Download The Shoulder Girdle

The Shoulder Girdle
Anatomy and Physiology of
Human Movement
420:050
Objectives



Bones, bony landmarks and joints
Muscles
Movements
The Shoulder Girdle



The scapula and clavicle
Two joints
Functions


Dynamic stability
Increased ROM
From Seeley RR, Stephens TD, Tate P; anatomy and
physiology, ed 7, New York, 2006, McGraw-Hill
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



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Anteriorly with
protraction
Posteriorly with
retraction
Superiorly with
elevation
Inferiorly with
depression
Joints

Acromioclavicular (AC)


Movements


Arthrodial/gliding
classification
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


upward or superior
movement, as in shrugging
shoulders
Depression

downward or inferior
movement, as in returning to
normal position
Movements

Abduction (protraction)


scapula moves laterally
away from spinal column
Adduction (retraction)

scapula moves medially
toward spinal column
Movements

Upward rotation


turning glenoid fossa upward
& moving inferior angle
superolaterally away from
spinal column
Downward rotation

returning inferior angle
inferomedially toward spinal
column & glenoid fossa to
normal position
Elevation
Shoulder
Girdle
Movements
Abduction
Adduction
Depression
Movements

Anterior tilt (upward tilt)



Rotational movement of scapula about frontal axis
Occurs during glenohumeral hyperextension
Posterior tilt (downward tilt)


Rotational movement of scapula about frontal axis
Occurs during glenohumeral hyperflexion
Movements

Lateral tilt (outward tilt)


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Rotational movement about its vertical axis
Occurs during protraction
Medial tilt (return from lateral tilt, inward tilt)


Rotational movement about its vertical axis
Occurs during retraction
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?




Upper fibers trapezius
Middle fibers trapezius
Rhomboids
Levator Scapulae
DEPRESSION


Proximal attachment:
Above or below
scapula/clavicle?
How many muscles fit
this criteria?



Lower fibers trapezius
Pectoralis minor
Subclavius
RETRACTION


Proximal attachment: In
front (ribs) or behind
(spine)?
How many muscles fit
this criteria?



Trapezius (all fibers)
Rhomboids
Levator scapulae
PROTRACTION


Proximal attachment: In
front (ribs) or behind
(spine)?
How many muscles fit
this criteria?


Serratus anterior
Pectoralis minor
UPWARD ROTATION


Upward or downward
torque?
How many muscles fit
this criteria?


Trapezius (all fibers)
Serratus anterior
DOWNWARD ROTATION


Upward or downward
torque?
How many muscles fit
this criteria?


Pectoralis minor
Rhomboids