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Deltoid

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Deltoid

(Science: anatomy, muscle) origin, anterior border and upper surface over lateral third of clavicle, lateral border of acromion process, lower border of spine of scapula; insertion, lateral side of shaft of humerus a little above its middle (deltoid tuberosity); action, abduction, flexion, extension, and rotation of arm; nerve supply, axillary from fifth and sixth cervical spinal cord segments through brachial plexus.

Synonym: musculus deltoideus, deltoid.