The Shoulder GirdleChapter 4

Bones

1. Clavicle2. Scapula3. Sternum*

Sternum

Manubrium

Clavicle

Scapula

1. coracoid process,2. acromion process,3. glenoid fossa,4. lateral border,5. inferior angle,6. medial border,7. superior angle,8. spine of the scapula9. subscapular fossa10. supraspinous fossa11. infraspinous fossa

Shoulder Girdle Joints

Sternoclavicular Joint

arthrodial (gliding)

Acromioclavicular Joint

arthrodial (gliding)

Sacpulothoracic Joint

Shoulder Girdle Actions

The clavicle and scapula move as a unit

Most of the movement occurs at the SC joint

Abduction / Adduction

Also called Protraction / Retraction

Transverse plane, Vertical axis

Downward Rotation / Upward Rotation

Frontal plane, Sagittal axis

Depression / Elevation

Frontal plane, Sagittal axis

Summary of Shoulder Girdle Actions

ElevationElevation

DepressionDepression

AbductionAbductionAdductionAdduction

Skull

Abduction / Adduction

Abduction of the AC joint = Horizontal adduction or flexion of the shoulder joint

Adduction of the AC joint = Horizontal abduction or extension of the shoulder joint

Downward Rotation / Upward Rotation

Downard rotation of the AC joint = Adduction of the shoulder joint

Upward rotation of the AC joint = Abduction of the shoulder joint