What is the Joint Capsule made up of?
It is a Fibrous Sheath
What is the function of the Joint Capsule?
To enclose the Structures of the Joint
Where does the Glenohumeral Joint Capsule extend between?
From - Anatomical Neck of the Humerus
To - Border of the Glenoid Fossa
- How is the Joint Capsule described?
2. To permit greater mobility (particularly Abduction)
What lines the inner surface of the Joint Capsule?
The Synovial Membrane
What does the Synovial Membrane produce?
What is the function of the Synovial Fluid?
To reduce friction between the 2 articulating surfaces
What is present to reduce friction in the Glenohumeral Joint?
What is a Bursa?
A Sac filled with Synovial Fluid
What is the purpose of a Bursa?
To act as a Cushion between the Tendons and other Joint Structures
What are the 2 Clinically Important Bursae in the Glenohumeral Joint?
- Subacromial Bursa
2. Subscapular Bursa
Where is the Subacromial Bursa found?
- Inferior to the Deltoid
- Inferior to the Acromion
- Superior to the Supraspinatus Tendon
- Superior to the Joint Capsule
What is the function of the Subacromial Bursa?
To support the Deltoid and Supraspinatus Muscles
What is the Clinical Significance of the Subacromial Bursa?
Inflammation can cause several shoulder problems
What is the Subscapular Bursa found between?
- The Subscapularis Tendon
2. The Scapula
What is the function of the Subscapular Bursa?
To reduce “Wear and Tear” on the Tendon during movement of the shoulder
Are the Subacromial and Subscapular Bursae the only ones present in the Glenohumeral Joint?
No, there are others present between the tendons of the muscles around the joint
What common sporting injury damages the subacromial bursa?
- Subacromial Bursitis - a type of Rotator Cuff injury