Which burn degree extends into deeper tissues such as muscles or bones?

• A. 1st degree burn
• B. 3rd degree burn
• C. 4th degree burn
• D. 2nd degree burn

Answer: (C)

The key idea is depth of tissue damage. When a burn reaches beyond the skin into deeper structures like muscle or bone, it represents the most severe level of burn injury. This depth goes through the full thickness of the skin and can involve underlying tissues such as muscle and sometimes bone, tendon, or fascia. First-degree burns affect only the surface epidermis and are red and painful. Second-degree burns involve part of the dermis with blisters but don’t usually reach the deepest structures. Third-degree burns, or full-thickness burns, destroy the entire skin layer and may involve subcutaneous tissue, but the fourth-degree burn extends even further, into muscles or bones. Because it penetrates so deeply, nerves can be damaged, which may alter sensation in the area, and these injuries typically require surgical treatment and extensive medical care. In practice, avoid treating burned skin and refer for urgent medical evaluation when such deep tissue involvement is possible.