- Muscles of the Shoulder Anterior Deltoid O Anterior lateral 1/3 of the clavicle Middle acromion Posterior spine of the scapula I Deltoid

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Muscles of the Shoulder – Anterior Deltoid
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O: Anterior - lateral 1/3 of the clavicle Middle - acromion Posterior – spine of the scapula I: Deltoid tuberosity of humerus N: axillary A : Anterior – shoulder flexion horizontal adduction, and internal rotation (reach up and touch opposite ear) Middle – shoulder abduction Posterior – shoulder extension, horizontal abduction, and external rotation (opposite of anterior fibers)
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Muscles of the Shoulder – Anterior Deltoid
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P: Anterior R: shoulder horizontal adduction PF: from clavicle to deltoid tuberosity and from the border of the pectoralis major to middle de;toid PB: clavicular head of pectoralis major (medial) and middle deltoid (lateral) Middle R: shoulder abduction PF: tip of the acromion to deltoid tuberosityfrom the border of the anterior to the posterior deltoid PB: anterior and posterior deltoid Posterior R: shoulder horizontal abduction
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PF: from the spine of the scapula to the deltoid tuberosity posterior to the border of the middle deltoid PB: middle deltoid (lateral) and trapezius ( medial and superior), and infraspinatus (inferior) Muscles of the Shoulder – Anterior Deltoid
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C: Anterior, middle and posterior deltoid have different origins, but insert together on deltoid tuberosity of humerus Deltoid is multipennate – each part produces different motions. Anterior deltoid works with clavicular head of pectoralis major Deltoid forms roundness of shoulder Middle deltoid is the only strong shoulder abductor Posterior deltoid is the largest of the sections Full ROM of shoulder joint requires movement at all 4 joints – glenohumeral, acromioclavicular, sternoclavicular, and scapulothoracic
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Muscles of the Shoulder – Anterior Deltoid
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C: The scapulohumeral ratio is 1:2 – 1/3 of motion occurs as scapula and 2/3 occur at the humerus – since normal shoulder flexion is 180°, a patient with no scapula movement would still be able to produce 120° of shoulder flexion – the patient with the more common ailment of of lack of glenohumeral movement could produce 60° of flexion and hyperextend the trunk and appear to produce 90° of shoulder flexion To achieve full shoulder abduction or flexion, full shoulder external rotation is required tomove the tubercle from underneath the acromion. An aklternative which does not require as much Rom is full shoulder internal rotation – then greater tubercle won’t be in the way either The subdeltoid bursae is filled with thin synovial fluid – in some people the fluid becomes too viscous (thick) and forms calcium deposits that dreate pain and inflammation and limit ROM – called bursitis or inflammation of the bursae
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Muscles of the Shoulder – Anterior Coracobrachialis
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O: coracoids process of the scapula I: upper third of the medial border of the humeral shaft N: musculocutaneous A: shoulder flexion and horizontal adduction Palpation R: shoulder horizontal adduction Pp: in the axilla PB: biceps brachii (anterior) and triceps brachii (posterior)
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This note was uploaded on 02/11/2010 for the course AHS 234 taught by Professor Bial during the Fall '09 term at Nassau CC.

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- Muscles of the Shoulder Anterior Deltoid O Anterior lateral 1/3 of the clavicle Middle acromion Posterior spine of the scapula I Deltoid

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