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Muscle Chart 2

QuestionAnswer
Pectoralis Major Origin:Medial half of clavicle; sternum; costal cartilages of ribs 1-6 Insertion:Lateral lip of intertubercular groove on humerus Action:Flexion, medial rotation, and adduction of the arm
Pectoralis Minor Origin:External surfaces of ribs 3-5 Insertion:Coracoid process of scapula Action:Depression and inferior rotation of scapula
Serratus Anterior Origin:External surfaces of ribs 1-8 Insertion:Medial border of scapula Action: holds scapula against thoracic wal
Latissimus dorsi Origin:Spinous processes of vertebrae T6- T12; thoracolumbar fascia; iliac crest; inferior three ribs Insertion:Intertubercular groove of humerus Action:Extension, adduction, and medial rotation of arm
Trapezius Origin:Posterior surface of occipital bone; ligamentum nuchae; spinous processes of thoracic vertebrae Insertion:Lateral third of clavicle; acromion process; spine of scapula Action:Superior fibers: elevate scapula Middle fibers: retract scapula I
Deltoid Origin:Lateral third of clavicle; acromion process; spine of scapula Insertion:Deltoid tuberosity of humerus Action:Anterior fibers: medial rotation and flexion of arm Middle fibers: abduction of arm Posterior fibers: lateral rotation and extension
Rhomboid minor Origin:ligamentum nuchae; spinous processes of vertebrae C7 and T1 Insertion:Medial border of scapula Action:Elevates scapula;
Teres Major Origin:Scapula, near inferior angle Insertion:Medial lip of intertubercular groove Action:Extension, adduction, and medial rotation of arm
Supraspinatus Origin:Supraspinous fossa of scapula Insertion:Greater tubercle of humerus Action:Abduction of arm
Infraspinatus Origin:Infraspinous fossa of scapula Insertion:Greater tubercle of humerus Action:Lateral rotation of arm
Teres Minor Origin:Lateral border of scapula Insertion:Greater tubercle of humerus Action:Lateral rotation of arm
Subscapularis Origin:Subscapular fossa of scapula Insertion:Lesser tubercle of humerus Action:Adduction and medial rotation of arm
Biceps Brachii Origin:Long Head:superior margin of glenoid fossa of scapula Short Head: coracoid process of scapula Insertion:Radial tuberosity of radius; fascia of medial forearm via bicipital aponeurosis Action:Flexion and supination of forearm; flexion of arm
Brachialis Origin:Anterior surface of humerus Insertion:Coronoid process of ulna Action:Flexion of forearm
Coracobrachialis Origin: Coracoid process of scapula Insertion:Medial surface of humerus Action:Flexion and adduction of arm
Triceps Brachii Origin:Lateral Head: posterior surface of humerus Medial Head: posterior surface of humerus, inferior to origin of lateral head Insertion:Olecranon process of ulna Action:Extension of forearm; long head extends and adducts arm
Pronator Teres Origin:Medial epicondyle of humerus; coronoid process of ulna Insertion:Lateral surface of radius Action:Pronation and flexion of the forearm
Flexor Carpi Radialis Origin:Medial epicondyle of humerus Insertion:Base of metacarpal of the second digit Action:Flexion and abduction of the wrist
Palmaris Longus Origin:Medial epicondyle of humerus Insertion:Flexor retinaculum; palmar aponeurosis Action:Flexion of wrist
Flexor Carpi Ulnaris Origin:Medial epicondyle of humerus; olecranon process of ulna Insertion:Medial carpal bones; metacarpal of fifth digit Action:Flexion and adduction of the wrist
Flexor Pollicis Longus Origin:Anterior surface of radius; Insertion:Distal phalanx of thumb Action:Flexion of the wrist and thumb
Brachioradialis Origin:Lateral supracondylar ridge of humerus Insertion:Lateral surface of distal radius Action:Flexion of forearm
Extensor Carpi Radialis Longus Origin:Lateral supracondylar ridge of humerus:Metacarpal of the second digit Action:Extension and abduction of the wrist
Extensor Carpi Radialis Brevis Origin:Lateral epicondyle of humerus Insertion:Metacarpal of third digit Action:Extension and abduction of the wrist
Extensor Digitorum Origin:Lateral epicondyle of humerus Insertion:Extensor expansions of medial four digits Action:Extension of wrist and fingers
Extensor Carpi Ulnaris Origin:Lateral epicondyle of humerus; posterior surface of ulna Insertion:Metacarpal of the fifth digit Action:Extension and adduction of the wrist
Anconeus Origin:Lateral epicondyle of humerus Insertion:Olecranon process of ulna Action:Very weak extension of the forearm
Supinator Origin:Lateral epicondyle of humerus; proximal ulna Insertion:Posterior, lateral, and anterior surfaces of proximal radius Action:Supination of the forearm
Abductor Pollicis Longus Origin:Posterior surfaces of radius and ulna; interosseous membrane Insertion:Metacarpal of thumb Action:Abducts and extends thumb
Created by: chachi2015
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