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Origin and insertion of Corachobrachialis
- Origin- Coracoid process of the scapula
- Insertion- Medial surface of the middle shaft of the humerus
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Action, R/N, and D/S of corachobrachialis
- Flexes the shoulder (GH joint)
- Adducts shoulder
- NR
- B (mostly superficial, but deep at the origin)
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Origin and insertion of Pectoralis Major
- Origin- medial half of clavicle, sternum, cartilage of ribs 1 through 6
- Insertion- crest of greater tubercle of humerus
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Actions of all fibers of Pectoralis Major
- Adducts shoulder
- Medially rotates shoulder
- Assists in elevating thorax in forced inspiration (sudden inhalation)
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Actions of the upper fibers of Pectoralis Major
Flexes and horizontally adducts the shoulder
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Action of the lower fibers of Pec Major
Extend
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Origin and insertion of Teres Major
- (Lats' little helper)
- Origin- Inferior angle and lower 1/3 of lateral border of the scapula
- Insertion-Crest of the lesser tubercle of the humerus
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Action, R/N, and D/S of Teres Major
- Extends the shoulder
- Adducts shoulder
- Medially rotates the humerus
- Nonropy
- Superficial
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Latissimus Dorsi is the ____ muscle of the back
broadest muscle of the back
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Origin and insertion of Latissimus Dorsi
- Origin- Inferior angle of scapula, SPs of last 6 lumbar vertebrae, last 3-4 ribs, thoracolumbar aponeurosis, posterior iliac crest
- Insertion- Intertubercular groove of the humerus
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Action, R/N, and D/S of Latissimus Dorsi
- Extends shoulder
- Adducts shoulder
- Medially rotates the humerus
- Nonropy
- Superficial
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Origin and insertion of Deltoid
- Origin- Lateral 1/3 of clavicle, acromion and spine of scapula (fan-shaped origin)
- Insertion- Deltoid tuberosity
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Action of all fibers of the Deltoid
Abduct shoulder joint
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Action of posterior fibers of Deltoid
- Extend and laterally rotate the shoulder joint
- Horizontally abduct GH
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Actions of anterior fibers of Deltoid
- Flex & medially rotate the shoulder joint
- Horizontally adduct GH
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Which muscles adduct the shoulder?
- Corachobrachialis
- Pectoralis major
- Teres major
- Latissimus dorsi
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Which muscle abducts the shoulder joint?
Deltoid
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