Musces of Posterior Abdominal Wall

Question 1

Diaphragm

Answer 1

A: xiphoid process, lower six costal cartilages, L1-L3 vertebrae, converges into central tendon

A: draws central tendon down and forward during inspiration

N: phrenic N

B: musculophrenic, superior and inferior phrenic arteries

Question 2

Quadratus Lumbroum

Answer 2

A: Inferior border of 12th rib, lumber transverse processes, illiolumbar ligament, iliac crest

A: depresses and stabilized rib 12 (during inspiration), some lateral bending of trunk

N: Anterior rami of T12, L1 to L4

B: iliolumbar artery

Question 3

Psoas Major

Answer 3

A: Lateral surface of bodies T12-L5, vertebrae, transverse processes of lumbar vertebrae, intervening intervertebral discs (between T12-L5). Lesser trochanter of femur

A: flexion of hip at hip joint

N: Anterior rami L1 to L3

B: lumbar branches of iliolumbar artery

Question 4

Psoas Minor

Answer 4

A: lateral surface of bodies T12 to L1 vertebrae, and intervening intervertebral discs, pectineal line of pubis and illopubic eminence

A: weak flexion if lumar vertebral column

N: Anterior rami of L1

B: lumbar branch of iliolumbar A

Question 5

Iliacus

Answer 5

A: superior 2/3 of iliac fossa, anterior sacro-iliac ligaments, ala of sacrum, lesser trochanter of femur

A: flexion of thigh at hip joint

N: femoral N. (L2 to L4)

A: iliac branch of iliolumbar A