16. + Vertebral Movement
Greatest mobility
one curve ends then next begins
Exaggerated curve (vs flat & rigid)
increased mobility
flat back – loss of lumbar lordosis
Cervical & lumbar
most mobile
18. Layers of the Intrinsic Back Muscles
Superficial Layer
Both Splenius muscles
Intermediate Layer
Erector Spinae (bilateral and
ipsilateral action)
Designated by region from
medial to lateral
Designated by insertion
Deep Layer
Interconnect and stabilize the
vertebra
Small muscles that make fine
adjustments to vertebra
19
29. +
Divisions of the sacrospinalis (aka
Erector spinae)
30
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.
30. Erector Spinae
(sacrospinalis) Origin
Sacrum, spinous processes of
lower two thoracic & all
lumbar
Insertion
Transverse and spinous
processes as well as ribs and
skull
Location: Posterior
Movements (spine)
Extension (C & L)
Ipsilateral flexion
(C & L)
Iliocostalis Longissimus Spinalis
31. +
Erector Spinae
Muscle is thickest in S & L regions
most movement
Controls forward flexion
Extension of trunk
Posterior stability
posture
33. Rectus Abdominis
Controls
Post pelvic tilt & curvature LS
Flattens lower back
What effect does this have on
erector spinae & hip flexors?
more effective
Definition
3 depressions
area of tendinous connective tissue
35. Internal Oblique
Origin
Anterior iliac crest and
inguinal ligament
Insertion
Cartilage of ribs 8-10 and
linea alba
Location:
anterior/medial
Movements
Flexion
Ipsilateral flexion
Fiber direction
37. +
What functions do the anterior trunk
muscles play?
In what order from superficial to deep are these layers?
Functions:
Flexion (forward and lateral)
Rotation
38