Muscles Of The Back

Question 1

Erector spinae

Answer 1

Individual muscles: iliocostalis, longissimus, spinalis
O: nuchal ligament, thoracic and lumbar vertebrae, sacrum, ilium ribs 3-12
I: all ribs, all thoracic vertebrae, temporal bones
A: extends and rotates vertebral column and head
N: dorsal rami of spinal nerves

Question 2

Splenius

Answer 2

O: nuchal ligament, C7-T6
I: C2-4, occipital and temporal bone
A: extends and rotates head
N: middle and lower cervical nerves

Question 3

Semispinalis

Answer 3

O: C4-T10
I: occipital bone and spinal processes of C2-T5
A: extends and rotstes head and vertebral column
N: cervical and thoracic spinal nerves

Question 4

Quadratud lumborum

Answer 4

O: iliac crest
I: L1-4, rib 12
A: extends and abducts vertebral column
N: T12, L1-4

Question 5

Multifidus

Answer 5

O: vertebrae C4-L5, sacrum, ilium
I: vertebral column
A: extends and rotates vertebral column
N: dorsal rami of spinal nerves