Anatomy
Shoulder Anatomy
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Shoulder Anatomy
, Shoulder
See Also
Shoulder History
Shoulder Exam
Shoulder Pain
Arm Anatomy
Musculoskeletal Anatomy
Clavicle
Humerus
Scapula
Anatomy
Bone and Ligament
Also available as a
Poster size image
. See
printing instructions and image restrictions.
Also available as a
Poster size image
. See
printing instructions and image restrictions.
Lewis (1918) Gray's Anatomy 20th ed
(in
public domain
at
Yahoo
or
BartleBy
)
Lewis (1918) Gray's Anatomy 20th ed
(in
public domain
at
Yahoo
or
BartleBy
)
Lewis (1918) Gray's Anatomy 20th ed
(in
public domain
at
Yahoo
or
BartleBy
)
Muscles
Lewis (1918) Gray's Anatomy 20th ed
(in
public domain
at
Yahoo
or
BartleBy
)
Lewis (1918) Gray's Anatomy 20th ed
(in
public domain
at
Yahoo
or
BartleBy
)
Lewis (1918) Gray's Anatomy 20th ed
(in
public domain
at
Yahoo
or
BartleBy
)
Anatomy
Bones
Scapula
Scapula
r spine
Third thoracic
Vertebra
e
Scapula
r inferior angle
Eighth thoracic
Vertebra
e (7th rib)
Clavicle
Humerus
Anatomy
Muscles
Muscles attaching Axial skeleton to
Scapula
Trapezius
Levator
Scapula
e
Rhomboids
Serratus anterior
Muscles attaching Axial skeleton to
Humerus
Latissimus dorsi
Pectoralis major
Anatomy
Joints and Articulations
Glenohumeral joint (GH Joint)
Glenoid of
Scapula
meets humeral head
Golf ball on golf tee
Articulation with bone: 30%
Articulation with glenoid labrum: 75%
Posterior
Chest
Wall (Scapulothoracic articulation)
Acromioclavicular Joint (AC Joint)
Acromion of
Scapula
meets the clavicle
Sternoclavicular Joint (SC Joint)
Anatomy
Nerves
Rotator cuff is innervated by
Brachial Plexus
derived nerves
Suprascapular nerve
Innervates supraspinatus and infraspinatus
Axillary nerve
Wraps around the
Humerus
surgical neck
Innervates teres minor
Also innervates the deltoid muscle (not part of the rotator cuff)
Subscapular nerve
Innervates subscapularis
Anatomy
Subacromial Space
Coracoclavicular arch forms the roof of the subacromial space
Coracoid process
Coracoacromial ligament
Acromion process
Rotator cuff composition (mnemonic: SITS Muscles)
Anterior Rotator Cuff
Subscapularis Muscle
Posterior Rotator Cuff
Infraspinatus Muscle
Teres Minor Muscle
Superior Rotator Cuff
Supraspinatus Muscle
Subacromial bursae
Separates cuff from overlying coracoacromial arch
Includes subdeltoid bursa and subcoracoid bursa
Image
Physiology
Function
Scapula
stabilized prior to arm movement
Rotator Cuff (Musculotendinous)
Steadies humeral head in glenoid
Results in humeral head descent
Scapulothoracic Musculature
Results in forward and lateral
Scapula
movement
Initiates first 60-70 degrees of
Shoulder Abduction
Glenohumeral Musculature
Deltoid and supraspinatus muscles
Accounts for last two thirds of
Shoulder Abduction
Physiology
Muscle action at Glenohumeral joint
Shoulder Abduction
Middle deltoid muscle
Supraspinatus muscle
Shoulder Adduction
Pectoralis major muscle
Latissimus dorsi muscle
Shoulder Flexion
Anterior deltoid muscle
Coracobrachialis muscle
Shoulder Extension
Posterior deltoid muscle
Latissimus dorsi muscle
Teres major muscle
Shoulder Internal Rotation
Pectoralis major muscle
Latissimus dorsi muscle
Teres major muscle
Subscapularis muscle
Shoulder External Rotation
Infraspinatus muscle
Teres Minor muscle
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