Final answer:
The dermis is the layer of skin that contains collagenous and elastic fibers which enable the skin to flex with bodily movement.
Step-by-step explanation:
The collagenous and elastic fibers that make it possible for the skin to flex with movement of the body are found in the dermis. The dermis is made of two layers of connective tissue which include collagen fibers, providing toughness, and elastin fibers, contributing to elasticity. These fibers are produced by fibroblasts and form an interconnected mesh in the dermis, allowing the skin to stretch and return to its original shape.
The dermis is attached to the epidermis through collagen fibers and houses important structures like hair follicles, sweat glands, oil glands, and blood vessels. It contains many nerve endings that allow for the senses of touch, pressure, heat, and pain. Therefore, it plays a crucial role in the flexibility and sensory functions of the skin.