Intrinsic back muscles

(deep back muscles): act on the vertebral column maintain posture

DPR

Superficial layer of extrinsic back muscles

Erector Spinae: intermediate layer of extrinsic back muscles

Spinalis:

capitis cervicis thoracis

Longissimus:

capitis cervicis thoracis

Iliocostalis:

cervicis thoracis lumborum

Deep layer of intrinsic back muscles: Transversospinal muscle group

Semispinalis Mulitifidus Rotatores

ipsilateral rotators contralateral rotators

1 2

deep neck muscles that, acting bilaterally, extend the neck:

– semispinalis cervicis and iliocostalis – splenius cervicis and levator scapulae 3 – splenius capitis 4 – multifidus 5 – longissimus capitis 6 – semispinalis capitis 7 - trapezius

Minor deep layer of intrinsic back muscles:

Suboccipital Region:

Supoccipital triangle boundaries:

superomedial

Rectus Capitis Posterior Major

superolateral

Superior Oblique

inferolateral

Inferior Oblique

suboccipital triangle floor and contents

and suboccipital n.