Core Muscles

Question 1

Quadratus Lumborum

Answer 1

Origin -
Iliac Crest

Insertion -
12th Rib
Transverse process of L1 - L4

Actions -
Lateral flexion of the spine
Lateral extension of the spine

Question 2

Rectus Abdominals

Answer 2

Origin -
Pubis

Insertion -
Sternum

Actions -
Flexion of the spine
Lateral flexion of the spine

Question 3

External Obliques

Answer 3

Origin -
Ribs

Insertion -
Ilium
Pubis

Actions -
Rotation of the spine
Lateral flexion of the spine

Question 4

Internal Obliques

Answer 4

Origin -
Ribs
Ilium

Insertion - 
Ilium
Pubis
Ribs
Linea Alba

Actions -
Rotation of spine
Lateral flexion of spine

Question 5

Transverse Abdominals

Answer 5

Origin -
Iliac Crest
Lumbar fascia

Insertion -
Pubis
Linea alba

Actions -
Support internal organs
Forced expiration

Question 6

Diaphragm

Answer 6

Origin -
Xiphoid process
Inner surface of the lower six costal cartilages

Insertion -
Centreal aponeurotic tendon

Actions -
Inspiration
Forced inspiration

Question 7

Intercostals

Answer 7

Origin -
Ribs
Costal cartilages

Insertion -
Superior border of next rib below

Actions -
Elevates ribs
Aids in respiration