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)

(Multiaxial) arthrodial/gliding classification

Movements Anteriorly with

protraction Posteriorly with

retraction Superiorly with

elevation Inferiorly with

depression

Joints

Acromioclavicular (AC) 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 GirdleMovements

ElevationElevation

DepressionDepression

AbductionAbductionAdductionAdduction

UpwardUpward

RotationRotation

Downward

DownwardRotation

Rotation

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?