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

Question 1

serratus posterior superior

Answer 1

O: nuchal ligament; spinous processes of C7-T3
I: superior borders of ribs 2-4
Inn: spinal N T2-T5 from A rami
A: elevates ribs

Question 2

serratus posterior inferior

Answer 2

O: spinous processes of T11-L2
I: I borders of ribs 8-12 near angles
Inn: spinal N T9-T12 from A rami
A: depresses ribs

Question 3

splenius capitis

Answer 3

O: nuchal ligament; spinous processes of C3-C7
I: L S nuchal line of O bone; mastoid process of O bone
Inn: spinal N C1-C6 from P rami, L branches
A: together extends C spine and head; ipsilaterally flexes and rotates head

Question 4

splenius cervicis

Answer 4

O: spinous processes of T3-T6
I: transverse processes of C1-C2 (wraps underneath capitis)
Inn: spinal N C1-C6 from P rami, L branches
A: together extends C spine and head; ipsilaterally flexes and rotates head