Shoulder - Shoulder Scapula thin flat triangular bone o...

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Shoulder - Scapula: thin, flat, triangular bone o Anterior/costal surface: subscapular fossa o Posterior/ dorsal surface: supraspinous, infraspinous fossa Bony Structures - Spine of the scapula o Projects lateral and superior and becomes acromion process o At the level of T3 - Coracoid Process o Anterior/inferior to the clavicle - Acromion Process o Flattened extension of spine - Suprascapular notch o Medial to coracoid process o U-shaped and shallow o Cannot palpate - Glenoid fossa o Pear shaped and narrow superior o Head of humerus articulates here o Extremely unstable - Glenoid neck o Between glenoid fossa and body of scapula o Can view posteriorly Scapular Borders - Medial (vertebral) - Lateral (axillary) o armpit o Runs at an angle - Superior o Runs laterally with the coracoid process o Suprascapular notch runs on this border Scapular Angles - Inferior o Level of T7 o Can palpate “arm behind back” - Superior o Region of the levator scapulae o Where medial and superior come together - Lateral o Expands to become the glenoid fossa and articulates with the humeral head Supraglenoid tubercle
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Upper border of glenoid and base of coracoid Attachment for long head of biceps Infraglenoid tubercle Upper end of lateral border of scapula below glenoid fossa Attachment for long head of triceps Humerus - Long bone of the upper arm (also known as the brachium) - Tubercles o Greater tuberosity Extends beyond the lateral border of acromion Superior facet – supraspinatus Middle facet – infraspinatus Posterior facet – teres minor o Rotator cuff muscles o Lesser Tuberosity Insertion for the subscapularis muscle o Tubercles are se parated by the intertubercle of bicipital groove Allows for long head of biceps brachii tendon to pass through - Bony Structures o Head of the humerus Articulates with glenoid fossa o Deltoid tuberosity Lateral aspect of humerus Insertion for the deltoid muscle o Radial groove Posterior and inferior to the deltoid tuberosity Accommodates the radial nerve and profunda brachii (deep brachial) artery o Neck of Humerus Anatomical – separates the head from the tubercles Surgical – distal to the tubercles and a junction between the proximal end and the body Common site for fractures Direct contact with axillary nerve Clavicle - Very exposed bone and weak at the curves o Muscle attachment only inferior and posterior o Long and cylinder with a “S” shape - Enlarged sternal end articulates with the manubrium to form the sternoclavicular (SC) joint - Flattened lateral end articulates with the acromion to form the acromioclavicular (AC) joint Subacromial Arch - Formed by the inferior portion of the acromion process
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o Structures within this area include: Long head of the biceps tendon Supraspinatus tendon Subacromial bursa Articulations - Shoulder joint – scapula, clavicle, and humerus - Shoulder girdle – scapula and clavicle - Glenohumeral o Multi-axial ball and socket joint o
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  • Fall '11
  • Stilger
  • Brachial plexus, glenoid fossa

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