Where is the proximal attachment of the infraspinatus muscle located?

The infraspinatus muscle has its proximal attachment at the infraspinous fossa of the scapula. This is a specific region on the posterior aspect of the scapula that is situated just below the spine of the scapula. The infraspinatus fossa provides an ideal surface for the infraspinatus muscle to anchor itself, allowing it to effectively contribute to shoulder movements, particularly external rotation of the arm. This anatomical relationship is crucial for the muscle's function as it enables the infraspinatus to exert force when the arm is positioned, making it an important muscle in the rotator cuff group. The other options involve various areas of the scapula but do not serve as the correct attachment site for the infraspinatus muscle.