Skip to Content

deltoid (muscle)


Definition: intrinsic (scapulohumeral) muscle of shoulder joint; origin, lateral third of anterior border of clavicle, lateral and posterior border of acromion process, lower border of spine of scapula; insertion, lateral side of shaft of humerus (deltoid tuberosity) a little above its middle; action, its anterior, middle, and posterior portions act independently to produce abduction, flexion, extension, and rotation of the humerus at the shoulder joint; nerve supply, axillary (fifth and sixth cervical spinal cord segments via the brachial plexus).

Synonym(s): musculus deltoideusTA

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.