Final answer:
Directly beneath the basal lamina is the areolar connective tissue layer of the underlying connective tissue, known as the lamina propria, which supports the epithelium and forms a part of the basement membrane, providing strength and flexibility.
Step-by-step explanation:
Directly deep to the basal lamina is a layer of areolar connective tissue belonging to the underlying connective tissue. This layer is also known as the lamina propria and supports the fragile epithelial layer. The basal lamina is a thin extracellular layer that lies underneath epithelial cells and separates them from other tissues. Situated below the basal lamina is the reticular lamina, which along with the basal lamina forms the basement membrane. This structure provides strength and flexibility to the tissue, maintaining a bond between the epithelial cells and the connective tissue underneath.
It's also permeable to allow material passage. The papillary layer of the dermis, consisting of loose areolar connective tissue, often extends into the epidermis to form dermal papillae. These projections serve to increase the strength of the connection between the epidermis and dermis. The papillary layer contains a variety of cells and structures including fibroblasts, phagocytes, small blood vessels, lymphatic capillaries, nerve fibers, and touch receptors, thus playing a critical role in both the structural integrity and function of the skin.