posterior abdominal wall muscles

Question 1

psoas major action

Answer 1

flexes thigh
flexes vertebral column laterally
when sitting, flexes trunk

Question 2

iliacus action

Answer 2

flexes thigh

stabilizes hip

Question 3

QL action

Answer 3

extends and laterally flexes vertebral column

fixes 12th rib during inspiration

Question 4

psoas major origin

Answer 4

transverse processes of lumbar vertebrae

sides of vertebral bodies of T12-S1

Question 5

psoas major insertion

Answer 5

less trochanter

Question 6

iliacus origin

Answer 6

superior 2/3 of iliac fossa
ALA of sacrum
anterior sacro-iliac ligaments

Question 7

iliacus insertion

Answer 7

lesser trochanter and shaft inferior to it

Question 8

QL origin

Answer 8

medial half of inferior border of 12th rib

tips of lumbar transverse processes

Question 9

QL insertion

Answer 9

iliolumbar ligament

internal lip of iliac crest

Question 10

psoas major innervation

Answer 10

lumbar plexus via anterior branches of L2-L4

Question 11

iliacus innervation

Answer 11

femoral nerve L2-L4

Question 12

QL innervation

Answer 12

anterior branches of T12-L4