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Exam 6 A&P
Origin-Insertion-Action-Innervation of Shoulder
| Question | Answer |
|---|---|
| Origin of Pectoralis major | Medial half of the clavicle (clavicular head); anterior surface of the sternum, 1st to 6th costal cartilages, aponeurosis of external oblique muscle (sternocosotal head) |
| Insertion of Pectoralis major | Crest of greater tubercle of humerus |
| Action of Pectoralis major | Adduction and medial rotation of the humerus; Assist to elevate thorax during forced inhalation (arm fixed) Upper fibers: flex and horizontally adduct(G/H joint). Lower fibers extend (G/H joint) |
| Innervation of Pectoralis major | Lower fibers: Lateral and medial pectoral nerves (C6, 7, 8 , T1) Upper fibers: Lateral Pectoral Nerves (C5, 6, 7) |
| Origin of Pectoralis minor | Anterior surface of the 3rd, 4th, and 5th ribs and the fascia overlying the intercostal spaces |
| Insertion of Pectoralis minor | Medial border and superior surface of the coracoid process of the scapula |
| Action of Pectoralis minor | Protraction of the scapula, pulls the coracoid process anteriorly and inferiorly, accessory muscle in respiratory |
| Innervation of Pectoralis minor | Medial pectoral nerve |
| Origin of Deltoid | Lateral third of the clavicle, acromion, and spine of scapula Mnemonic: 'Deltoid helps you carry SACS' |
| Insertion of Deltoid | Deltoid tuberosity of the humerus |
| Action of Deltoid | Abduction and stabilization of the glenohumeral joint |
| Innervation of Deltoid | Axillary nerve (C5, 6) |
| Origin of Coracobrachialis | Coracoid process of the scapula |
| Insertion of Coracobrachialis | Medial surface of mid-humeral shaft |
| Action of Coracobrachialis | Adduction and flexion shoulder at glenohumeral joint |
| Innervation of Coracobrachialis | Musculocutaneous nerve (C6, 7) |
| Origin of Latissimus dorsi | Inferior angle of scapula, spinous process of last 6 thoracic Vertebrae, last 3 or four ribs thoracolumbar aponeurosis and posterior iliac crest |
| Insertion of Latissimus dorsi | Intertubercular groove of the humerus |
| Action of Latissimus dorsi | Extend, adduct and medial rotate shoulder at glenohumeral joint |
| Innervation of Latissimus dorsi | Thoracodorsal nerve (C6-C8) |
| Action of Anterior deltoid fibers | Flex, medial rotate, horizontally abduct shoulder at glenohumeral joint |
| Action of Posterior deltoid fibers | Extend, laterally rotate, and horizontally abduct shoulder at glenohumeral joint |
| Origin of subclavius | Costal cartilage, sternal end of rib 1 |
| Insertion of subclavius | Anteroinferior surface of middle third of clavicle |
| Action of subclavius | Stabilize Sternoclavicular joint: Anchors and depresses clavicle, elevate 1st rib to assist with inhalation, |
| Innervation of subclavius | Subclavian nerve (C5-C6) |
Created by:
JML19
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