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
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
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