Common distortions caused by tightness is an internally rotated humerus
MIDDLE DELTOID
Joint Action performed by the Shoulder (glenohumeral)
- Abduction
- Horizontal Abduction
- Flexion
For example it allows the raising of the arm out to the side.
Origin: Scapula – Acromion (lateral)
Insertion: Humerus (lateral – Deltoid tuberosity
POSTERIOR DELTOID
Joint Action performed by the Shoulder (glenohumeral)
- Extension
- Horizontal Abduction
- External Rotation
For example it allows for the arm to be raised to the back
Origin: Scapula – spine (inferior edge)
Insertion: Humerus (lateral) – Deltoid tuberosity
Common distortions caused by tightness (all fibers) is an elevated humerus and the weakening
of the supraspinatus and impingement of the supraspinatus tendon.
ROTATOR CuFF
Infraspinatus
Joint Action performed by the Shoulder (glenohumeral)