Final answer:
The epidermis is attached to a layer of dense irregular connective tissue known as the dermis, which includes the papillary and reticular layers, providing strength, elasticity, and housing various skin structures.
Step-by-step explanation:
The epidermis is attached to an underlying layer of dense irregular connective tissue called the dermis. The dermis provides strength and elasticity to the skin, largely due to the presence of collagen and elastin fibers. This critical layer of skin contains two sub-layers: the superficial papillary layer, which extends into the epidermis with fingerlike projections called papillae, and the deeper reticular layer, noted for its dense irregular connective tissue. The reticular layer is rich in collagen and elastin, which imparts properties of stretch and strength to the skin, and is populated with numerous structures such as blood vessels, nerve endings, sweat glands, and hair follicles.
Moreover, collagen fibers in the dermis anchor it to the epidermis while interconnected elastin fibers allow for skin elasticity. Beneath the dermis lies the hypodermis, which also connects to the dermis and is composed of loose connective and fatty tissues, providing further insulation and padding to the body.