DEEP Intrinsec Back Muscles: A) Transversospinalis group

Question 1

Rotatores Breves

Answer 1

O: T1-T12 (between transverse and spinous processes of adjacent vertebrae)
I: T1-T12 (between transverse and spinous processes of adjacent vertebrae)
N: Spinal nn. (posterior rami)
A: Billateral: Extends thoracic spine
Unilateral: Rotates spine to opposite side

Question 2

Rotatores Longi

Answer 2

O: T1-T12 (Between transverse and spinous processes, skipping one vertebra)
I: T1-T12 (Between transverse and spinous processes, skipping one vertebra)
N: Spinal nn. (posterior rami)
A: Billateral: Extends thoracic spine
Unilateral: Rotates spine to opposite side

Question 3

Multifidus

Answer 3

O: C2-sacrum (between transverse and spinous processes, skipping two to four vertebrae)
I: C2-sacrum (between transverse and spinous processes, skipping two to four vertebrae)
N: Spinal nn. (posterior rami)
A: Billateral: Extends spine
Unilateral: Flexes spine to same side, rotates to opposite side

Question 4

Semispinalis capitis

Answer 4

O: C4-T7 (transverse and articular processes)
I: Occipital bone (between superior and inferior nuchal lines)
N: Spinal nn. (posterior rami)
A: Billateral: Extends thoracic and cervical spines and head (stabilizes craniovertebral joints)
Unilateral: Bends head, cervical and thoracic spines to same side, rotates to opposite side

Question 5

Semispinalis cervicis

Answer 5

O: T1-T6 ( transverse processes)
I: C2-C5 (spinous processes)
N: Spinal nn. (posterior rami)
A: Billateral: Extends thoracic and cervical spines and head (stabilizes craniovertebral joints)
Unilateral: Bends head, cervical and thoracic spines to same side, rotates to opposite side

Question 6

Semispinlis thoracis

Answer 6

O: T6-T12 (transverse processes)
I: C6-T4 (spinous processes)
N: Spinal nn. (posterior rami)
A: Billateral: Extends thoracic and cervical spines and head (stabilizes craniovertebral joints)
Unilateral: Bends head, cervical and thoracic spines to same side, rotates to opposite side