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Pectoral girdle notes 2 S shaped clavicles – collarbones 2 broad flat scapulae – shoulder blades Medial, anterior end of clavicle articulates with sternum at the manubrium Only 2 articulations between pectoral girdle and axial skeleton – weak articulation – allows for extreme mobility of shoulders Clavicles – Anterior end articulates with sternum Posterior end articulates with scapula Roughened surface – points of attachment of muscle Scapula Lateral view: cup shaped glenoid fossa(glenoid cavity) – point of articulation with humerus – glenohumeral joint Anterior surface: smooth and concave – “subscapula” Posterior surface – scapular spine – deltoid muscle origin Supraspinous fossa – above the spine of scapula Infraspinous fossa – below spine of scapula Both are marked by lines indicating muscle attachement Acromion- larger posterior superior lateral process – articulates with clavicle(acromoclavicular joint) Coracoid process – (crow’s beak) anterior projection for muscle attachment
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