Download KH 2220 Laura Abbott, MS, LMT

KH 2220
Laura Abbott,
MS, LMT
Day 8
Muscles of the Spine:
Spinalis, Longissimus,Iliocostalis, Multifidus,
Rotatores
Erector Spinae - Spinalis
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This is the narrow medial
column of the erector
spinae muscle and is
relatively insignificant.
It arises from the common
origin and extends from the
spinous processes in the
superior lumbar and inferior
thoracic regions to the
spinous processes in the
superior thoracic region.
It may also be divided into
three parts (spinalis thoracis,
spinalis cervicis, and spinalis
capitis).
Erector Spinae - Longissimus
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This is the intermediate
column of the erector
spinae muscle and it arises
from the common origin
and is attached to the
transverse processes of the
thoracic and cervical
vertebrae, and the mastoid
process of the temporal
bone of the skull.
This gives this muscle a
herringbone appearance.
The longissimus can also be
divided into three parts
according to the regions it
traverses.

Longissimus thoracis inserts
into the tips of the
transverse processes of all
of the thoracic vertebrae,
and into the tubercles of
the inferior nine to ten ribs;
longissimus cervicis
extends from the superior
thoracic transverse
processes to the cervical
transverse processes; the
longissimus capitis arises in
common with the cervical
part and attaches to the
mastoid process of the
temporal bone.
 Longissimus
Erector Spinae - Iliocostalis
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This is the lateral column of
the erector spinae and it
arises from the common
origin and inserts into the
angles of the ribs.
It may be divided into three
parts according to the
region involved.
Iliocostalis lumborum is
attached to the inferior six
ribs; iliocostalis thoracis is
attached to all the ribs; and
iliocostalis cervicis is
attached to the superior six
ribs and the posterior
tubercles of C4 to C6
vertebrae.
I
 Like
 Spaghetti
 Iliocostalis
 Longissimus
 Spinalis
Actions of the Erector Spinae
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Acting bilaterally, all three columns of the erector
spinae extend the head and part or all of the
vertebral column.
Acting unilaterally, the erector spinae laterally
flexes the head or the vertebral column.
In addition, the longissimus capitis muscle rotates
the head so that it is turned to the same side.
The erector spinae muscles are the chief controller
of flexors of the vertebral column.
They straighten the flexed column and can bend it
posteriorly. They also "pay out" (release) during its
flexion so that the movement is slow and
controlled.
Multifidus
 O:
Transverse process
of one vertebrae
 I: spinous process of all
vertebrae extending
from 2-4 vertebrae
higher
 A: bilaterally extends
vertebral column;
unilaterally rotate
vertebral bodies
(column) to opposite
side and lateral flexion
to same side
Rotatores
 O:
transverse
process of one
vertebra
 I: spinous process of
vertebra 1-2 above
 A: rotate to
opposite side;
bilateral extension