American Academy of Professional Coders (AAPC) 2026 – 400 Free Practice Questions to Pass the Exam

The dermis is composed of two distinct layers known as the stratum papillare and the stratum reticulare. The stratum papillare is the uppermost layer, characterized by a thin composition consisting of loose connective tissue. This layer contains dermal papillae, which are small, nipple-like projections that interdigitate with the epidermis. These projections enhance the surface area for exchange of oxygen, nutrients, and waste removal and play a critical role in thermoregulation and sensation.

The stratum reticulare is the deeper layer of the dermis, made up of dense irregular connective tissue. This layer provides strength, elasticity, and structural support to the skin due to the abundance of collagen and elastin fibers. It houses various structures, including blood vessels, glands, and hair follicles, all of which are essential for skin function and overall homeostasis.

In the context of the other options, the layers mentioned do not pertain to the dermis. Stratum lucidum and stratum corneum are layers of the epidermis, providing protection and a barrier function. Stratum basale and stratum spinosum are also epidermal layers that contribute to cell generation and structural integrity. Stratum granulosum is another layer