Muscles Of The Deep Back Flashcards
Erector spinae muscles
Iliocostalis (lateral)
Longissimus (middle)
Spinalis (medial)
Innervated by the ventral rami
Action: bilaterally extends the lumbar spine, unilaterally does side bending
Iliocostalis origin and insertion
O: iliac crest
I: ribs
Longissimus origin and insertion
O: lower ribs
I: higher ribs
Spinalis origin and insertion
O: sides of lower spinous processes
I: sides of higher spinous processes
Transversospinalis muscles
Semispinalis (4-6 segments)
Rotatores (1-2 segments)
Multifidus (3-4 segments)
O: transverse processes I: spinous processes Inner aged by dorsal rami Action: contra-lateral trunk rotation Multifidus is a main local core stabilizer
Superior oblique
O: transverse process C1
I: skull
Innervation: dorsal rami
Action: extends head, side bend head
Inferior oblique
O: spinous process C2
I: transverse process C1
Innervation: dorsal rami
Action: rotates head same side
Rectus capitis posterior major
O: spinous process C2
I: skull
Dorsal rami
Action: ipsilateral rotation
Rectus capitis posterior minor
O: transverse process C1
I: skull
Dorsal rami
Action: ipsilateral rotation
Rectus capitis lateralis
O: transverse process C1
I: skull
Dorsal rami
Action: side bend head
Rectus capitis anterior
O: transverse process C1
I: foramen magnum
Dorsal rami
Action: side bend head
Longus capitis/colli
Flex the neck, cervical spin stability
