Posterior Abdominal Wall

Question 1

What are the structures forming the posterior abdominal wall

Answer 1

Lumbar Vertebrae
Thoracolumbar fascia
Psoas major and minor
ilacus
Quadratus Lamborum
Lumbar plexus

Question 2

Which Lumbar Vertrebae is atypical

Answer 2

5th

Question 3

Features of Typical Lumbar Vertebrae

Answer 3

1. Body is large, kidney shaped
2. Vertebral Foramen is triangular and larger than thoracic vertebrae
3. Pedicles are short and project backwards
4. Laminae are short thick and broad
5. spine is directed forwards and downwards
6. Transverse processes are thin and tapering
7. Distance between superior articular facets is more than inferior

Question 4

Features of 5th/atypical vertebrae

Answer 4

1. Body is the largest
2. Transverse processes are thick and short and pyrimidal
3. Distance between inferior articular facts is equal/more than superior

Question 5

Action and nerve supply of psoas major

Answer 5

L2, L3, L4

1. flexes hip joint with iliacus
2. maintains stability at hip
3. weak medial rotator

Question 6

Action and supply of psoas minor

Answer 6

L1

weak flexor of trunk

Question 7

Action and supply of Ilaicus

Answer 7

Femoral nerve

flexes hip joint with psoas major

Question 8

action and supply of quadratus lamborum

Answer 8

Ventral rami of T12-L4

1. fixes last rib during inspiration
2. lateral flexion of vertebral column
3. extend lumbar vertebral column

Question 9

Psoas abcess

Answer 9

Tubercular infection from vertebrae track down to psoas sheath in thigh produing soft swelling in femoral triangle.
causes
Laterally roated lower limb following fracture of femur neck