Muscles of shoulder


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  • Together, the left and right trapezius muscles form a diamond or trapezoid shape, from which the name is derived.
  • Muscles of shoulder

    2. 2. • Muscles of the pectoral region are divided into anterior and posterior muscles. • Four anterior thoracoappendicular (pectoral) muscles move the pectoral girdle:  Pectoralis major, pectoralis minor, subclavius, and serratus anterior. 10/02/2014 2
    3. 3. MUSCLE ORIGIN Pectoralis major Clavicular head: anterior surface of medial half of clavicle . Sternocostal head: anterior surface of sternum, superior six costal cartilages, and aponeurosis of external oblique muscle 10/02/2014 INSERTION Lateral lip of intertubercular groove of humerus INNERVATION ACTION Lateral and medial pectoral nerves; clavicular head (C5 and C6), sternocostal head (C7, C8, and T1) Adducts and medially rotates humerus; draws scapula anteriorly and inferiorly Acting alone: clavicular head flexes humerus and stemocostal head extends it . 3
    4. 4. Pectoralis major muscle 10/02/2014 4
    5. 5. MUSCLE Pectoralis minor 10/02/2014 ORIGIN 3rd to 5th ribs near their costal cartilages INSERTION INNERVATION Medial border Medial pectoral and superior nerve surface of (C8 and T1) coracoid process of scapula ACTION Stabilizes scapula by drawing it inferiorly and anteriorly against thoracic wall 5
    6. 6. P. minor 10/02/2014 6
    7. 7. MUSCLE Subclavius Serratus anterior 10/02/2014 ORIGIN INSERTION INNERVATION ACTION Junction of 1st rib and its costal cartilage Inferior surface of middle third of clavicle Nerve to subclavius (C5 and C6) Anchors and depresses clavicle External surfaces of lateral parts of 1st to 8th ribs Anterior surface Long thoracic of medial nerve border of (C5, 66, and 07) scapula Protracts scapula and holds it against thoracic wall; rotates 7
    8. 8. Serratus anterior and subclavius 10/02/2014 8
    9. 9. 10/02/2014 9
    11. 11. • The two most superficial muscles of the shoulder are the trapezius and deltoid muscles. • Together, they provide the characteristic contour of the shoulder:  trapezius attaches the scapula and clavicle to the trunk;  deltoid attaches the scapula and clavicle to the humerus. 10/02/2014 11
    12. 12. 10/02/2014 12
    13. 13. • Both trapezius and deltoid are attached to opposing surfaces and margins of the spine of the scapula, acromion, and clavicle. • The scapula, acromion, and clavicle can be palpated between the attachments of trapezius and deltoid. 10/02/2014 13
    14. 14. • Deep to trapezius the scapula is attached to the vertebral column by three muscles-levator scapulae, rhomboid minor and rhomboid major. • These three muscles work with trapezius (and with muscles found anteriorly) to position the scapula on the trunk. 10/02/2014 14
    15. 15. MUSCLE Trapezius 10/02/2014 ORIGIN 1. Superior nuchal line, 2. external occipital protuberance, 3. medial margin of the ligamentum nuchae, 4. spinous processes of CVII to TXII and 5. the related supraspinous ligaments INSERTION 1. Superior edge of the crest of the spine of the scapula, 2. acromion, 3. posterior border of lateral onethird of clavicle INNERVATION ACTION 1. Powerful elevator of the Motor spinal scapula; 2. part of rotates the accessory scapula during nerve (CN XI). abduction of Sensory humerus above (proprioception horizontal; 3. ) anterior rami middle fibers of C3 and C4 retract scapula; 4. lower fibers depress scapula 15
    16. 16. 10/02/2014 16
    17. 17. MUSCLE Deltoid 10/02/2014 ORIGIN INSERTION 1. Inferior edge of the crest of the spine of Deltoid the scapula, 2. tuberosity of lateral margin humerus of the acromion, 3. anterior border of lateral onethird of clavicle INNERVATION Axillary nerve [C5,C6] ACTION Major abductor of arm (abducts arm beyond initial 15° done by supraspinatus); clavicular fibers assist in flexing the arm; posterior fibers assist in extending the arm 17
    18. 18. MUSCLE ORIGIN INSERTION INNERVATION Levator scapulae Transverse processes of CI and CII vertebrae and posterior tubercles of transverse processes of CIII and CIV vertebrae Posterior surface of medial border of scapula from superior angle to root of spine of the scapula Branches Elevates the directly from scapula anterior rami of C3 and C4 spinal nerves and by branches [C5] from the dorsal scapular nerve 10/02/2014 ACTION 18
    19. 19. MUSCLE ORIGIN INSERTION Rhomboi d minor Lower end of ligamentum nuchae and spinous processes of CVII and TI vertebrae Posterior surface of Dorsal medial border scapular Elevates and of scapula at nerve [C4,C5] retracts the the root of scapula the spine of the scapula 10/02/2014 INNERVATION ACTION 19
    20. 20. MUSCLE ORIGIN Rhomboid major Posterior Spinous surface of processes of TII- medial border Dorsal scapular TV vertebrae of scapula from nerve [C4,C5] and intervening the root of the supraspinous spine of the ligaments scapula to the inferior angle 10/02/2014 INSERTION INNERVATION ACTION Elevates and retracts the scapula 20
    22. 22. • The posterior scapular region occupies the posterior aspect of the scapula and is located deep to the trapezius and deltoid muscle. • It contains four muscles, which pass between the scapula and proximal end of the humerus: • the supraspinatus, infraspinatus, teres minor, and teres major muscles. 10/02/2014 22
    23. 23. • The posterior scapular region also contains part of one additional muscle, the long head of the triceps brachii, which passes between the scapula and the proximal end of the forearm. • This muscle, along with other muscles of the region and the humerus, participates in forming a number of spaces through which nerves and vessels enter and leave the region. 10/02/2014 23
    24. 24. • The supraspinatus, infraspinatus, and teres minor muscles are components of the rotator cuff, which stabilizes the glenohumeral joint. 10/02/2014 24
    25. 25. MUSCLE ORIGIN Medial twoSupraspinatus thirds of the supra-spinous fossa of the scapula and the deep fascia that covers the muscle 10/02/2014 INSERTION INNERVATION Most superior facet on the Suprascapular greater tubercle nerve [C5,C6] of the humerus ACTION Rotator cuff muscle; initiation of abduction of arm to 15° at gleno-humeral joint 25
    26. 26. SUPRASPINATUS 10/02/2014 26
    27. 27. MUSCLE Infraspinatus 10/02/2014 ORIGIN INSERTION INNERVATION Medial twothirds of the infra-spinous fossa of the scapula and the deep fascia that covers the muscle Middle facet on Suprascapular posterior nerve [C5,C6] surface of the greater tubercle of the humerus ACTION Rotator cuff muscle; lateral rotation of arm at the glenohumeral joint 27
    28. 28. infraspinatus 10/02/2014 28
    29. 29. MUSCLE Teres minor 10/02/2014 ORIGIN Upper twothirds of a flattened strip of bone on the posterior surface of the scapula immediately adjacent to the lateral border of the scapula INSERTION INNERVATION Inferior facet on the posterior surface of the Axillary nerve greater tubercle [C5,6] of the humerus ACTION Rotator cuff muscle; lateral rotation of arm at the glenohumeral joint 29
    30. 30. 10/02/2014 30
    31. 31. MUSCLE Teres major 10/02/2014 ORIGIN INSERTION INNERVATION Elongate oval area on the posterior surface of the inferior angle of the scapula Medial lip of the intertubercular Inferior sulcus on the subscapular anterior surface nerve [C5 to C7] of the humerus ACTION Medial rotation and extension of the arm at the glenohumeral joint 31
    32. 32. 10/02/2014 32
    33. 33. MUSCLE Long head of triceps brachii 10/02/2014 ORIGIN Infraglenoid tubercle on scapula INSERTION INNERVATION Common tendon of insertion with Radial nerve medial and [C6,C7,C8] lateral heads on the olecranon process of ulna ACTION Extension of the forearm at the elbow joint; accessory adductor and extensor of the arm at the glenohumeral joint 33
    34. 34. 10/02/2014 34
    35. 35. 10/02/2014 35