10-20-09 - Shoulder Muscles Weaker vs. Stronger Strong...

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Shoulder Muscles Weaker vs. Stronger
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Strong muscles tend to be tight Stronger o Shoulder extensors o Shoulder adductors o Shoulder internal rotators o Shoulder horizontal adductors
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Elbow
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Classification – diarthrodial; gignlymus; hinge; axial Articulating surfaces – trochlea of humerus with trochlear notch of ulna ; and capitulum of humerus with head of radius Degrees of Freedom of Motion – 1 on sagittal plane Motions – flexion/extension Nerves o Musculocutaneous – biceps brachii and brachialis
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o Radial – triceps and anconeus
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Elbow
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Comment: true hinge joint ** particularly in women , the radius and ulna form a medial obtuse angle with the humerus known as the carrying angle . The carrying angle makes it difficult to measure elbow motion with a goniometer . The goniometer must be held away from the skin
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Elbow Anterior Muscles
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Biceps brachii Brachialis Brachioradialis
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Elbow Posterior Muscles
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Triceps brachii Anconeus
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Biceps brachii
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2 joint muscle – shoulder and elbow Scaption – forearm neutral and in the scapular plane - 30° from abduction towards flexion at 90° shoulder flexion O : o Short head – coracoids process of scapula with the coracobrachialis o Long head – supraglenoid tubercle of scapula I : radial tuberosity N : musculocutaneous
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Biceps brachii
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A: o Shoulder – scaption = flexion and abduction (between) with the forearm neutrally rotated (thumbs up), horizontal adduction o Elbow – flexion o Forearm – supination
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Biceps brachii
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Comment: 2 joint muscle and a mobilizer Superficial muscle Not very strong at either elbow or shoulder – deltoid and pectoralis major clavicular portion are stronger shoulder muscles;
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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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10-20-09 - Shoulder Muscles Weaker vs. Stronger Strong...

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