The dermis, or corium, is a layer of skin that consists of the epidermis and subcutaneous tissue. It absorbs tension and stress from the body and is referred to as the “subcutaneous tissue”.

It can be divided into two parts: the area closest to the epidermis, known as the papillary area, and the deeper part called the reticulate area. Through the basal membrane, the dermis is tightly connected to the epidermis. The dermis’ structural components are collagen, elastic fibers, and a matrix made up of fibers. Learn more about the function of the dermis.



Dermis function


Papillary dermis


The highest layer of the dermis is the papillary skin. It is intertwined between the backs and the epidermis. It consists of small, loosely arranged collagen fibers. The papillary area is made up of loose connective tissues. Its name derives from the finger-like projections called “warts” that reach towards the epidermis. They either contain the terminal capillary networks or the tactile Meissner.


Reticulate skin


The lower layer of the dermis called the “reticulated skin” is located below the papillary skin. It is composed of dense and irregular connective tissue, densely packed with collagen fibers, and is known as the “reticulated skin”. This is where you will find flexible skin fibers.


The mesh area is typically thicker than the papillary skin above it. The dense combination of elastic, collagen, and mesh fibers intertwined in the mesh gives it its name. These protein fibers provide the dermis with strength, stretchability, and elasticity.


The reticulate contains the roots of the hair, the sebaceous and sweat glands, blood vessels, receptors, nails, blood vessels, and the roots of the hair. Langer’s lines are tension lines that form from the orientation of collagen fibers within the reticular skin. These lines have some importance in wound healing and surgery.



Dermal papillae


Dermal papillae, or singular papillae, are smaller than average nipplelike extensions (or interdigitations), of the dermis into the epidermis. They are found on the skin of your hands and feet as epidermal or palermal ridges (commonly known as fingerprints).


The dermal papillae contain blood cells that nourish hair follicles. They also provide oxygen to the epidermal layers. The dermal papillae form part of the topmost layer of the dermis. They are also known as the papillary dermis and the ridges and epidermis.


The primary function of the particular dermis to assist the epidermis is to increase the exchange of oxygen, nutrients, and waste materials. Addiction is the elevation of the epidermal and dermal layers at the junction.


The role of dermal papillae is also crucial in curly hair growth and formation. In mucous membranes, the corresponding structures are dermal papillae are generally termed “connective tissue papillae”, which interdigitate with the rete pegs of the superficial epithelium.