DEEP Intrinsec Back Muscles: B) Deep Segmental Muscles

Question 1

Interspinales cervicis

Answer 1

O: C1-C7 (between spinous processes of adjacent vertebrae)
I: C1-C7 (between spinous processes of adjacent vertebrae)
N: Spinal nn. (posterior rami)
A: Extends Cervical and lumbar spines

Question 2

Interspinales lumborum

Answer 2

O: L1-L5 (between spinous processes of adjacent vertebrae)
I: L1-L5 (between spinous processes of adjacent vertebrae)
N: Spinal nn. (posterior rami)
A: Bilateral: Stabilizes and extends the cervical and lumbar spines
Unilateral: Bends the cervical and lumbar spines laterally to same side

Question 3

Intertransversarii anteriores cervicis

Answer 3

O: C2-C7 (between anterior tubercles of ajacent vertebrae)
I: C2-C7 (between anterior tubercles of adjacent vertebrae)
N: Spinal nn. (anterior rami)
A: Bilateral: Stabilizes and extends the cervical and lumbar spines
Unilateral: Bends the cervical and lumbar spines laterally to same side

Question 4

Intertransversarii Posteriores cervicis

Answer 4

O: C2-C7 (between posterior tubercles of adjacent vertebrae)
I: C2-C7 (between posterior tubercles of adjacent vertebrae)
N: Spinal nn. (posterior rami)
A: Bilateral: Stabilizes and extends the cervical and lumbar spines
Unilateral: Bends the cervical and lumbar spines laterally to same side

Question 5

Intertransversarii mediales Lumborum

Answer 5

O: L1-L5 (between mammillary processes of adjacent vertebrae)
I: L1-L5 (between mammillary processes of adjacent vertebrae)
N: Spinal nn. (posterior rami)
A: Bilateral: Stabilizes and extends the cervical and lumbar spines
Unilateral: Bends the cervical and lumbar spines laterally to same side

Question 6

Intertransversarii laterales Lumborum

Answer 6

O: L1-L5 (between transverse processes of adjacent vertebrae)
I: L1-L5 (between transverse processes of adjacent vertebrae)
N: Spinal nn. (posterior rami)
A: Bilateral: Stabilizes and extends the cervical and lumbar spines
Unilateral: Bends the cervical and lumbar spines laterally to same side

Question 7

Levatores costarum breves

Answer 7

O: C7-T11 (transverse processes)
I:  Costal angle of next lower rib
N: Spinal nn. (posterior rami)
A: Bilateral: Extends thoracic spine
    Unilateral: Bends thoracic spine to same side, rotates to opposite side

Question 8

Levatores costarum longi

Answer 8

O: C7-T11 (Transverse processes)
I: Costal Angle of rib two vertebrae below
N: Spinal nn. (posterior rami)
A: Bilateral: Extends thoracic spine
Unilateral: Bends thoracic spine to same side, rotates to opposite side