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Latissimus Dorsi
Orgin: Thoracolumbar Aponeurosis
Lower 6 thoracic spinous processes
Sacrum and iliac crest
Lower 3 to 4 ribs
Inferior angle of scapula
Incertion: Bicipital groove of humerus
Action: Extension
Medial rotation and adduction of humerus
Nerve: Thoracodorsal nerve (Cervical 6, 7, 8)
Palpate: Along posterior - lateral side od rib
cage toword its insertion during
active extension of the humerus
It forms posterior border of axilla
Latissimus means widest and dorsi
means Back (in Latin). It is the widest
muscle of the back. It is powerful
extensor of the flexed humerus in such
activities as swimming or chopping
with an axe. This muscle pulls the
shoulder gridle down and is active
when doing a depression transfer or
when using crutches.
