On both sides, the deltoid muscles are important in attaching the shoulder girdle to the arm. In continuity, they originate from the:
They insert into the deltoid tuberosity. Acting as a unit, deltoid acts to abduct the arm at the glenohumeral joint. However, the anterior fibres assist in flexing and medially rotating the arm whereas the posterior fibres extend and laterally rotate.
Deltoid is innervated by the axillary nerve (C5, C6).
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