Unit 1 - Back: Transversospinalis Muscles (Ex. I)

Question 1

rotatores breves

Answer 1

O/I: T1-T12 between transverse and spinous processes of adjacent vertebrae
Inn: spinal nerves from P rami
A: together extends T spine; rotates contralaterally; PROPRIOCEPTION

Question 2

rotatores longi

Answer 2

O/I: T1-T12 between transverse and spinous processes, skipping 1 vertebra
Inn: spinal nerves from P rami
A: together extends T spine; rotates contralaterally; PROPRIOCEPTION

Question 3

multifidus

Answer 3

O/I: C2-sacrum between transverse and spinous processes, on mammillary processes of L vertebrae, skipping 2-4 vertebrae
Inn: spinal nerves from P rami
A: together extends spine; ipsilaterally flexes spine and contralaterally rotates

Question 4

semispinalis capitis

Answer 4

O: transverse and articular processes of C4-T7
I: O bone between S and I nuchal lines
Inn: spinal nerves from P rami
A: together extends T and C spines and head (stabilizes craniovertebral joints); ipsilaterally flexes head, C, and T spines and contralaterally rotates

Question 5

semispinalis cervicis

Answer 5

O: transverse processes of T1-T6
I: spinous processes of C2-C5
same O and I as longissimus cervicis except LC I is transverse processes of C2-C5
Inn: spinal nerves from P rami
A: together extends T and C spine and head (stabilizes craniovertebral joints); ipsilaterally flexes head, C, and T spines and contralaterally rotates

Question 6

semispinalis thoracis

Answer 6

O: transverse processes of T6-T12
I: spinous processes of C6-T4
Inn: spinal nerves from P rami
A: together extends T and C spines and head (stabilizes craniovertebral joints); ipsilaterally flexes head, C, and T spines and contralaterally rotates