L-Spine & Pelvis

Question 1

Rectus Abdominis

Answer 1

O- pubic crest & pubic symphysis

I- costal cartilage ribs 5-7 & xiphoid process

A- flexion of trunk, posterior pelvic tilt

N- intercostal nerves

Question 2

External Abdominal Oblique

Answer 2

O- anterior 1/2 iliac crest, inguinal ligament, pubic tubercle/crest & rectus sheath

I- inferior border ribs 6-12

A- flexion, lateral flexion & contralateral rotation of trunk
posterior pelvic tilt

N- intercostal nerves

Question 3

Internal Abdominal Oblique

Answer 3

O- iliac crest, inguinal ligament, thoracolumbar fascia

I- ribs 10-12 & rectus sheath

A- flexion, lateral flexion &ipsilateral rotation of trunk
posterior pelvic tilt

N- intercostal nerves

Question 4

Transversus Abdominis

Answer 4

O- iliac crest, inguinal ligament, thoracolumbar fascia & lower ribs 7-12 & costal cartilage

I- midline abdominal aponeurosis

A- compression/stabilization of abdomen

N- intercostal nerves

Question 5

Quadratus Lumborum

Answer 5

O- posterior iliac crest & iliolumbar ligament

I- 12th rib (inferior border) & TPs of L1-L4

A- unilateral: elevation of pelvis, lateral flexion of trunk, depression of 12th rib
bilateral: extension of lumbosacral spine

N- lumbar plexus