Deep Layer (intrinsic) Flashcards

1
Q

Semispinalis (thoracis, cervicis, capitis)

-Fibers span 5-6 segments

A

O: transverse process of T1-T6
I: occipital bone
A: bilaterally extends head, unilaterally rotates head to same side
N: dorsal rami of cervical spine nerves

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2
Q

Multifidus

A

O: vertebral arches
I: spinous process spanning 1-3 vertebrae
A: unilaterally flexes the trunk laterally (same), rotates vertebrae to opposite side. Bilaterally extends trunk
N: dorsal rami of spinal nerves

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3
Q

Rotatores

A

O:transverse process of one vertebrae
I: base of spinous process of superior vertebrae
A: rotation of superior vertebrae to opposite side (primary role is proprioceptive)
N: dorsal rami of spinal nerves

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