The tendons and ligaments of the shoulder are cushioned by several fluid filled bursae. Bursae within the the shoulder reduce friction where large muscles and tendons pass across the joint capsule. Two prominent shoulder bursae are: the subscromial-subdeltoid and subscapular bursae. The subacromial-subdeltoid is the main bursae of the shoulder and the largest of the bursae within the body. Begining at the coracoid process, the bursae extends laterally over the superior surface  of the supra and infra spinatus tendons, it extends beyond the acromion and continues beneath the deltoid muscle to the greater tubercle of the humerus. This bursae cushions the rotator cuff muscles and coracoacromial arch. The subscapular bursae is located between the subscapularis tendon and the scapula. It communicates with the synovial cavity through an opening in the joint capsule. The bursae protects the subscapularis tendon, where it passes inferiorly to the coracoid process and over the neck of the scapula.