What is the portion of the casket interior that covers the hinges called?

The portion of the casket interior that covers the hinges is referred to as the hinge cover. This component serves both aesthetic and functional purposes. It helps to conceal the mechanical parts of the casket that might otherwise be visible, creating a more polished and elegant appearance. Additionally, it can serve to protect the hinges from dust and debris, ensuring that the casket operates smoothly. By providing a seamless transition between the casket's interior and its hardware, the hinge cover enhances the overall presentation of the casket.

The other options, while potentially intuitive, do not accurately describe this specific part. The casket liner refers to the fabric that lines the entire interior of the casket, while the hinge skirt and hinge protector are not commonly used terms in the context of casket design. Therefore, the hinge cover is the appropriate terminology for this component.