|
Movement
|
Occasion
(Situation) |
Muscles
|
|
| Elevation: |
|
 |
Shrugging shoulders
|
- Upper fibres of trapezius
- Levator scapulae
|
| |
|
| Depression: |
 |
Dropping shoulders
(“at ease”). |
- Lower fibres of pectoralis major
- Latissimus dorsi
- Pectoralis minor
|
| |
|
| Protraction: |
 |
- Reaching forwards
- Punching
- Pushing
|
- Serratus anterior
- Pectoralis minor
|
| |
|
| Retraction: |
 |
Drawing back the shoulders
(“atten…tion”) |
- Middle fibres of trapezius
- Rhomboid major
- Rhomboid minor
|
| |
|
| Medial
rotation: |
 |
Assist to draw the
shoulders back. |
- Levator scapulae
- Rhomboid major and minor.
- Weight of the upper limb.
|
| |
|
| Lateral
rotation: |
 |
During shoulder abduction. |
- Upper fibres of trapezius.
- Lower fibres of trapezius.
- Lower part of serratus anterior.
|
| |
The
scapula is able to slide freely over the chest wall because of the loose
connective tissue between serratus anterior and that wall.All the movements
occur around the sternoclavicular joint with minor adjustments at the
acromioclavicular joint.