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I. SPINOTRANSVERSE MUSCLES (2)
most superficial of the back muscles only present in neck and upper thorax
most superficial of the extenser muscles
attaches to the occipital bone of the head
3. Iliocostalis muscle
most lateral of the three erector spinae MM's
laterally flexes vertebral column
III. TRANSVERSOSPINALIS MUSCLE (2)
angle laterallyorigin near transverse process
to insertion at base of spinous process
covered by illiocostalis so to work them you have to go through illocostais first
extends vertebral column
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