Muscles of the Back

Question 1

Iliocostalis

Answer 1

O - Iliac crest and sacrum
I - Angles of Ribs
A - Extends and laterally bends trunk and neck
Nerve - Dorsal primary rami of C4-S5
Art - Deep cervical artery
Posterior intercostal arteries
Subcostal Artery
Lumbar arteries

Question 2

Longissimus

Answer 2

O - TVPs at inferior vertebral levels
I - TVP’s at superior vertebral levels and mastoid process
A - Extends and laterally bends trunk and neck
Nerve - Dorsal primary rami C1-S1
Art - Deep cervical artery
Posterior intercostal arteries
Subcostal Artery
Lumbar arteries

Question 3

Spinalis

Answer 3

O - SP’s of vertebrae below
I - SP’s of vertebrae above, and base of the skull
A - Extends and laterally bends the trunk and neck
Nerve - Dorsal primary rami C2-L3
Art - Deep cervical artery
Posterior intercostal arteries
Subcostal Artery
Lumbar arteries

Question 4

Interspinales

Answer 4

O - Upper border of SP’s
I - Lower border of SP’s above
A - Extends trunk and neck
Nerve - Dorsal primary rami C1-L5
Art -Deep cervical artery
Posterior intercostal arteries
Subcostal Artery
Lumbar arteries

Question 5

Intertransversarii

Answer 5

O - Upper border of TVP’s
I -Lower border of TVP’s above
A -Laterally bends trunk and neck
Nerve - Dorsal Primary rami spinal nerves C1-L5
Art -Deep cervical artery
Posterior intercostal arteries
Subcostal Artery
Lumbar arteries

Question 6

Multifidus

Answer 6

O - Sacrum, TVP’s C3-L5
I - SP’s 2-4 vertebral levels above origin
A - Extends and laterally bends trunk and neck, rotates to opposite side
Nerve - Dorsal primary rami C1-L5
Art -Deep cervical artery
Posterior intercostal arteries
Subcostal Artery
Lumbar arteries

Question 7

Rotatores

Answer 7

O - TVP’s
I -Long - SP’s two vertebrae above
Short - SP’s 1 vertebrae above
A - Rotates vertebral column to opposite side
Nerve - DPR C1-L5
Art -Deep cervical artery
Posterior intercostal arteries
Subcostal Artery
Lumbar arteries

Question 8

Semispinalis

Answer 8

O - TVP’s C7-T12
I - Capitis - Back of skull between nuchal lines
Cervicis and thoracis - SP’s 4-6 vertebrae above
A - Extends and laterally bends trunk, rotates trunk to opposite side
Nerve - DPR C1-T12
Art -Deep cervical artery
Posterior intercostal arteries
Subcostal Artery
Lumbar arteries

Question 9

Splenius Capitis

Answer 9

O - Nuchal ligament and SP’s C7-T6
I - Mastoid process and lateral end of superior nuchal line
A - Extends and laterally bends neck and head, rotates head to same side
Nerve -DPR C2-C6
Art - Deep cervical and posterior intercostal

Question 10

Splenius cervicis

Answer 10

O - Nuchal ligament and SP’s C7-T6
I - Posterior tubercles of TVP’s C1-C3
A - Extends and laterally bends neck and head, rotates head to same side
Nerve -DPR C2-C6
Art - Deep cervical and posterior intercostal

Question 11

Obliquus Capitis inferior

Answer 11

O - SP of C2
I - TVP of C1
A - Rotates head to same side
Nerve - Suboccipital nerve DPR of C1
Art - Occipital artery

Question 12

Obliquus Capitis superior

Answer 12

O -TVP of C1
I - Occipital bone above inf nuchal line
A - Extends head, rotates head to same side
Nerve - Suboccipital nerve DPR of C1
Art - Occipital artery

Question 13

Rectus capitis posterior major

Answer 13

O - SP of C2
I - Inf nuchal line
A - Extends head, rotates head to same side
Nerve - Suboccipital nerve DPR of C1
Art - Occipital artery

Question 13

Rectus capitis posterior minor

Answer 13

O - Post. tubercle of C1
I - Medial inf. Nuchal line
A - Extends head
Nerve - Suboccipital nerve DPR of C1
Art - Occipital artery