👉 The term "infraspinatus" is a medical term used to describe the muscle that connects the shoulder blade (the foramen magnum) to the ulna. The infraspinatus muscle acts as a stabilizer of the shoulder joint, helping to prevent it from moving out of place or getting injured. In addition to its role in shoulder stability, the infraspinatus is also involved in the movement of the arm and hand. It plays a crucial role in the transfer of