Lecture 10 Outline of Last Lecture I. Bones II. Joints III. SC Ligaments IV. AC Ligaments V. Brachial Plexus VI. Movements VII. Movements and Muscles VIII. Shoulder Girdle Muscles !IX. Trapezius Outline of Current Lecture I. Levator Scapulae II. Rhomboids III. Serratus Anterior IV. Pectoralis Minor V. Subclavius VI. Bones VII. Skeletal Structures (Posterior) VIII. Skeletal Structures (Anterior) IX. Glenohumeral Joint X. Glenohumeral Joint Movements XI. Glenoid Labrum HPER 205 1st Edition These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best !used as a supplement to your own notes, not as a substitute. !XII. Shoulder Bursae XIII. Glenohumeral Joint Ligaments XIV. Rotator Cuff XV. Muscles Current Lecture Shoulder Girdle continued… J. Levator Scapulae 1. Action a. Elevation b. Retraction c. Downward rotation 2. Origin - vertebrae 3. Insertion - medial border of scapula above spine K. Rhomboids 1. Actions a. Retraction b. Downward rotation c. Elevation 2. Origin - vertebrae 3. Insertion - medial border of scapula below spine 4. Actions during stabilization: a. fix scapula in retraction during shoulder extension and adduction b. used in pull ups and dips L. Serratus Anterior1. Actions a. Protraction b. Upward rotation 2. Origin - ribs 3. Insertion - medial border pf scapula 4. Actions during stabilization: a. draw scapula forward against thorax b. punching c. overhand throwing d. push ups M. Pectoralis Minor 1. Actions a. Depression b. Protraction c. Downward rotation 2. Origin - ribs 3. Insertion - coracoid process 4. Actions during stabilization: a. work with serrates anterior in protraction of scapula b. pushing movement with hands c. dips N. Subclavius 1. Stabilizes and protects sternoclavicular joint 2. Actions a. Depression3. Origin - rib 4. Insertion - clavicle Glenohumeral Joint A. Bones 1. Scapula a. glenoid fossa or cavity 2. Humerus a. head of humerus 3. Clavicle attaches joint to axial, but NOT part of joint B. Skeletal Structures (Posterior) 1. Spine of scapula 2. Acromion process 3. Fossae 4. Angles 5. Borders 6. Glenoid fossa 7. Head of humerus C. Skeletal Structures (Anterior) 1. Coracoid process 2. Subscapular fossa 3. Greater tubercle 4. Lesser tubercle 5. Intertubercular (bicipital) groove 6. Deltoid tuberosityD. Glenohumeral Joint 1. Diarthrodial a. multiaxial ball-and-socket 2. Most mobile joint 3. Shallow joint cavity 4. Loose joint capsule E. Glenohumeral Joint Movements 1. Typical occurs with movement of scapula (shoulder girdle) 2. Wide ROM in all planes 3. Common instability problems a. rotator cuff impingement b. subluxations and dislocations 4. High mobility = reduced stability F. G l e n o i d L a b r u m 1. Slightly enhances stability 2. Acts like a suction cup G. Shoulder Bursae 1. Bursa a. Flattened sac with synovial fluid b. Subacromial c. Subscapular 2. Bursitis H. Glenohumeral Joint Ligaments 1. Lax until extreme ROM a. Glenohumeral- superior, middle, inferior b. Coracohumeral Rotator Cuff 1. Dynamic support 2. SITS: supraspinatus, infraspinatus, teres minor, and subscapularis a. attach to humeral head b. maintain humeral head in correct position c. frequently injured J. Muscles 1. Intrinsic glenohumeral muscles a. rotator cuff group b. deltoid c. coracobrachialis d. teres major 2. Extrinsic glenohumeral muscles a. latissimus dorsi b. pectoralis major c. biceps brachii d. triceps