Deltoid Muscle Anatomy: Origin, Insertion, Nerve supply and Actions : Dr G Bhanu Prakash

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Deltoid Muscle Anatomy: Origin, Insertion, Nerve supply and Actions

Origin:
_______
Anterior fibers: Lateral third of the clavicle.
Middle fibers: Acromion process of the scapula.
Posterior fibers: Spine of the scapula.

Insertion:
_________
All fibers converge to insert on the deltoid tuberosity on the lateral aspect of the mid-shaft of the humerus.

Function:
_________
Anterior fibers: Shoulder flexion and internal rotation.
Middle fibers: Shoulder abduction (lifts the arm sideways).
Posterior fibers: Shoulder extension and external rotation.

Nerve supply: Axillary

Keep these key points in mind when studying the deltoid muscle for the USMLE - it's more than just the "shoulder muscle", it's an essential component for multiple arm movements and the overall functionality of the upper limb.

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