1. Shoulder Girdle
KIN 245

2. Bones of the Shoulder Girdle
Scapula (shoulder)
Clavicle (small key)
Link to Axial skeleton via sternoclavicular joint (an anterior joint)
Lack of posterior attachment to the axial skeleton allows for a wide ROM
Functions to allow attachment areas for numerous muscles that move the shoulder and elbow

3. Landmarks Borders Angles Acromion process Spine of scapula
superior, medial, lateral
Angles
inferior, superior
Acromion process
Spine of scapula
Glenoid fossa
Coracoid process (like a crow’s beak)
Supraspinatus, Infraspinatus, Subscapular fossa

4. Joints of the Shoulder Girdle
Sternoclavicular
sternum (manibrum) and clavicle
arthrodial (gliding) joint
ligaments
anterior sternoclavicular ligament
posterior sternoclavicular ligament
costoclavicular ligament
interclavicular ligament

5. Joints of the Shoulder Girdle
Acromioclavicular
Acromion Process of scapula and clavicle
arthrodial (gliding) joint
ligaments
coracoclavicular ligaments
trapezoid ligament
conoid ligament
superior & inferior acromioclavicular ligaments

6. Joints of the Shoulder Girdle
Scapulothoracic Joint
Scapula and thoracic region
not really synovial joint
supported by muscles, not ligaments

7. Movements allowed by the Shoulder Girdle
Abduction (Protraction)
Adduction (Retraction)
Inward (downward) rotation: inferior angle moves medially
Outward (upward) rotation
Depression: inferior movement
Elevation: superior movement

8. Muscles of the Shoulder Girdle
Posterior
trapezius
levator scapula
rhomboids (major and minor)
Anterior
pectoralis minor
seratus anterior
subclavius

9. Trapezius (p134) Origin: Superior nuchal line Occipital protuberance
Ligamentum nuchae
C7 and T12 vetebrae

10. Trapezius Insertion Lateral 1/3 of clavicle
Acromion process of scapula
Spine of scapula

11. Trapezius Action Scapula Head adduction elevation depression
outward rotation
Head
extension / hyperextension
rotation
lateral flexion

12. Levator Scapulae (p129) Origin Insertion Action
Transverse processes of the 1st four cervical vertebrae
Insertion
Vertebral (medial) border of the scapula above base of scapular spine
Action
Scapula elevation, inward rotation, adduction

13. Rhomboid Muscles (p131) Origin Insertion
Lower part of ligamentum nuchae
Spinous process of the 7th cervical and 1st five thoracic vert.
Insertion
Vertebral border of the scapula

14. Rhomboid Muscles
Action
Scapular
adduction
inward rotation
elevation

15. Serratus Anterior (p132) Origin Insertion
lateral, anterior surface of the upper 8/9 ribs
Insertion
Anterior aspect of the vertebral border of the scapula

16. Serratus Anterior Action Scapular abduction outward rotation
depression

17. Pectoralis Minor (p130) Origin Insertion Action
Anterior surfaces of the 3rd - 5th ribs
Insertion
Coracoid process of scapula
Action
Rib elevation
Scapular depression

18. Subclavius (p133) Origin Insertion Action
Superior aspect of 1st rib (around costal cartilage)
Insertion
Inferior groove mid-portion of clavicle
Action
scapular depression
stabilization of sternoclavicular jt.

19. Summary Shoulder Girdle bones: clavicle, scapula joints: muscles
sternoclavicular
acromioclavicular
scapulothoracic
muscles
anterior: pectoralis minor, serratus anterior, subclavius
posterior: levator scapulae, rhomboids, trapezius

20. Shoulder Girdle
The arm travels through a wide range of movements, the scapula cooperates by placing the glenoid fossa in the most favorable position for the head of the humerus (scapulohumeral rhythm)

21. Movements of the Shoulder Girdle
Clavicle
elevation, depression
protraction, retraction (or forward and backward horizontal movements)
Scapula
abduction, adduction
inward and outward rotation

22. Muscle Analysis Chart Identify muscles that move the scapula abduction
adduction
elevation
depression
upward rotation
downward rotation

23. Muscles that move the scapula
abduction
serratus anterior
pectoralis minor
adduction
trapezius (middle and lower fibers)
rhomboids

24. Muscles that move the scapula
elevation
trapezius (upper & middle fibers)
levator scapulae
rhomboids (slight)
depression
trapezius (lower fibers)
pectoralis minor
subclavius (clavicle depression)

25. Muscles that move the scapula
outward rotation
trapezius (middle and lower fibers)
serratus anterior
inward rotation
rhomboids
Levator scapulae