arcuate ligament
What are the right and left crus of the diaphragm?
Two tendonous structures that extend below the diaphragm to the vertebral column
R –> L1 - L3
L–> L1 - L2
At what vertebral level is the aortic aperture of diaphragm?
T12
At what vertebral level does the abdo aorta bifurcate into common iliac?
L4
MAKE SURE YOU CAN LABEL DIAGRAM OF ARTERIES OF ABDO
SLIDE 11
At what vertebral level does the common iliac vein unite to form the IVC?
L5
Where does the IVC drain?
Right atrium
MAKE SURE YOU CAN LABEL DIAGRAM OF VEINS OF ABDO
SLIDE 13
Where do the lumbar veins drain?
1 + 2 - ascending lumbar
3 + 4 - IVC
5 - iliolumbar vein then common iliac
At what vertebral level do the gonadal arteries branch from the abdo aorta?
L2
Into which veins do the gonadal veins drain?
R –> IVC
L –> left renal
What are the named nerves of the lumbar plexus? (6)
Iliohypogastric Ilioinguinal Genitofemoral Lateral femoral cutaneous Obturator Femoral
Nerve roots of iliohypogastric?
L1
What does iliohypogastric nerve supply?
Sensory - lateral gluteal skin and pubic skin
Motor - internal oblique and transversus abdominis
Nerve roots of ilioinguinal?
L1
What does ilioinguinal nerve supply?
Sensory - skin of medial thigh and root of penis/ scrotum or mons pubis/ labium major
Motor - internal oblique and transversus abdominis
Nerve roots of genitofemoral?
L1 and L2
What does genitofemoral nerve supply?
Sensory - scrotum or mons pubis and skin of upper anterior thigh
Motor - cremasteric muscle
Nerve roots of lateral cutaneous nerve of thigh?
L2 and L3
What does lateral cutaneous nerve of thigh supply?
Sensory - skin of anterior and lateral thigh
Nerve roots of femoral nerve?
L2 - L4
What does femoral nerve supply?
Sensory - skin of anterior thigh and medial leg
Motor - pectineus, iliacus and anterior compartment of thigh
Nerve roots of obturator nerve?
L2 - L4
What does obturator nerve supply?
Sensory - skin on medial thigh
Motor - obturator externus and medial compartment of thigh
