Final answer:
Bone markings are surface features of bones that can be classified into articulations, projections, and holes. Slight, elongated ridge is an example of a projection bone marking that serves as an attachment point for tendons and ligaments.
Step-by-step explanation:
Bone markings are the surface features of bones, and there are three general classes of bone markings: articulations, projections, and holes. Slight, elongated ridge is an example of a bone marking that falls under the projection category. Projections are areas of a bone that project above the surface of the bone and serve as attachment points for tendons and ligaments. The size and shape of these projections indicate the forces exerted through the attachment to the bone.