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25 Cards in this Set
- Front
- Back
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Brachialis action
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A major forearm flexor (lifts ulna as biceps lifts the radius)
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Brachialis innervation
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Musculocutaneous nerve
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Anterior origin and insertion
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origin: Origin; insertion: Insertion
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Biceps brachii action
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Flexes elbow joint and supinates forearm; these actions usually occur at same time (e.g., when you open a bottle of wine, it turns the corkscrew and pulls the cord); weak flexor of arm at shoulder
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Biceps brachii innervation
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Musculocutaneous nerve
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Anconeus origin and insertion
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origin: Lateral epicondyle of humerus; insertion: Lateral aspect of olecranon process of ulna
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Anterior action
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Action
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Anterior innervation
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Nerve
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Triceps Brachii origin and insertion
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origin: Infraglenoid tubercle of scapula (long head); Posterior humerus (lateral head), Posterior humerus distal to radial groove (medial head); insertion: By common tendon into olecranon process of ulna
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Anconeus action
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Abducts ulna during forearm pronation; synergist of triceps brachii in elbow extension
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Anconeus innervation
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Radial nerve
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Posterior origin and insertion
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origin: Origin; insertion: Insertion
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Triceps Brachii action
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Powerful forearm extensor (prime mover: particularly medial head); antagonist of forearm flexors; long head tendon may help stabilize shoulder joint and assist in arm adduction
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Triceps Brachii innervation
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Radial nerve
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Coracobrachialis origin and insertion
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origin: Coracoid process of scapula; insertion: Medial surface of humerus shaft
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Posterior action
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Action
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Posterior innervation
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Nerve
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Teres Major origin and insertion
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origin: Posterior surface of scapula at inferior angle; insertion: Crest of lesser tubercle on anterior humerus; insertion tendon fused with that of latissimus dorsi
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Coracobrachialis action
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Flexion and adduction of the humerus; synergist of pectoralis major
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Coracobrachialis innervation
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Musculocutaneous nerve
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Teres Minor origin and insertion
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origin: Lateral border of dorsal scapular surface; insertion: Greater tubercle of humerus inferior to infraspinatus insertion
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Teres Major action
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Extends, medially rotates, and adducts humerus; synergist of latissimus dorsi
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Teres Major innervation
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Lower subscapular nerve
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Infraspinatus origin and insertion
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origin: Infraspinous fossa of scapula; insertion: Greater tubercle of humerus posterior to insertion of supraspinatus
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Teres Minor action
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Helps to hold head of humerus in glenoid cavity; rotates humerus laterally
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