Final answer:
A fourth-degree burn is the type of burn that involves all skin layers along with muscle and bone, often requiring immediate medical attention, surgery, and skin grafting.
Step-by-step explanation:
The type of burn that involves all skin layers along with muscle and bone is known as a fourth-degree burn. Unlike a first-degree burn, which affects only the epidermis and might resemble a mild sunburn, or a second-degree burn, which extends into the dermis and presents with blistering and potential scarring, a fourth-degree burn goes even deeper. This most severe category of burn damages not just the full thickness of the skin, but also the underlying muscle and bone. A fourth-degree burn is typically not as painful immediately because the nerve endings responsible for sensing pain have been damaged. However, these burns are life-threatening and require immediate specialized medical intervention, often including excision or amputation, followed by skin grafting.