Which term describes the bulbous shape found at the ends of long bones for muscle attachments?

The term that describes the bulbous shape found at the ends of long bones for muscle attachments is "epiphysis." The epiphysis is the rounded end part of a long bone, which is typically wider than the shaft. This structure serves as the site for muscle attachment through tendons and ligaments, as well as the area where the bone articulates with adjacent bones at joints. The bulbous shape provides an increased surface area for these attachments, facilitating movement and stability.

In addition to its role in muscle attachment, the epiphysis is also important in the context of growth and development, as it contains the growth plate (epiphyseal plate) in children and adolescents. The epiphysis, being at the ends of the bones, contributes to the overall shape and functionality of the skeletal system.

The other options do not fulfill this description. Articular cartilage covers the surfaces of the epiphysis at joints, providing a smooth surface for articulation but does not itself describe the bulbous shape. The diaphysis is the long, tubular shaft of the bone, and the periosteum is a dense layer of connective tissue surrounding the diaphysis, serving as a point of attachment for muscles and a conduit for blood vessels but is not