Unit 1 - Back: Intermediate Intrinsic Back Muscles (Ex. I)

Question 1

iliocostalis cervicis

Answer 1

O: ribs 3-7
I: transverse processes of C4-C6
Inn: spinal N C8-L1 from P rami, L branches
A: together extends spine; ipsilaterally flexes spine

Question 2

iliocostalis thoracis

Answer 2

O: ribs 7-12
I: ribs 1-6
Inn: spinal N C8-L1 from P rami, L branches
A: together extends spine; ipsilaterally flexes spine

Question 3

iliocostalis lumborum

Answer 3

O: sacrum; iliac crest; superficial thoracolumbar fascia
I: ribs 6-12; deep thoracolumbar fascia; transverse processes of upper L vertebrae
Inn: spinal N C8-L1 from P rami, L branches
A: together extends spine; ipsilaterally flexes spine

Question 4

longissimus capitis

Answer 4

O: transverse processes of T1-T3; transverse and articular processes of C4-C7
I: mastoid process of T bone
Inn: spinal N C1-L5 from P rami, L branches
A: together extends head; ipsilaterally flexes and rotates head

Question 5

longissimus cervicis

Answer 5

O: transverse processes of T1-T6
I: transverse processes of C2-C5
Inn: spinal N C1-L5 from P rami, L branches
A: together extends spine; ipsilaterally flexes spine

Question 6

longissimus thoracis

Answer 6

O: sacrum; iliac crest; spinous processes of L vertebrae and transverse processes of lower T vertebrae
I: ribs 2-12; transverse processes of L and T vertebrae
Inn: spinal N C1-L5 from P rami, L branches
A: together extends spine; ipsilaterally flexes spine

Question 7

spinalis cervicis

Answer 7

O: spinous processes of C5-T2
I: spinous processes of C2-C5
Inn: spinal nerves from P rami
A: together extends C and T spine; ipsilaterally flexes C and T spine

Question 8

spinalis thoracis

Answer 8

O: spinous processes, L surfaces of T10-L3
I: spinous processes, L surfaces of T2-T8
Inn: spinal nerves from P rami
A: together extends C and T spine; ipsilaterally flexes C and T spine