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32 Cards in this Set
- Front
- Back
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What are the movements possible at the scapulothoracic joint?
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Flexion
Extension Abduction Adduction Internal rotation External rotation |
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Name the principle muscles responsible for movement of the arm at the glenohumeral joint.
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Muscles of the rotator cuff (x4)
Deltoid Pectoralis major Latissimus dorsi |
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Name the four muscles of the rotator cuff.
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SITS
Supraspinatous Infraspinatous Teres minor Subscapularis |
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Where is the origin of the subscapularis?
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Anterior aspect of scapula
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Where is the insertion of the subscapularis?
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Lesser tubercle of humerus
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What is the main action of the subscapularis?
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Internal rotation of arm at the glenohumeral joint
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Where is the origin of the supraspinatous?
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Posterior aspect of the scapula, above the scapular spine
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Where is the insertion of the supraspinatous?
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Greater tubercle of humerus
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Where must the tendon of the supraspinatous pass before inserting on the greater tubercle?
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Underneath the acriomioclavicular joint
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What is the principle action of the supraspinatous?
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Weak adductor of the arm at the glenohumeral joint
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What is the principle action of the infraspinatous muscle?
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External rotation of the arm
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What is the principle action of the teres minor muscle?
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External rotation of the arm
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How can the muscle fibers of the deltoid be organized?
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Three groups: anterior, middle, and posterior
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Where do ALL the fibers of the deltoid insert?
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Lateral aspect of humerus
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Where do the anterior fibers of the deltoid originate?
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Clavicle
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Where do the middle fibers of the deltoid originate?
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Acromion
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Where do the posterior fibers of the deltoid originate?
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Spine of scapula
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What is the principle action of the anterior deltoid group?
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Flexion of the arm at the glenohumeral joint
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What is the principle action of the middle deltoid group?
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Abduction of the arm at the glenohumeral joint
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What is the principle action of the posterior deltoid group?
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Extension of the arm at the glenohumeral joint
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Where is the origin of the pectoralis major muscle?
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The pectoralis major has two heads: a clavicular head and a sternocostal head (sternum and costal cartilages)
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Where does the pectoralis major muscle insert?
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Lateral bicipital groove of humerus
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What is the principle action of the pectoralis major muscle?
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Adduction and medial rotation of the arm at the glenohumeral joint
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Where is the origin of the latissimus dorsi?
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Lower back and pelvis
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Where is the insertion of the latissimus dorsi?
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Medial bicipital groove of humerus
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What is the primary action of the latissimus dorsi?
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Extension and adduction of arm at glenohumeral joint
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Name two muscles responsible for each of the following movements:
Flexion of the arm at the glenohumeral joint. |
Anterior deltoid group, pectoralis major
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Extension of the arm at the glenohumeral joint.
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Posterior deltoid group, latissimus dorsi
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Abduction of the arm at the glenohumeral joint
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Supraspinatous
Middle deltoid group |
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Adduction of the arm at the glenohumeral joint
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Pectoralis major
Latissimus dorsi |
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Medial (internal) rotation of the arm
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Subscapularis
Pectoralis major |
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Lateral (external) rotation of the arm
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Infraspinatous
Teres minor |
