Glenohumeral Joint Flashcards
What type of joint is the glenohumeral joint?
a ball and socket synovial joint.
What does the glenohumeral joint do?
Permits a wide range of movement; although its mobility makes it unstable.
The large spherical _____ articulates with the relatively small and shallow _____ of the scapula.
humeral head; glenoid cavity
What is the deepened slightly ring-like, fibrocartilaginous aspect of the glenoid cavity?
glenoid labrum.
Both articular surfaces are covered by?
Hyaline cartilage.
What makes up the rotator cuff?
- Supraspinatus
- Infraspinatus
- Teres Minor
- Subscapularis
What surrounds the glenohumeral joint, and where does it attach?
a loose fibrous layer of the joint capsule, and it attaches medially to the margin of the glenoid cavity.
What is the weakest area of the joint capsule?
The inferior part of the joint capsule, the only part not reinforced by the rotator cuff muscles.
What are the ligaments of the glenohumeral joint?
- Coracohumeral ligament
- Transverse Humeral
- Coraco-acromial arch
- Coraco-acromial ligament.
What do the glenohumeral ligaments do?
strengthen the anterior aspect of the capsule.
What is the coracohumeral ligament
a strong band that passes from the base of the coracoid process to the anterior aspect of the greater tubercle.
What does the coracohumeral ligament do?
Strengthens the capsule superiorly.
The glenohumeral ligaments are _____ ligaments that are part of what?
intrinsic; part of the fibrous layer of the capsule.
What is the Transverse Humeral ligament?
a broad fibrous band that runs from the greater to the lesser tubercle, bridging over the intertubercular sulcus (groove).
What does the Transverse Humeral ligament convert the sulcus into?
a canal for the tendon of the long head of biceps brachii and its synovial sheath.
What is the Coraco-acromial arch?
An extrinsic, protective structure formed by the smooth inferior aspect of the acromion and coracoid process of the scapula.
What does the Coraco-acromial arch lay over?
the head of the humerus.
What does the Coraco-acromial arch prevent?
prevents the humerus from displacing superiorly from the glenoid cavity.
What fractures first the Coraco-acromial arch or the shaft of humerus or clavical?
the shaft of humerus or clavical before the arch.
Where is the Coraco-acromial ligament located?
Between the acromion and coracoid process.
What do bursae contain?
Capillary films of synovial fluid.
Where are bursae located?
near the joint where tendons rub against bones, ligaments, other tendons, or where skin moves over a bony prominence.
What is another name for the subacromial bursa?
subdeltiod bursae
What is the subacromial bursa located?
between the acromion, coraco-acromial ligament, and deltiod superiorly and supraspinatus tendon and joint capsule of the glenohumeral joint inferiorly.
Where is the subscapular bursa located?
Between the tendon of the subscapularis and the neck of the scapula.
What are two types of bursae?
- Subacromial bursa
2. Subscapular bursa
What gives the glenohumeral joint most stable control?
Muscular control.
