Etymology:
The word "deltoid" is derived from the Greek word "delta," which means "triangle." The suffix "-oid" means "resembling." Thus, "deltoid" literally means "resembling a triangle."
Meaning:
The deltoid is a muscle located in the shoulder. It is a large, triangular muscle that covers the front of the shoulder joint. The deltoid muscle is responsible for abducting (lifting away from the body) the arm, and for flexing (bending) and rotating the arm.
Origin:
The deltoid muscle originates from the lateral third of the clavicle (collarbone), the acromion process of the scapula (shoulder blade), and the spine of the scapula.
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