The layer of the skin that contains bundles of collagen and elastic fibers responsible for the strength of the skin is the reticular layer.
The dermis is the tissue layer between the epidermis and the subcutaneous tissue. Its structure is composed of collagen, elastic tissue, and other components such as hair follicles, nerve endings, and glands.
The dermis is divided into two layers: the papillary dermis and the reticular demis. Papillary dermis contains loose areolar connective tissue, while reticular dermis contains bundles of collagen, elastic fibers, and reticular fibers.
Hypodermal is an incorrect answer because it pretty much only contains loose areolar connective tissue and adipose tissue. Subcutaneous is incorrect because it's just another name for hypodermal layer. Epidermal is incorrect because it's first layer of the skin that contains mainly melanocytes and keratinocytes.
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