Lecture 10: Posterior Abdominal Wall

Question 1

psoas major attachments

Answer 1

superior: transverse processes, bodies and intervertebral discs of T12-L5
inferior: lesser trochanter of femur

Question 2

psoas major innervation

Answer 2

anterior primary rami of L2-L4

Question 3

psoas major actions

Answer 3

hip flexion

Question 4

what two muscles combine to make iliopsoas m.

Answer 4

psoas major and iliacus

Question 5

iliacus attachments

Answer 5

superior: superior part of iliac fossa
inferior: lesser trochanter of femur

Question 6

iliacus innervation

Answer 6

femoral n.

Question 7

iliacus actions

Answer 7

hip flexion

Question 8

quadratus lumborum attachments

Answer 8

superior: lower border of rib 12 and transverse processes of L1-L4
inferior: iliolumbar ligament and adjacent iliac crest

Question 9

quadratus lumborum innervation

Answer 9

subcostal n. and anterior primary rami of L1-L4

Question 10

quadratus lumborum actions

Answer 10

“hip hiker” muscle; ipsilateral flexion and extension (acting bilaterally) of lumbar vertebral column; accessory to inspiration (stabilizes rib 12)

Question 11

subcostal n.

Answer 11

supplies mm. of anterior abdominal wall and quadratus lumborum m.

Question 12

genitofemoral n.

Answer 12

genital branch supplies cremaster m. and skin of scrotum and labia major; femoral branch supplies skin of femoral triangle

Question 13

lateral femoral cutaneous n.

Answer 13

sensory to anterolateral thigh

Question 14

femoral n.

Answer 14

supplies iliacus and anterior thigh mm.

Question 15

obturator n.

Answer 15

supplies adductors of femur, transversing obturator foramen to reach medial thigh

Question 16

lumbosacral trunk

Answer 16

crosses brim of pelvis to contribute to sacral plexus

Question 17

If the head of the femur is dislocated postero-medially, compression of which nerve is likely to result?

Answer 17

sciatic n.