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

2. DPR

3. extrinsic back muscles
Superficial layer of
extrinsic back muscles

6. extrinsic back muscles
Erector Spinae:
intermediate layer of
extrinsic back muscles

7. Spinalis:
capitis
cervicis
thoracis

8. Longissimus:
capitis
cervicis
thoracis

9. Iliocostalis:
cervicis
thoracis
lumborum

10. Deep layer of intrinsic back muscles:
Transversospinal
muscle group
Semispinalis
Mulitifidus
Rotatores

21. ipsilateral
rotators
contralateral
rotators

22. deep neck muscles that, acting bilaterally, extend the neck:
1 – semispinalis cervicis and iliocostalis 5 – longissimus capitis
2 – splenius cervicis and levator scapulae 6 – semispinalis capitis
3 – splenius capitis trapezius
4 – multifidus

23. Minor deep layer of intrinsic back
muscles:

25. Suboccipital
Region:

26. Supoccipital triangle boundaries:
superomedial
Rectus Capitis Posterior Major
superolateral
Superior Oblique
inferolateral
Inferior Oblique

30. suboccipital triangle floor and contents
and suboccipital n.