Which layer of the skin contains connective tissue and is responsible for structural strength?

The dermis is the correct answer because it is the middle layer of the skin that contains a dense network of connective tissue. This layer is crucial for structural integrity and strength, providing the skin with its resilience and flexibility. The dermis houses various structures, including blood vessels, hair follicles, and nerve endings, which also contribute to its functional properties.

The connective tissue in the dermis consists primarily of collagen and elastin fibers, which are vital for maintaining the supportive framework of the skin. This layer is thicker than the epidermis and plays a critical role in anchoring the skin and its components effectively.

The hypodermis, also known as the subcutaneous layer, lies below the dermis and primarily consists of fat and connective tissue, serving mainly as insulation and energy storage. The epidermis is the outermost layer of the skin, primarily composed of epithelial cells, which do not provide structural strength. While the subcutaneous layer is sometimes referred to interchangeably with the hypodermis, it lacks the dense connective tissue characteristic of the dermis, further distinguishing it from the dermal layer.