The mastoid notch is a small indentation located on the underside of the mastoid process, which is a bony prominence behind the ear. This notch serves as an important anatomical landmark, providing a point of attachment for the digastric muscle, which plays a role in the movement of the jaw. In addition to its muscular connections, the mastoid notch is situated near the temporal bone of the skull. It is significant in various medical procedures, particularly those involving the ear and surrounding structures, as it helps guide surgeons in navigating the complex anatomy of the region.