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Stack #145398
Axioappendicular and Glenohumeral Muscles of Upper Limb
Question | Answer |
---|---|
Pectoralis major: Origin | Anterior surface of medial half of clavicle; anterior surface of sternum, supreior 6 costal cartilages, aponeurosis of external oblique |
Pectoralis major: Insertion | Medial border and superior surface of coracoid process of scapula |
Pectoralis major: Innervation | Lateral and medial pectoral nerves |
Pectoralis major: Main action | Medially rotates and adducts humerus, draws scapula anteriorly and inferiorly |
Pectoralis minor: Origin | Medial border and superior surface of coracoid process of scapula |
Pectoralis minor: Insertion | 3rd to 5th ribs |
Pectoralis minor: Innervation | Medial pectoral nerve |
Pectoralis minor: Main action | Stabilizes scapula, draws inferior and anterior |
Subclavius: Origin | Junction of 1st rib and cartilage |
Subclavius: Insertion | Inferior surface of middle third of clavicle |
Subclavius: Innervation | Nerve to subclavius |
Subclavius: Main action | Anchors and depresses clavicle |
Serratus anterior: Origin | External surfaces of lateral parts of 1st-8th ribs |
Serratus anterior: Insertion | Anterior surface of medial border of scapula |
Serratus anterior: Innervation | Long thoracic nerve |
Serratus anterior: Main action | Protracts scapula and holds it against thoracic wall, rotates scapula |
Trapezius: Origin | Medial third of superior nuchal line, external occipital protuberance, nuchal ligament, SP of C7-T12 |
Trapezius: Insertion | Lateral third of clavicle, acromion and spine of scapula |
Trapezius: Innervation | Spinal accessory nerve (CN XI); C3 and C4 for proprioceptive fibers |
Trapezius: Main action | Elevates, depresses and retracts scapula; act together to rotate glenoid cavity superiorly |
Latissimus dorsi: Origin | SP of T6-T12, thoracolumbar fascia, iliac crest, and inferior 3/4 ribs |
Latissimus dorsi: Insertion | Floor of intertubercular groove of humerus |
Latissimus dorsi: Innervation | Thoracodorsal nerve |
Latissimus dorsi: Main action | Extends, adducts, and medially rotates humerus |
Levator scapulae: Origin | Posterior tubercles of TP of C1-C4 |