Origin: lateral third of clavicle, acromion, and spine of scapula. Action: abduction, flexion and extension, medial and lateral rotation of arm * Deltoid Infraspinatus Supraspinatus Subscapularis

The correct answer is - Deltoid

Explanation:

Deltoid muscles are thick triangular muscles that help in raising and rotating arm covers shoulder joints. It originates lateral third of the clavicle, inferiorly along the spine of the scapula to the acromion.

Deltoid muscles provide actions that include flexion and medial rotation, abduction, and extension, and lateral rotation at the shoulder joint. Deltoid means triangle or that has three sides as it has three originating sides.

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igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

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