Slide 1Slide 2Slide 3Slide 4Slide 5Slide 6Slide 7Slide 8Slide 9Slide 10Slide 11Slide 12Slide 13Slide 14Slide 15Slide 16Slide 17Slide 18Slide 19Slide 20Slide 21Slide 22Slide 23Slide 24Slide 25Slide 26Slide 27Slide 28Slide 29Slide 30Slide 31Slide 32Slide 33Shoulder MusclesChapter 5Determination of Muscle Action1.Muscle location?Origin and insertion2.What joint(s) it crosses or act on?Where does the muscle cross the joint? (e.g. anterior, lateral, etc.)3.What are the possible planes of movement and actions at that joint? (also see pages 23, 24)4.What is the line of pull?1. Muscles only pull on bones, they do not push bones.Insertion is usually pulled towards the origin. Remember, most muscle can not perform opposite actions (e.g. flexion AND extension).Anterior Muscles•Coracobrachialis•Pectoralis major•SubscapularisCoracobrachialis•Origin: coracoid process•Insertion: medial humerus•Actions:•Horizontal Adduction of the shoulder •flexion of the shoulder•adduction of the shoulderPectoralis Major•Origin:•Proximal clavical (clavicular head)•Sternum (sternal head)•Insertion: Intertubercular groove•Actions:•Clavicular (upper)•Internal rotation•Horizontal adduction•Flexion up to 60º•Adduction beyond 90º•Abduction below 90º•Sternal (lower)•Internal rotation•Horizontal adduction•Extension to a neutral position•Adduction•Pectoralis MajorSubscapularis•Origin: subscapular fossa•Insertion: lesser tubercle•Actions:•Internal rotation•Adduction•Extension•Other: anterior rotator cuff muscleNote: Anterior view. The ribs are removed from this image•Deltoid•SupraspinatusSuperior MusclesDeltoid•Origin:•Anterior: distal clavicle•Middle: acromion process•Posterior: spine of scapula•Insertion: •Actions•Anterior: abduction, flexion, internal rotation, horizontal adduction•Middle: abduction•Posterior: abduction, extension, external rotation, horizontal abduction•DeltoidLateral view•Origin: supraspinatus fossa•Insertion: greater tubercle•Action: abduction•Other: rotator cuff muscleSupraspinatusInferior Muscles•Latissimus dorsi•Teres major•Origin:•Insertion: intertubercular groove•Actions:•adduction•internal rotation•extension•horizontal abduction•“swimmer’s muscle”Latissimus Dorsi•Origin: inferior angle•Insertion: intertubercular groove•Actions: •adduction•internal rotation•extensionTeres Major“lats little helper”•Infraspinatus•Teres minorPosterior MusclesInfraspinatus•Origin: infraspinus fossa•Insertion: greater tubercle•Actions:•extension•external rotation•horizontal abduction•Other: rotator cuff muscle•Origin: lateral border•Insertion: greater tubercle•Actions: •extension•external rotation•horizontal abduction•Other: rotator cuffTeres MinorS.I.T.SRotator Cuff Muscles•Name the horizontal adduction muscles•pectoralis major (upper and lower fibers)•corachobrachialis•anterior deltoid•Name the horizontal abduction muscles•posterior deltoid•infraspinatus•teres minor•latissimus dorsi•Name the flexor muscles•coracobrachialis•pect major (upper fibers)•anterior deltoid•Name the extensor muscles•latissimus dorsi•teres major•posterior deltoid•pectoralis major (lower fibers)•Name the adductor muscles•pect major (upper and lower fibers)•coracobrachialis•latissimus dorsi•teres major•Name the abductor muscles•deltoid (all fibers)•supraspinatus•Name the internal rotator muscles•subscapularis•latissimus dorsi•teres major•anterior
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