Actions, Origins And Insertions Of Shoulder Muscles

Front 1

what are the actions, origins and insertions of the

anterior deltoid

Back 1

actions-abducts and internally rotates the shoulder

origins- originates on the lateral third of the clavicle

insertions- inserts on the deltoid tuberosity on lateral surface of humerous

Front 2

what are the actions, origins and insertions of the

medial deltoid

Back 2

actions- abducts shoulder

origins- originates on the lateral border of accromium process, lateral clavicle

insertions- inserts of the deltoid tuberosity on lateral surface of humerous

Front 3

what are the actions, origins and insertions of the

posterior deltoid

Back 3

actions- abducts and externally rotates shoulder

origins-originates on the inferior border of spine of scapula

insertions- inserts on the deltoid tuberosity on the lateral surface of humerus

Front 4

what are the actions, origins and insertions of the

pectoralis major

Back 4

actions- internal rotation and horizontal adduction of the shoulder (flapping arms)

origins- originates on the medial 2/3 od clavicle, sternum and upper 6 costal cartillages and external oblique aponeuroses

insertions- the lateral lip of bicipital groove of humerus and below greater tubercle