Which instrument is useful for enlarging incisions during procedures?

The correct choice in this scenario highlights the significance of scissors in surgical procedures. Scissors are specifically designed for cutting tissue, which can include enlarging incisions when necessary. Their precise cutting edges allow for maneuverability and control, making them an ideal choice for extending an incision in a clean and deliberate manner.

While scalpels are indeed used to make initial incisions due to their sharp blades, they are not typically utilized for enlarging existing incisions. Their primary function revolves around initial cuts rather than the incremental adjustments needed to expand an incision.

Periosteal elevators are mainly employed to detach the periosteum from the bone, serving a different role in surgical procedures. They do not function as cutting instruments but rather as tools for lifting and separating tissues.

Needle holders are intended for clamping needles during suturing and do not have a cutting function. Their role is limited to facilitating the stitching process, which is essential for wound closure rather than incision enlargement.

Thus, scissors are the most effective and appropriate instrument for enlarging incisions during surgical procedures.