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Shoulder (Muscle Anatomy (shoulder Region) (Rotator Cuff Rotator Cuff…

- - - - Dorsal surface
      - Inferior angle/lateral border of scapula
    - - Medial lip of intertubercular groves of humerus
    - - Medial rotation of humerus/shoulder
      - Extension
      - adduction
  - - - Anterior fibres
        
        Anterior border and upper surface of clavicle
      - Middle Fibres
        
        Lateral aspect of the acromion process
      - Posterior fibres
        
        Lower lip and posterior border of spine and scapula
    - - Humerus (deltoid tuberosity)
    - - All fibres:
        
        prevents dislocation of humerus when carrying heavy weights
        
        insertion pulls/elevates humerus and humeral head, and clavicle
        
        Abduction
      - Anterior fibres:
        
        Flexation of arm
        
        medial rotation
      - Middle Fibres:
        
        abduction
      - Posterior fibres:
        
        extension
        
        hyperextension of flexed arm
        
        lateral rotation
  - - - origins
        
        Lateral border of the scapula
      - Insertion
        
        lower facet on greater tubercle of humerus
      - Actions
        
        Lateral rotation of humerus/shoulder
    - - origin
        
        infraspinous fossa on scapula
      - Insertions
        
        Middle facet on greater tubercle of humerus
      - Actions
        
        lateral rotation of humerus
    - - insertion
        
        Upper facet on lesser tubercle of humerus
      - actions
        
        medial rotation of humerus
      - Origins
        
        Costal Surface of Scapula
        
        Subscapular Fossa
    - - Origin
        
        Costal surface of scapula
        
        Supraspinous Fossa
      - Insertion
        
        Greater tubercle of humerus
      - Actions
        
        abduction of humerus
- - - - Border closer to midline is known as the medial border
      - Following the Medial Border to the tip is know as the inferior angle
      - Coronoid process
      - Scapulat notch
        
        In living individuals a ligament is attached forming a foramen
      - Sub scapular fossa, lies within the fossa
    - - Spine of the surface is the most notable, broadens laterally to form the acromial process
    - - rare less than 1%
      - Most commonly occur in the body
      - result of direct trauma
      - scapula surrounded/protected by layers of muscles
  - - - assisted by sternoclavicular and aromioclavicular joints
      - are flat almost
    - - Most commonly in the junction of the lateral 1/3 and intermediate 1/3
        
        Weight of the arm pulls scapula downwards
    - - Ridgid strut between sternum and arm
    - - Lower/underside surfaces more roughened due to ligament attachments
      - Lateral end more flattened at acromioclavicular Joint
      - Medial end more rounded for articulation with manubrium of sternum
    - - Medial 2/3 convex anteriorly and lateral 1/3 concave
    - - Feel whole length of bone bellow the skin
    - - Is the last to ossify
      - In week 5/6
    - - Intramembranous ossifications