1. EXSC 314 Chapter 4 The Shoulder Girdle PPT Series 4b

2. Muscles of The Shoulder Girdle
Five muscles are primarily involved in shoulder girdle movements:
Trapezius
Rhomboids
Levator Scapulae
Serratus Anterior
Pectoralis Minor
The Subclavius muscle is also located
In the shoulder girdle, but is not a primary
mover.
All muscles originate on the axial skeleton and insert on the scapula and/or the clavicle. These muscles do not attach to the humerus and do not cause shoulder joint actions
These muscles are essential in providing dynamic stability of the scapula so it can serve as a relative base of support for shoulder joint activities such as throwing, batting, and blocking.

3. Muscles of The Shoulder Girdle : Location and Action
Anterior Thorax
Pectoralis minor - Abduction, downward rotation, and depression.
Subclavius - Depression

4. Serratus anterior - Abduction and upward rotation
Posterior and lateral Thorax
Serratus anterior - Abduction and upward rotation

5. Trapezius Rhomboids Posterior Thorax Levator scapulae
Upper fibers - Elevation and extension of the head
Middle fibers - Elevation, adduction, and upper rotation
Lower fibers - Adduction, depression, and upper rotation
Rhomboids
Adduction, downward rotation, and elevation
Levator scapulae
Elevation

6. Muscles of The Shoulder Girdle : Trapezius Muscle

7. Muscles of The Shoulder Girdle : Trapezius Muscle

8. Muscles of The Shoulder Girdle : Trapezius Muscle
Video

9. Muscles of The Shoulder Girdle : Levator Scapulae Muscle

10. Muscles of The Shoulder Girdle : Rhomboid Muscles - Major & Minor

11. Muscles of The Shoulder Girdle : Rhomboid Muscles - Major & Minor
Actions of the Rhomboids: Major and Minor

12. Muscles of The Shoulder Girdle : Serratus Anterior Muscle

13. Muscles of The Shoulder Girdle : Serratus Anterior Muscle
Action of the Serratus Anterior

14. Muscles of The Shoulder Girdle : Pectoralis Minor Muscle
Action Video Next 3:55

15. Muscles of The Shoulder Girdle : Subclavius Muscle
Go to 5:17 in video for Subclavius

16. Muscles of The Shoulder Girdle : Principle Movements
Abduction
Upward Rotation
Pectoralis minor
Serratus anterior
Adduction
Downward Rotation
Middle trapezius
Lower trapezius
Rhomboid
Rhomboid muscles

17. Muscles of The Shoulder Girdle : Principle Movements
Scapular Elevation
Scapular Depression
Levator scapula
Lower trapezius
Upper trapezius
Pectoralis minor
Middle trapezius
Rhomboid
END of PPT SERIES 4B