The subscapular fossa is located on the anterior (costal) surface of the scapula, essentially occupying almost the entire front surface of the bone that faces the ribs.
Detailed Explanation
The subscapular fossa is a large, concave depression situated on the costal (anterior) surface of the scapula (shoulder blade). This surface faces the ribs, hence the term "costal." The fossa is characterized by several oblique ridges that run inferomedially across it. These ridges serve as attachment points for the subscapularis muscle.
- Location: Anterior (costal) surface of the scapula.
- Description: Large, concave depression.
- Features: Contains oblique ridges.
- Function: Provides attachment for the subscapularis muscle.
Functionality
The primary function of the subscapular fossa is to provide a broad origin point for the subscapularis muscle, one of the four rotator cuff muscles. This muscle is crucial for internal rotation and adduction of the arm. The size and shape of the fossa directly support the large size and force-generating capacity of the subscapularis muscle.
