Iliocostalis Lumborum

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Origin: Lateral and medial sacral crest and medial iliac crests.

Insertion:  Angles of ribs 7-12, medial to insertions of iliocostalis lumborum.

Actions: Bilateral action extends the spine.  Unilateral contraction laterally flexes the vertebral column.

Innervation: Dorsal rami of thoracic spinal nerves

Daily uses: Maintaining straight spine in standing.





Other muscles of the Rotator Cuff


Origin: Supraspinous fossa

Insertion: Greater tuberosity of the humerus

Actions: Abduction 
Stabilisation of the humerus

Innervation: Suprascapular nerve

Daily uses: Holding shopping bags away from the body


Teres Minor

Origin: Mid section of the lateral border of the scapula

Insertion: Greater tuberosity on the humerus

Actions:External rotation, 
Shoulder adduction

Innervation: Axillary nerve

Daily uses: Brushing hair


Origin: Anterior (costal) surface of the scapula

Insertion: Lesser tuberosity of the humerus

Actions: Internal rotation
, Adduction

Innervation: Upper and lower subscapular nerves

Daily uses: Tucking the back of your shirt into your trousers

More Anatomy

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Check out strengthening exercises for the rotator cuff


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