1 The Shoulder Girdle click here Main Menu K.2 http://www.handsonlineeducation.com/classes//k2entry.htm[3/23/18, 1:07:11 PM]
Bones Scapula and Clavicle Move as a unit Clavicle s articulation with sternum is only bony link to axial skeleton Boney Landmarks Manubrium Clavicle Coracoid process Acromion process Glenoid fossa Lateral border Inferior angle Medial border Acromion process Glenoid fossa Lateral border Inferior angle Medial border Superior angle Spine of the scapula http://www.handsonlineeducation.com/classes//k2pg1.htm[3/23/18, 1:07:28 PM]
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Joints Shoulder girdle (scapulothoracic) Sternoclavicular (SC) scapula moves on the rib cage joint motion occurs at sternoclavicular joint & to a lesser amount at the acromioclavicular joint (multiaxial) arthrodial classification Sternoclavicular (SC) Ligamentous support arthrodial classification supported by Acromioclavicular (AC) Coracoclavicular ligaments Superior acromioclavicular ligament Inferior acromioclavicular ligament often injured Scapulothoracic not a true synovial joint does not have regular synovial features movement depends on SC & AC joints which allows the scapula to move supported dynamically by its muscles no ligamentous support http://www.handsonlineeducation.com/classes//k2pg4.htm[3/23/18, 1:09:23 PM]
Shoulder Girdle Movements = Scapula Movements http://www.handsonlineeducation.com/classes//k2pg5.htm[3/23/18, 1:09:36 PM]
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Muscles Five muscles primarily involved in movement of Shoulder Girdle Trapezius - upper, middle, lower Rhomboid - deep Levator scapula Serratus anterior Pectoralis minor - deep http://www.handsonlineeducation.com/classes//k2pg13.htm[3/23/18, 1:11:47 PM]
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Trapezius Muscle Upper fibers: elevation of scapula, extension and rotation of head Middle fibers: elevation, upward rotation and adduction Lower fibers: depression, adduction and upward rotation http://www.handsonlineeducation.com/classes//k2pg15.htm[3/23/18, 1:12:12 PM]
Levator Scapulae Muscle Elevates the medial margin of the scapula http://www.handsonlineeducation.com/classes//k2pg16.htm[3/23/18, 1:12:24 PM]
Rhomboid Muscle: Major and Minor Rhomboid major and minor muscles work together Adduction (retraction): draw scapula toward spinal column Downward rotation: from upward rotated position they draw scapula in downward rotation Elevation: slight upward movement accompanying adduction http://www.handsonlineeducation.com/classes//k2pg17.htm[3/23/18, 1:12:46 PM]
Serratus Anterior Muscle Abduction (protraction): draws medial border of scapula away from vertebrae Upward rotation: longer, lower fibers tend to draw inferior angle of scapula farther away from vertebrae, thus rotating scapula upward slightly http://www.handsonlineeducation.com/classes//k2pg18.htm[3/23/18, 1:13:13 PM]
Pectoralis Minor Muscle Abduction (protraction): draws scapula forward & tends to tilt lower border away from ribs Downward rotation: as it abducts, it draws scapula downward Depression: when scapula is rotated upward, it assists in depression http://www.handsonlineeducation.com/classes//k2pg19.htm[3/23/18, 1:13:26 PM]
Subclavius Muscle Stabilization and protection of sternoclavicular joint Depression Abduction http://www.handsonlineeducation.com/classes//k2pg20.htm[3/23/18, 1:13:39 PM]
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