Muscles of the shoulder

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Author:
mfawcett
ID:
125453
Filename:
Muscles of the shoulder
Updated:
2011-12-31 11:50:10
Tags:
muscle muscles anatomy shoulder
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Description:
Origins, insertions, actions and nerve supply of joints of the shoulder
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  1. Trapezius
    • - Spine/skull
    • --> spine of scapular, acromion, lateral 1/3 of posterior aspect of clavicle
    • - Accessory nerve (motor), C3+4 (sensation)
    • - Shrugging shoulders
  2. Deltoid
    • - Inferior edge of crest of spine of scapular, lateral acromion, anterior lateral 1/3 of clavicle
    • --> deltoid tuberosity of humerus
    • - Axillary nerve
    • - Abducts arm beyond 15*
  3. Levator scapulae
    • - Transverse processes of C1-4
    • --> posterior surface of medial border of scapular
    • - Dorsal scapular nerve, C3+4
    • - Lifts scapula
  4. Rhomboids
    • Minor: C7-T1
    • Major: T2-5
    • --> medial border of scapular
    • - Dorsal scapular nerve
    • - Retracts scapular towards spine
  5. Supraspinatus
    • --> Superior facet of greater tubercle
    • - Suprascapular nerve
    • - Abduction
  6. Infraspinatus
    • --> Middle facet of greater tubercle
    • - Suprascapular nerve
    • - Lateral rotation
  7. Teres minor
    • - Area of scapular next to lateral border below infraglenoid tubercle --> inferior facet of greater tubercle
    • - Axillary nerve
    • - Lateral rotation
  8. Teres major
    • - Oval area on posterior surface of inferior angle of scapular
    • --> bicipital groove
    • - Inferior subscapular nerve
    • - Medial rotation
  9. Pectoralis major
    • - Clavicular head: anterior surface of medial 1/2 of clavicle
    • Sternocostal head: anterior surface of sternum, 7 costal cartilages
    • --> Bicipital groove
    • - Lateral and medial pectoral nerves
    • - Flexion, adduction, medial rotation of shoulder
  10. Pectoralis minor
    • - Anterior surfaces of ribs 3-5
    • --> Coracoid process
    • - Medial pectoral nerve
    • - Pulls tip of shoulder down
  11. Subclavius
    • - 1st rib
    • --> Coracoid process
    • - Nerve to subclavius
    • - Pulls shoulder inferiorly and anteriorly
  12. Serratus anterior
    • - Lateral surface of upper 8-9 ribs
    • --> Medial border of scapula between superior and inferior angles
    • - Long thoracic nerve
    • - Protraction and rotation of scapular
  13. Latissimus dorsi
    • - Spinous processes of T6-12
    • --> Bicipital groove
    • - Thoracodorsal nerve
    • - Adduction
  14. Subscapularis
    • - Medial 2/3 of subscapular fossa
    • --> Lesser tubercle of humerus
    • - Upper and lower subscapular nerves
    • - Medial rotation

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