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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
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
7 - trapezius
4 – multifidus
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.
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