What type of tissue does a scar typically form after an injury?

After an injury, a scar typically forms from the dermal layer of the skin, which is composed primarily of collagen and connective tissue. Scarring occurs when the normal healing process replaces damaged tissue with fibrous tissue. The dermal basement is a layer of connective tissue that separates the epidermis from the dermis, and plays a crucial role in wound healing. During the healing process, fibroblasts in the area are activated and produce collagen, leading to the formation of a scar.

The other options do not accurately represent where scar tissue is formed. For example, subcutaneous tissue is the layer of fat and connective tissue beneath the dermis that provides insulation and cushioning but is not directly involved in the formation of scars. The surficial layer, which refers to the uppermost part of the skin, would not typically undergo changes that lead to scarring in response to injury. The muscle layer is not relevant to skin injury healing, as it lies deeper beneath the skin and is not involved in the formation of scars when the skin itself is injured.