shoulder anatomy
DESCRIPTION
Shoulder Anatomy. Shoulder Anatomy - bones. Scapula Clavicle Humerus greater tubercle. Scapula. Supraspinous fossa. Infraspinous fossa. Subscapular fossa. Axillary border. Inferior angle. Humerus. Joints of the shoulder Sternoclavicular (SC) Joint Acromioclavicular (AC) Joint - PowerPoint PPT PresentationTRANSCRIPT
Shoulder AnatomyShoulder Anatomy
Shoulder Anatomy - bonesShoulder Anatomy - bones
• Scapula• Clavicle• Humerus
• greater tubercle
ScapulaScapula
Subscapularfossa
Infraspinous fossa
Inferior angle
Axillaryborder
Supraspinousfossa
Humerus
Shoulder AnatomyShoulder Anatomy
Joints of the shoulder
• Sternoclavicular (SC) Joint
• Acromioclavicular (AC) Joint
• Glenohumeral (GH) Joint
• Scapulothoracic Articulation
Sternoclavicular (SC) JointSternoclavicular (SC) Joint
• Synovial Joint - double gliding joint
• side to side & front to back
• Ligaments• Anterior SC• Posterior SC• Interclavicular• Costoclavicular
SC MovementsSC Movements
• moves in many directions (but only in small amounts)• Protraction• Retraction• Elevation• Depression
SC Joint FunctionSC Joint Function
• Absorbs forces• Distributes forces• Allows movement of
clavicle
Shoulder Anatomy - jointsShoulder Anatomy - joints
• Acromioclavicular
Injury –
“Separated
Shoulder”
Acromioclavicular joint (AC)Acromioclavicular joint (AC)Support a. Capsule - dense but
weak b. Acromioclavicular
ligaments• Superior and
inferior c. Coracoclavicular
ligaments• Trapezoid-
Lateral• Conoid -Medial
AC JointAC Joint
Acromioclavicular JointAcromioclavicular Joint
• A-C Ligament: strengthens A-C joint
along with fibers from
trapezius
• Coracoclavicular Ligament: anchors
Clavicle to coracoid
process; strongest
ligament binding the
clavicle to scapula
Coracoclavicular LigamentCoracoclavicular Ligament
• Two Parts• Conoid ligament
(medial)
• Trapezoid (lateral)
• A-C Separation 1-Stretch A-C
2-Complete tear of A-C; partial
tear of C-C
3-Complete tear of A-C; complete
tear of C-C
Shoulder Anatomy - jointsShoulder Anatomy - joints
• Scapulothoracic• muscular
attachments only• The scapula meets
the rib cage!
Scapulothoracic ArticulationScapulothoracic Articulation
• Movements:• Protraction• Retraction• Elevation• Depression• Upward Rotation• Downward Rotation
Shoulder Anatomy - jointsShoulder Anatomy - joints
• Glenohumeral• ball and socket
• lacks bony stability (small glenoid, large humerus)
• provides motion
• glenoid labrum (fibrocartilage)• rotator cuff (muscular stability)
ROTATOR CUFFROTATOR CUFF
Glenohumeral (GH) JointGlenohumeral (GH) Joint• “True Shoulder Joint”
• Synovial Joint - Ball and Socket
• Glenoid fossa & labrum with Humeral Head
• 3 Major Ligaments:• Coracohumeral - coracoid to greater
tubercle (strong)
• 3 GH bands - thickenings of articular capsule
• Transverse Humeral - greater to lesser tubercle
Glenohumeral Glenohumeral StabilityStability
• Glenoid Cavity
(shallow)
• Glenoid labrum (soft
cartilaginous rim that
adds depth and
stability)
GH Joint SupportGH Joint Support• Capsule • Ligaments
• Anterior – Glenohumeral
• Superior - Coracohumeral
• Coracoacromial arch• Bursae
• Subacromial
• Subdeltoid
• Subscapular bursa
Coracohumeral ligament
Glenohumeral ligaments
Glenohumeral StabilityGlenohumeral Stability
• Anterior Capsule
• Posterior Capsule
• Glenohumeral
ligaments
• Superior
• Middle
• Inferior
GH MovementsGH Movements
• Sacrifices stability for mobility• Flexion• Extension• Abduction• Adduction• Internal Rotation• External Rotation
Upper Arm & Shoulder MusclesUpper Arm & Shoulder Muscles
triceps brachiitriceps brachii
deltoiddeltoid
teres majorteres major teres minorteres minor
brachialisbrachialis
Rotator Cuff MusclesRotator Cuff Muscles
supraspinatussupraspinatus
subscapularissubscapularisinfraspinatusinfraspinatus teres minorteres minor