Muscles of the Deep Back: Transversospinalis

Question 1

Origin and insertion of rotatores longi

Answer 1

T1-T12 between transverse and spinous processes of every other vertebrae

Question 2

Origin and insertion of Multifidus

Answer 2

Transverse and spinous processes from C2-sacrum skipping 2-4 vertebrae

Question 3

Innervation of the rotatores

Answer 3

spinal nerves; posterior rami

Question 4

actions of the rotatores

Answer 4

bilaterally: extend the thoracic spine
unilaterally: rotate spine to the opposite side

Question 5

innervation of the multifidus

Answer 5

spinal nerves; posterior rami

Question 6

actions of the multifidus

Answer 6

bilaterally: extend the spine
unilaterally: flex spine to the same side and rotate the spine to the opposite side

Question 7

origin of the semispinalis capitis

Answer 7

transverse and articular processes of C3-T6

Question 8

insertion of semispinalis capitis

Answer 8

between superior and inferior nuchal lines on the occipital bone

Question 9

origin of the semispinalis cervicis

Answer 9

transverse processes of T1-T6

Question 10

insertion of the semispinalis cervicis

Answer 10

spinous processes of C2-C5

Question 11

origin of semispinalis thoracis

Answer 11

transverse processes of T6-T12

Question 12

insertion of semispinalis thoracis

Answer 12

spinous processes of C6-T4

Question 13

innervation of semispinalis

Answer 13

Spinal nerve; posterior rami

Question 14

action of the semispinalis

Answer 14

bilaterally: extends cervical and thoracic spine and head
stabilizes craniovertebral joints

unilaterally: bend head to the same side and rotates to the opposite side

Question 15

Origin and insertion of the Rotatores brevis

Answer 15

T1-T12 between the transverse and spinous processes of adjacent vertebrae