Anatomy and Kinesiology 420:024 The Shoulder Girdle Anatomy and Kinesiology 420:024

Objectives Bones, bony landmarks and joints Muscles Movements

The Shoulder Girdle The scapula and clavicle Two joints Functions Dynamic stability Increased ROM

Bones From Seeley RR, Stephens TD, Tate P; anatomy and physiology, ed 7, New York, 2006, McGraw-Hill

Bones From Seeley RR, Stephens TD, Tate P; anatomy and physiology, ed 7, New York, 2006, McGraw-Hill

Joints Shoulder girdle (scapulothoracic) Scapula moves on the rib cage Joint motion occurs at sternoclavicular joint & to a lesser amount at the acromioclavicular joint

Joints Sternoclavicular (SC) Anteriorly with protraction (Multiaxial) arthrodial/gliding classification Movements Anteriorly with protraction Posteriorly with retraction Superiorly with elevation Inferiorly with depression

Joints Acromioclavicular (AC) Movements Often injured Arthrodial/gliding classification Movements Some gliding & rotational motion accompanying other shoulder girdle & shoulder joint motions Often injured

Objectives Bones, bony landmarks and joints Muscles Movements

Muscles Five muscles primarily involved in shoulder girdle movements All originate on axial skeleton & insert on scapula and/or clavicle Do not attach to humerus & do not cause shoulder joint actions Functions: Stability ROM of shoulder joint

Shoulder Girdle Muscles Five muscles primarily involved in shoulder girdle movements Trapezius - upper, middle, lower Rhomboid - deep Levator scapula Serratus anterior Pectoralis minor - deep

Trapezius

Levator Scapulae

Rhomboids

Serratus Anterior

Pectoralis Minor

Subclavius

Objectives Bones, bony landmarks and joints Muscles Movements

Movements Focus on specific bony landmarks inferior angle glenoid fossa acromion process Shoulder girdle movements = scapula movements

Movements Elevation Depression

Movements Abduction (protraction) Adduction (retraction)

Movements Upward rotation Downward rotation

Shoulder Girdle Movements Elevation Shoulder Girdle Movements Abduction Adduction Upward Rotation Downward Rotation Depression

Movements Anterior tilt (upward tilt) Posterior tilt (downward tilt)

Movements Lateral tilt (outward tilt) Medial tilt (return from lateral tilt, inward tilt)

Movements Shoulder joint & shoulder girdle work together Shoulder girdle movement independent Upward/downward rotation? Shoulder girdle muscles Stabilize scapula Enhance ROM of shoulder joint

ELEVATION Proximal attachment: Above or below scapula/clavicle? How many muscles fit this criteria?

DEPRESSION Proximal attachment: Above or below scapula/clavicle? How many muscles fit this criteria?

RETRACTION Proximal attachment: In front (ribs) or behind (spine)? How many muscles fit this criteria?

PROTRACTION Proximal attachment: In front (ribs) or behind (spine)? How many muscles fit this criteria?

UPWARD ROTATION Upward or downward torque? How many muscles fit this criteria?

DOWNWARD ROTATION Upward or downward torque? How many muscles fit this criteria?