Unit 1 Exam Posterior Abdominal Wall

Question 1

Psoas major muscle

Answer 1

proximal attachment: transverse processes, vertebral bodies and discs of T12-L5

distal attachment: lesser trochanter of the femur

primary actions: hip flexion and external rotation

innervations: anterior rami in upper lumbar region

Question 2

Psoas minor muscle

Answer 2

proximal attachment: T12-L1 vertebrae

distal attachment: pectineal line

primary actions: weak trunk flexion and weak posterior pelvic tilt

innervations: anterior rami of L1

Question 3

Quadratus lumborum muscle

Answer 3

proximal attachment: lumbar transverse process, iliolumbar ligament, iliac crest

distal attachment: lumbar transverse processes, rib 12

primary actions: stabilize rib 12 and lateral flexion trunk

innervations: anterior rami of T12-L4

Question 4

Iliacus muscle

Answer 4

proximal attachment: iliac fossa, lateral sacrum, iliolumbar ligament

distal attachment: lesser trochanter of femur

primary actions: hip flexion and external rotation

innervation: femoral nerve (L2-L4)