Which part of the dermis contains collagen fibers?

The reticular layer of the dermis is primarily composed of dense connective tissue that includes a high concentration of collagen fibers. These collagen fibers provide strength, elasticity, and structural support to the skin. The reticular layer lies beneath the papillary layer and forms the bulk of the dermis, featuring a coarser network of fibers that helps maintain the skin’s integrity during movement and other stresses.

In contrast, the papillary layer, which is located above the reticular layer, contains a more loosely arranged collagen and elastin fibers, along with capillaries and sensory receptors, and primarily serves to nourish the epidermis and support its functions. The subcutaneous layer, also known as the hypodermis, consists mostly of fat and connective tissues, providing insulation and cushioning rather than structural support, while the basal layer refers to a part of the epidermis where new skin cells are generated, lacking the collagen fibers found in the dermis. Thus, the reticular layer stands out as the correct answer, containing the complex network of collagen essential for the skin's durability.