+ Vertebral Movement
one curve ends then next begins
Exaggerated curve (vs flat & rigid)
flat back – loss of lumbar lordosis
Cervical & lumbar
Layers of the Intrinsic Back Muscles
Both Splenius muscles
Erector Spinae (bilateral and
Designated by region from
medial to lateral
Designated by insertion
Interconnect and stabilize the
Small muscles that make fine
adjustments to vertebra
Divisions of the sacrospinalis (aka
Lateral Column. Intermediate Column. Medial Column.
Iliocostalis Longissimus Spinalis.
(a) I. lumborum. (a) L. dorsi. (a) S. dorsi.
(b) I. dorsi. (b) L. cervicis. (b) S. cervicis.
(c) I. cervicis. (c) L. capitis. (c) S. capitis.
Sacrum, spinous processes of
lower two thoracic & all
Transverse and spinous
processes as well as ribs and
Extension (C & L)
(C & L)
Iliocostalis Longissimus Spinalis
Muscle is thickest in S & L regions
Controls forward flexion
Extension of trunk
Post pelvic tilt & curvature LS
Flattens lower back
What effect does this have on
erector spinae & hip flexors?
area of tendinous connective tissue
Anterior iliac crest and
Cartilage of ribs 8-10 and