Spinal Muscles

Question 1

Erector Spinae

Answer 1

Origin -
Sacrum
Ilium
Ribs

Insertion -
Ribs
Vertebrae
Occipital Bone

Actions -
Extension
Lateral flexion of the spine

Question 2

Multifidus

Answer 2

Origin -
Posterior superior iliac spine
Transverse process of lumbar, thoracic and C4-C7 vertebrae

Insertion -
Spinous process of 2nd - 4th vertebrae above each origin

Actions -
Extension of vertebrae column
Rotation of vertebae column

Question 3

Longissimus

Answer 3

Origin -
Transverse process of the lumbar vertebrae
Transverse process of the thoracic vertebrae

Insertion -
Ribs and transverse process of cervical vertebrae
Mastoid process

Actions -
Lateral flexion of the neck
Extension of the vertebrae column

Question 4

Iliocostalis

Answer 4

Origin - 
Sacrum
Iliac Crest
Spinous Processes of lumbar
Lower thoracic vertebrae

Insertion -
Ribs
Transverse processes of cervical vertebrae

Actions -
Lateral flexion of the neck
Extension of the vertebral column

Question 5

Spinalis

Answer 5

Origin -
Spinous processes of lumbar vertebrae
Spinous process of thoracic vertebrae

Insertion -
Spinous process of the upper thoracic vertebrae
Spinous process of the upper cervical vertebrae

Actions -
Lateral flexion of the neck
Extension of the vertebrae column

Question 6

Lavator Scapulae

Answer 6

Origin -
Transverse process of C1-C4

Insertion -
Superior angle of Scapula

Actions -
Elevation of the shoulder girdle
Lateral flexion of the neck