Osteology and Arthrology of the Humerus Flashcards
A movement in which the scapula sits approximately 40 degrees relative to the frontal plane and looks like a hugging motion is know as?
Scaption
What joints does abduction of the arm involve?
Glenohumeral Joint, Scapulothoracic articulation, Acromioclavicular Joint, Sternoclavicular Joint
During normal abduction range there is a specific relationship in the amount of movement at which two joints?
Glenohumeral and Scapulothoracic Joints
What are the ratios between the Glenhumeral Joint and Scapulothoracic joint when abducting?
GH-ST
0-15= no movement of the scapula
15-120= 2:1 (GH-ST)
120-FULL= 1-1 (GH-ST)
During abduction the humerus must undergo what movement to fully abduct the arm?
External rotation
Where does the greater trochanter fit into once the Humerus is fully abducted?
Coracoacromial Arch
What part of the Scapula articulates with the Humerus?
Glenoid Fossa
What kind of joint is Glenohumeral?
Synovial Ball and Socket
What are the movements of Glenohumeral Joint?
Extension/Flexion Abduction/ Adduction Internal/ External Rotation Circumduction Scaption
What is the Glennoid Labrum and what does it do?
fibrocartilagenous Ring that attaches to the glenoid fossa
it deepens the joint
Where is the Glenoid Humeral Joint the weakest?
Inferiorly via the axilla
Glenhumeral has a weak spot on the anterior portion, what is this weak spot known as?
Foramen of Weitbrecht
What does the Coracohumeral ligament attach to?
Coracoid processGreater Tubercle
What are the two ligaments in the Glenhumeral Joint?
Coracohumeral ligament
Glenohumeral Ligament
What are the Bursas of the Glenohumeral joint?
Subacromial bursa
Subdeltoid Bursa
