Torso

Question 1

Rectus abdominis

Answer 1

O: pubic crest and pubic symphysis

I: cartilage of 5th-7th ribs and xiphoid process

A: trunk flexion and posterior pelvic tilt

N: intercostal

Question 2

External oblique

Answer 2

O: surface of 5th-12th ribs

I: anterior iliac crest, abdominal aponeurosis to linea alba

A: trunk flexion, lateral flexion, rotation to opposite side

N: intercostal

Question 3

Internal oblique

Answer 3

O: inguinal ligament, iliac crest and thoracolumbar fascia

I: internal surface of 10th-12th ribs, abdominal aponeurosis to linea alba

A: trunk flexion, lateral flexion, rotation to same side

N: intercostal

Question 4

Transverse abdominis

Answer 4

O: inguinal ligament, iliac crest, thoracolumbar aponeurosis and internal surface of ribs 7-12

I: abdominal aponeurosis to linea alba

A: compress abdominal contents, stabilize low back

N: intercostal

Question 5

Psoas Major

Answer 5

O: transverse processes and bodies of L1-L5

I: lesser trochanter

A: hip flexion and trunk stabilization

N: lumbar plexus

Question 6

Iliacus

Answer 6

O: iliac fossa

I: lesser trochanter

A: hip flexion and trunk stabilization

N: femoral

Question 7

Erector spinae

Answer 7

O: Thoracolumbar aponeurosis, iliac crest, spinous processes of L5-T11

I: posterior ribs, spinous and transverse processes of thoracic and cervical vertebrae, mastoid process

A: extension, lateral flexion

N: spinal nerves

Question 8

Multifidi

Answer 8

O: scrum and transverse processes

I: spinous processes of L5-C2

A: spinal extension and rotation to opposite side

N: intercostal

Question 9

Quadratus lumborum

Answer 9

O: posterior iliac crest

I: 12th rib, transverse processes of L1-L4

A: trunk lateral flexion, elevation of pelvis, extension of spine

N: lumbar plexus