"kinesiological" View Of The Shoulder And, Upper Arm Muscles.

Front 1

Deltoid Muscle:
1:Anterior Deltoid Muscle.
2: Middle Deltoid Muscle.
3:Posterior Deltoid muscle.

Back 1

*Origin:
:Anterior third of Clavicle.
:Acromion Process.
:Spine of Scapula

*Insertion:
Deltoid Tuberosity of Humerus. All three of them.

*Function:
Anterior: Flexion,abduction(to 90 degrees), and horizontal adduction(after the shoulder and Humerus is zero.90 degrees of Abduction at shoulder joint)
Posterior:Extension, Hyperextension, Abduction( to 90 degrees), and horizontal Abduction (after the shoulder and Humerus is zero.90 degrees of Abduction at shoulder joint)
Middle: Abduction of the shoulder

Front 2

1:Supraspinatus Muscle:

2:Infraspinatus Muscle:

Back 2

Supraspinatus:
*Origin: Supraspinous fossa of Scapula
*Insertion: Greater tubercle of Humerus
*Function: Shoulder abduction

Infraspinatus:
*Origin: Infraspinatus Fossa of Scapula
*Insertion: Greater Tubercle of Humerus
*Function:Lateral rotation, Horizontal Abduction

Front 3

Teres Muscles:
1:Major
2:Minor

Back 3

*Origin (major):Axilary border of scapula near the inferior angle.
Origin (Minor):axillary border of scapula.

*Insertion (Major): Crest elbow, lesser Tubercle
*Insertion (minor): greater tubercle of Humerus

*Function (Major): Adduction, Medial rotation, Extension.
*function (minor): Lateral rotation, Horizontal Abduction.