Anatomy and function of the subdeltoid bursa

Area of Science:

• Anatomy
• Shoulder Anatomy
• Bursa Anatomy

Background:

• The subdeltoid bursa is crucial for shoulder joint lubrication.
• Understanding its attachments is key to diagnosing shoulder impingement.
• Previous studies have not fully detailed its macroscopic attachments.

Purpose of the Study:

• To precisely define the anatomical attachments and boundaries of the subdeltoid bursa.
• To investigate the macroscopic nerve supply to the subdeltoid bursa.
• To evaluate the relationship between the coracoacromial ligament and the subdeltoid bursa.

Main Methods:

• Anatomical dissection of 40 non-embalmed human cadaver shoulders.
• Macroscopic observation and documentation of bursal attachments.
• Detailed examination of the interface between the subdeltoid bursa and coracoacromial ligament.

Main Results:

• Identified two primary attachment areas: superiorly to the coracoacromial ligament and deltoid, and inferiorly to the humerus.
• No posterior or anterior attachments were observed.
• Observed continuity between the coracoacromial ligament and bursa, suggesting a smooth interface.

Conclusions:

• The subdeltoid bursa has distinct superior and inferior attachments without anterior or posterior connections.
• The smooth bursal surface adjacent to the coracoacromial ligament challenges theories of aggressive ligamentous action on the rotator cuff.