Abdomen (Posterior Wall) & Transversus Abdominus ("Lateral")

Question 1

Quadratus lumborum (origin)

Answer 1

• medial 1/2 of the inferior border of the 12th rib
• tips of lumbar transverse processes

Question 2

Quadratus lumborum (insertion)

Answer 2

• iliolumbar ligament
• internal lip of the iliac crest

Question 3

Quadratus lumborum (action)

Answer 3

• extends and laterally flexes the vertebral column
• fixes 12th rib during inspiration

Question 4

Quadratus lumborum (innervation)

Answer 4

ventral rami

Question 5

Quadratus lumborum (blood supply)

Answer 5

iliolumbar artery

Question 6

Psoas major (origin)

Answer 6

bodies and transverse processes of lumbar vertebrae (L1-L5)

Question 7

Psoas major (insertion)

Answer 7

lesser trochanter of femur

Question 8

Psoas major (action)

Answer 8

hip flexion, hip hikePs

Question 9

Psoas major (innervation)

Answer 9

lumbar nerves 2-4

Question 10

Psoas major (blood supply)

Answer 10

iliolumbar artery

Question 11

Psoas minor (origin)

Answer 11

• vertebral margins of T12-L1 vertebrae and corresponding intervertebral discs

Question 12

Psoas minor (insertion)

Answer 12

pectineal line on superior ramus of pubic

Question 13

Psoas minor (action)

Answer 13

flexes pelvis onto vertebral column

Question 14

Psoas minor (innervation)

Answer 14

ventral rami

Question 15

Psoas minor (blood supply)

Answer 15

lumbar branch of iliolumbar artery

Question 16

Transversus abdominus (origin)

Answer 16

thoracolumbar fascia, lateral 1/2 of inguinal ligament, tips of lower 6 ribs, anterior iliac crest

Question 17

Transversus abdominus (insertion)

Answer 17

linea alba

Question 18

Transversus abdominus (action)

Answer 18

compression of abdominal viscera

Question 19

Transversus abdominus (innervation)

Answer 19

lower intercostal nerves, L1

Question 20

Transversus abdominus (blood supply)

Answer 20

posterior intercostal and subcostal arteries, superior/inferior epigastric arteries