Which of the following bursae communicates with shoulder joint ?
**Core Concept**
The shoulder joint, also known as the glenohumeral joint, is a ball-and-socket joint that allows for a wide range of motion. It is surrounded by several bursae that reduce friction between the bones, tendons, and muscles. One of these bursae communicates with the shoulder joint, allowing for the exchange of synovial fluid and pressure.
**Why the Correct Answer is Right**
The subacromial bursa communicates with the shoulder joint through a small opening in the joint capsule. This allows for the exchange of synovial fluid and pressure, which helps to reduce friction between the humeral head and the acromion process. The subacromial bursa is located between the acromion process and the supraspinatus tendon, and it plays a crucial role in reducing friction and allowing for smooth movement of the shoulder joint.
**Why Each Wrong Option is Incorrect**
* **Option A:** The subscapular bursa is located between the subscapularis tendon and the shoulder joint, but it does not communicate with the joint.
* **Option B:** The infraspinatus bursa is located between the infraspinatus tendon and the humerus, but it does not communicate with the shoulder joint.
* **Option C:** The subcoracoid bursa is located between the coracohumeral ligament and the subscapularis tendon, but it does not communicate with the shoulder joint.
**Clinical Pearl / High-Yield Fact**
The subacromial bursa is a common site of inflammation and injury, particularly in individuals who participate in overhead activities or sports. Inflammation of the subacromial bursa is known as subacromial bursitis, and it can cause pain and limited mobility in the shoulder joint.
**Correct Answer:** C.