Iliocostalis Lumborum (Superficial Erector Spinae) anatomy.pdf

Functional Anatomy

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Functional Anatomy

Iliocostalis Lumborum (Superficial Erector Spinae)

Origin

Common origin from the anterior surface

of a broad tendon attached to the medial

crest of the sacrum, spinous processes of

the lumbar and 11th and 12th thoracic

vertebrae, posterior part of the medial lip

of the iliac crest, supraspinous ligament,

and lateral crests of the sacrum

Insertion

Inferior borders of angles of lower 6 or 7

ribs

Actions

Bilaterally, superficial erector spinae

extend the spine; contract strongly when

coughing and straining; when bending

forward, eccentric action of the erector

spinae increases in proportion to the

flexion to decelerate and control

movement to approximately 45o--beyond

that angle, ligamentous tension increases

to unload the spine; as muscles of

respiration, activity at the end of inhalation

and also during exhalation (only at

maximum ventilation rate)

Unilaterally, iliocostalis and longissimus

laterally flex to the same side and rotate to

the opposite side.

In the case of low back pain, superficial

erector spinae show reduced EMG activity

until the test movement becomes painful;

increased motor unit activity during muscle

spasm to "splint" the injured area

Nerve

Lateral branches of the dorsal primary

division of the spinal nerves

0105-TR-XX Iliocostalis Lumborum (Superficial Erector Spinae)

http://www.kinesiotex.com/portal/systems/KinesioWebsite/jsp/functional_enGB_105....

2007-12-21

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