The Shoulder Girdle Chapter 4

Bones 1. Clavicle 2. Scapula 3. 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 scapula 9. subscapular fossa 10. supraspinous fossa 11. 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

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