There are usually three openings in the capsule.

One anteriorly, below the coracoid process, establishes a communication between the joint and a bursa beneath the tendon of the Subscapularis.

The second, which is not constant, is at the posterior part, where an opening sometimes exists between the joint and a bursal sac under the tendon of the Infraspinatus.

The third is between the tubercles of the humerus, for the passage of the long tendon of the Biceps brachii.
There are usually three openings in the capsule.
One anteriorly, below the coracoid process, establishes a communication between the joint and a bursa beneath the tendon of the Subscapularis.
The second, which is not constant, is at the posterior part, where an opening sometimes exists between the joint and a bursal sac under the tendon of the Infraspinatus.
The third is between the tubercles of the humerus, for the passage of the long tendon of the Biceps brachii.
Capsule of the glenohumeral joint