Intrinsic back muscles, Deep

Question 1

Origin/insertion of Rotatores longi?

Answer 1

T1-T12 (between transverse and spinous processes, skipping one vertebrae)

Question 2

Innervation of Rotatores?

Answer 2

Spinal nn. (posterior rami)

Question 3

Origin/insertion of Rotatores breves?

Answer 3

T1-T12 (between transverse and spinous processes of adjacent vertebrae)

Question 4

Action of Rotatores?

Answer 4

Bilateral:extends thoracic spine
Unilateral: rotates spine to opposite side (rotates spine contralateral)

Question 5

Innervation of multifidus?

Answer 5

Spinal nn. (posterior rami)

Question 6

Action of multifidus?

Answer 6

Bilateral: extends spine
Unilateral: flexes spine to same side, rotates to opposite side (flexes spine ipsilateral, rotates contralateral)

Question 7

Oirigin of semispinalis capitis?

Answer 7

C4-T7 (transverse and articular processes)

Question 8

Insertion of Semispinals capitis?

Answer 8

Occipital bone (between superior and inferior nuchal lines)

Question 9

Origin of semispinalis cervicis?

Answer 9

T1-T6 (transverse proceses)

Question 10

Insertion of Semispinalis cervicis?

Answer 10

C2-C5 (spinous processes)

Question 11

Origin of semispinalis thoracis?

Answer 11

T6-T12 (transverse processes)

Question 12

Insertino of Semispinalis thoracis?

Answer 12

C6-T4 (spinous processes)

Question 13

Innervation of semispinalis?

Answer 13

Spinal nn. (posterior rami)

Question 14

Action of semispinalis?

Answer 14

Bilateral: extends thoracic and cervical spines and head (stabilizes craniovertebral joints)

Unilateral: bends head, cervical and thoracic spines to same side (ipsilateral), rotates to opposite side (rotates contralateral)

Question 15

Origin/insertion of Multifidius?

Answer 15

C2-Sacrum (between transverse and spinous processes, skipping two or four vertebrae)