Origins Insertions And Actions Of Muscles

dellg85's version from 2016-02-16 18:06

Origins Insertions And Actions of Muscles of the Shoulder Girdle


TrapeziusOccipital bone (back of the skull), spinous process of C7 and T1-T12Lateral edge of the clavicle and spine of the scapulaUpper fibres elevate the shoulder girdle and assist in neck extension, middle fibres retract the shoulder girdle, lower fibres depress the shoulder girdle. Muscle as a whole upwardly rotates the scapula.
Levator ScapulaeTransverse processes of C1-C4Medial border of the scapula, between the superior angle and the root of the spine of the scapulaOrigin fixed - elevates scapulae and assists in the downward rotation of the scapula
Insertion fixed - laterally flexes the neck
Rhomboideus MajorSpinous Process of T1-T5Medial border of scapulaRetracts & downwardly rotates the scapula
Rhomboideus MinorSpinous Processes of C7Medial Border of scapulaRetracts and and downwardly rotates scapula
Serratus AnteriorFront of ribs 1-8anterior surface of the medial border of the scapulaprotracts the scapula and upwardly rotates the scapula (with trapezius)
Pectoralis MinorAnterior aspect of ribs 3-5coracoid processes of scapulaOrigin fixed - downward rotation of the scapula
Insertion fixed - elevates ribs during breathing

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