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Unformatted text preview: LAB 4: BONES AND MUSCLES OF THE SHOULDER AND ARM BONE AND BONY LANDMARK IDENTIFICATION Bony Landmarks of the Clavicle •conoid tubercle •acromial end (distal/lateral end) •sternal end (proximal/medial end) Identify the medial and lateral ends. Which structures does either end of the clavicle articulate with? Bony Landmarks of the Scapula •spine •medial (vertebral) border •acromion (acromion process) •infraglenoid tubercle •supraspinous fossa •glenoid fossa (cavity) •infraspinous fossa •coracoid process •superior angle •subscapular fossa •inferior angle •suprascapular notch •angle of acromion •supraglenoid turbercle •lateral (axillary) border Bony Landmarks of the Humerus (Proximal) •head •greater tubercle •anatomical neck •body (shaft) •surgical neck •lesser tubercle •deltoid tuberosity •intertubercular groove (bicipital groove) 1. What is the weakest part of the clavicle? 2. Find/palpate the sternoclavicular joint. 3. Note how the size of the humeral head relative to the glenoid fossa contributes to the instability of the glenohumeral joint. What structures help to stabilize this joint? 4. What is the scapulothoracic joint? 5. How does the scapula move during: depression; elevation; retraction; protraction? 6. There is a disarticulated humerus in front of you. How would you determine whether a humerus is from the left or right side? 7. Find/palpate the following landmarks: o acromion o inferior angle of the scapula o spine of the scapula o vertebral border of the scapula MUSCLES FROM THE AXIAL SKELETON TO THE CLAVICLE AND SCAPULA Origin •Trapezius Insertion Action •Serratus anterior •Rhomboid major •Rhomboid minor •Levator scapulae MUSCLES FROM THE AXIAL SKELETON TO THE HUMERUS Origin Insertion Action •Latissimus Dorsi •Pectoralis Major MUSCLES FROM THE SHOULDER GIRDLE TO THE HUMERUS Origin •Deltoids Insertion Action •Teres Major •Supraspinatus •Infraspinatus •Teres Minor •Subscapularis 1. What muscles are responsible for each of the following actions at the shoulder? o Flexion and extension o Abduction and adduction o Internal and external rotation 2. Come up with some exercises that specifically train/strengthen some of the rotator cuff muscles. 3. Name 2 muscles at the elbow, 2 muscles at the shoulder, and 1 muscle of the scapulothoracic joint that are involved in the performance of a push ­up. 4. Explain why the latissumus dorsi is sometimes called the ‘swimming muscle’. 5. Contract and palpate the following muscles: o trapezius o pectoralis major o latissimus dorsi o deltoids (all 3 heads) ...
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This note was uploaded on 05/21/2011 for the course BHK 190 taught by Professor Janice during the Spring '11 term at UBC.

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