Download Shoulder Girdle

Shoulder Girdle
KIN 245
Bones of the
Shoulder Girdle
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Scapula (shoulder)
Clavicle (small key)
Link to Axial skeleton via sternoclavicular joint (an
anterior joint)
Lack of posterior attachment to the axial skeleton
allows for a wide ROM
Functions to allow attachment areas for numerous
muscles that move the shoulder and elbow
Landmarks
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Borders
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Angles
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superior, medial, lateral
inferior, superior
Acromion process
Spine of scapula
Glenoid fossa
Coracoid process (like a crow’s beak)
Supraspinatus, Infraspinatus, Subscapular fossa
Joints of the
Shoulder Girdle
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Sternoclavicular
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sternum (manibrum) and clavicle
arthrodial (gliding) joint
ligaments
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anterior sternoclavicular ligament
posterior sternoclavicular ligament
costoclavicular ligament
interclavicular ligament
Joints of the
Shoulder Girdle
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Acromioclavicular
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Acromion Process of scapula and clavicle
arthrodial (gliding) joint
ligaments
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coracoclavicular ligaments
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trapezoid ligament
conoid ligament
superior & inferior acromioclavicular ligaments
Joints of the
Shoulder Girdle
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Scapulothoracic Joint
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Scapula and thoracic region
not really synovial joint
supported by muscles, not ligaments
Movements allowed by
the Shoulder Girdle
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Abduction (Protraction)
Adduction (Retraction)
Inward (downward) rotation: inferior angle
moves medially
Outward (upward) rotation
Depression: inferior movement
Elevation: superior movement
Muscles of the
Shoulder Girdle
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Posterior
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trapezius
levator scapula
rhomboids (major and minor)
Anterior
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pectoralis minor
seratus anterior
subclavius
Trapezius (p134)
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Origin:
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Superior nuchal line
Occipital protuberance
Ligamentum nuchae
C7 and T12 vetebrae
Trapezius
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Insertion
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Lateral 1/3 of clavicle
Acromion process of scapula
Spine of scapula
Trapezius
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Action
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Scapula
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adduction
elevation
depression
outward rotation
Head
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extension / hyperextension
rotation
lateral flexion
Levator Scapulae (p129)
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Origin
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Insertion
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Transverse processes of the 1st four cervical
vertebrae
Vertebral (medial) border of the scapula above
base of scapular spine
Action
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Scapula elevation, inward rotation, adduction
Rhomboid Muscles (p131)
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Origin
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Lower part of ligamentum nuchae
Spinous process of the 7th cervical and 1st five
thoracic vert.
Insertion
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Vertebral border of the scapula
Rhomboid Muscles
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Action
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Scapular
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adduction
inward rotation
elevation
Serratus Anterior (p132)
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Origin
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lateral, anterior surface of the upper 8/9 ribs
Insertion
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Anterior aspect of the vertebral border of the
scapula
Serratus Anterior
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Action
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Scapular
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abduction
outward rotation
depression
Pectoralis Minor (p130)
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Origin
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Insertion
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Anterior surfaces of the 3rd - 5th ribs
Coracoid process of scapula
Action
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Rib elevation
Scapular depression
Subclavius (p133)
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Origin
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Insertion
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Superior aspect of 1st rib (around costal cartilage)
Inferior groove mid-portion of clavicle
Action
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scapular depression
stabilization of sternoclavicular jt.
Summary
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Shoulder Girdle
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bones: clavicle, scapula
joints:
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sternoclavicular
acromioclavicular
scapulothoracic
muscles
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anterior: pectoralis minor, serratus anterior, subclavius
posterior: levator scapulae, rhomboids, trapezius
Shoulder Girdle
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The arm travels through a wide range of
movements, the scapula cooperates by placing
the glenoid fossa in the most favorable position for
the head of the humerus (scapulohumeral rhythm)
Movements of the
Shoulder Girdle
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Clavicle
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elevation, depression
protraction, retraction (or forward and backward horizontal
movements)
Scapula
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elevation, depression
abduction, adduction
inward and outward rotation
Muscle Analysis Chart
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Identify muscles that move the scapula
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abduction
adduction
elevation
depression
upward rotation
downward rotation
Muscles that move the scapula
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abduction
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serratus anterior
pectoralis minor
adduction
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trapezius (middle and lower fibers)
rhomboids
Muscles that move the scapula
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elevation
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trapezius (upper & middle fibers)
levator scapulae
rhomboids (slight)
depression
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trapezius (lower fibers)
pectoralis minor
subclavius (clavicle depression)
Muscles that move the scapula
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outward rotation
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trapezius (middle and lower fibers)
serratus anterior
inward rotation
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rhomboids
Levator scapulae