MSK 10 Flashcards
what type of joint is the scapulothoracic joint?
a physiological joint (no true articulation)
what are the roles of scapulothoracic joint?
- provides a movable base for the humerus (increasing arm ROM at shoulder joint)
- helps deltoid function with proper tension
- provides glenohumeral stability for overhead work
- absorbs shocks to outstretched arms
what are the movement of scapulothoracic joint?
- protraction
- retraction
- elevation
- depression
- rotation of scapula (upward and downward)
What are the articular surfaces for the sternoclavicular joint?
- facet on the medial end of the clavicle
- facet on the manubrium of sternum
what type of joint is the sternoclavicular joint?
modified saddle joint
what are the supportive ligamentsof the sternoclavicular joint?
- sternoclavicular ligament
- interclavicular ligament
- costoclavicular
what are the movements of the sternoclavicular joint?
- elevation of clavicle
- depression of clavicle
- protraction
- retraction
- rotation of clavicle
what are the articular surfaces of the acromioclavicular joint
- facet on the lateral end of the clavicle (acromial facet)
- facet on the medial end of the acromion
what type of joint is the acromioclavicular joint?
planar synovial joint
what is the movement of the acromioclavicular joint?
slide and glide, moves as a result of scapular movements
what are the supportive ligaments of the acromioclavicular joint?
- acromioclavicular ligament
- trapezoid ligament
- conoid ligament
what two ligaments make up for the coracoclavicular ligament which anchors the lateral end of the clavicle and prevents superior dislocation of the AC joint?
trapezoid and conoid ligament
describe the acromioclavicular ligament?
strong fibrous band that reinforces the superior aspect of the AC joint
describe the trapezoid ligament?
extends from the coracoid process of the scapula to the trapezoid line on the inferior lateral end of the clavicle
describe the conoid ligament?
extends from the base of the coracoid process of the scapula to the conoid tubercle on the inferior aspect of the lateral clavicle
what are the articular surfaces of the glenohumeral (shoulder) joint?
the glenoid fossa of the scapula and the head of the humerus
what are the articular surfaces covered by for the glenohumeral joint?
hyaline cartilage
what type of joint is the glenohumeral joint?
ball and socket synovial joint
what is the most mobile joint in the human body?
the shoulder joint
how many planes can the shoulder move in?
3 planes of axis
what is glenoid labrum
a ring of fibrocartilage attached to the margins of the glenoid cavity. It widens the cavity slightly to make the articular surfaces congruent
describe the capsule of the glenohumeral joint?
attaches to the margins of the glenoid cavity medially and to the anatomical neck of the humerus laterally
what are the supportive ligaments of the glenohumeral?
- capsular ligaments
- transverse humeral ligament
- coracohumeral ligament
what is the coracoacromial arch?
extrinsic, protective structure formed by the smooth inferior aspect of the acromion and coracoid processes of the scapula, and the coracoacromial ligament bridging the gap between them. This arch overlies the head of the humerus, preventing its superior displacement from the glenoid cavity
what’s the point of bursae?
serve to decrease friction between the tendon and/or muscle and joint capsule
explain the subacromial bursa?
between the acromion and the tendon of the supraspinatus muscle. It facilitates movements of the supraspinatus tendon under the coracoacromial arch and of the deltoid over the fibrous capsule and greater tubercle of the humerus
explain the subdeltoid bursa?
between the deltoid and the fibrous capsule
what are the movements of the shoulder joints?
- flexion and extension
- adduction
- abduction
- rotation
