Dermis and Skin Structure

These flashcards cover key concepts regarding the structure and function of the dermis and skin, including its layers, cells, and associated markings.

What are the main types of cells found in the dermis?

Fibroblasts, macrophages, and occasionally mast cells and white blood cells.

What percentage of the dermal thickness does the reticular layer account for?

Approximately 80%.

What are dermal papillae?

Projections that contain capillary loops and free nerve endings; they enhance gripping ability and contribute to the sense of touch.

What properties do elastic fibers in the reticular layer provide?

Stretch-recoil properties.

What do cleavage lines in the reticular dermis indicate?

Surgeons should make incisions parallel to cleavage lines to minimize gapping and promote better healing.

What are striae commonly referred to as?

Stretch marks.

What causes the formation of blisters?

Acute, short-term traumas to the skin that cause fluid-filled pockets separating the epidermal and dermal layers.

What type of connective tissue is the papillary layer composed of?

Loose connective tissue with collagen and elastic fibers.

What is the main function of the dermal papillae in thick skin?

They contribute to the formation of epidermal ridges, enhancing gripping ability and creating unique fingerprint patterns.

What is located in the hypodermis?

Adipose tissue; it is not part of the skin.