Posterior Abdominal Wall

Question 1

Psoas Major O

Answer 1

transverse processess of lumbar vertebra
sides of bodies of T12-S1
intervening IV discs

Question 2

Psoas Major I

Answer 2

tendond of lesser trochanter of the femur

Question 3

psoas major innervation

Answer 3

lumbar plexus via anterior branches L2-L4

Question 4

psoas major action

Answer 4

Inferiorly: acts with iliacus and flexes thigh

superiorly: flexes vertebral column laterally (balance trunk)
sitting: acts inferiorly with iliacus to flex trunk

Question 5

iliacus O

Answer 5

superior 2/3 of iliac fossa
ala of sacrum
anterior sacro-iliac ligament

Question 6

iliacus I

Answer 6

lesser trochanter of femur and shaft inferior to it

psoas major tendon

Question 7

iliacus innervation

Answer 7

femoral nerve (L2-L4)

Question 8

iliacus action

Answer 8

flexes thigh
stabilizes hip
acts with psoas major

Question 9

quadratus lumborum O

Answer 9

medial 1/2 of inferior border of 12th rib

tips of lumbar transverse processess

Question 10

quadratus lumborum I

Answer 10

iliolumbar ligament

internal lip of iliac crest

Question 11

qudratus lumborum innervation

Answer 11

anterior branches of T12 and L1-L4 nerves

Question 12

quadratus lumborum action

Answer 12

extends and laterally flexes vertebral column

fixes 12th rib during inspiration

Question 13

what does the diaphragm do during inspiration?

Answer 13

descends

Question 14

diaphragm fixed origin

Answer 14

inferior margin of the thoracic cage and superior lumbar vertebrae

Question 15

diaphragm insertion

Answer 15

central tendon

Question 16

diaphragm origin

Answer 16

sternal part: two muscualr slips that attach to posterior aspect of xiphoid process of sternum

costal part: wide muscualr slips that attach to internal surfaces of inferior six costal cartilages and their adjoining ribs (this part forms the domes of the diaphragm)

lumbar part: arising from two aponeurotic arches; medial and lateral arcuate ligaments and three superior lumbar vertebraw, this part forms the left and right muscualr crura hat ascends into the central tendon