What is the upper dermis?

What is the upper dermis?

The papillary dermis is the uppermost layer of the dermis. It intertwines with the rete ridges of the epidermis and is composed of fine and loosely arranged collagen fibers. The papillary region is composed of loose areolar connective tissue.

What is the top layer of skin and what is its function?

The epidermis, the outermost layer of skin, provides a waterproof barrier and creates our skin tone. The dermis, beneath the epidermis, contains tough connective tissue, hair follicles, and sweat glands. The deeper subcutaneous tissue (hypodermis) is made of fat and connective tissue.

Where is the upper dermis?

The dermis is the second and thickest layer of the three major layers of skin, located between the epidermis and subcutaneous tissues, also known as the subcutis and the hypodermis.

What are dermis layers?

The dermis has connective tissue, blood vessels, oil and sweat glands, nerves, hair follicles, and other structures. It is made up of a thin upper layer called the papillary dermis, and a thick lower layer called the reticular dermis. Enlarge. Anatomy of the skin, showing the epidermis, dermis, and subcutaneous tissue.

What are the five layers of the epidermis and their functions?

The 5 Layers of Your Skin

  • Stratum Basale or Basal Layer. The deepest layer of the epidermis is called the stratum basale, sometimes called the stratum germinativum.
  • Stratum Spinosum or the Spiny layer. This layer gives the epidermis its strength.
  • Stratum Granulosum or the Granular Layer.
  • Stratum Lucidum.
  • Stratum Corneum.

Does dermis thicken with age?

Intrinsic aging is the aging process that takes place over the years regardless of external influences. After the age of 20, one percent less of collagen is produced in the dermis each year (2). The collagen and elastin fibers break, thicken, stiffen, clump together, and lose their elasticity.

What is the role of the dermis in the body?

The dermis is a fibrous structure composed of collagen, elastic tissue, and other extracellular components that includes vasculature, nerve endings, hair follicles, and glands. The role of the dermis is to support and protect the skin and deeper layers, assist in thermoregulation, and aid in sensation.

How does the dermis interact with the epidermis?

Interactions With the Epidermis. Cells in the epidermis influence the dermis, and in turn, (via activities such as mast cells which secrete cytokines) influence the turnover of cells in the epidermis. It is the interaction of these two layers that is, in fact, most disrupted in some conditions such as psoriasis.

Why are the papillae important to the dermis?

Dermal papillae. The dermal papillae are part of the uppermost layer of the dermis, the papillary dermis, and the ridges they form greatly increase the surface area between the dermis and epidermis. Because the main function of the dermis is to support the epidermis, this greatly increases the exchange of oxygen, nutrients,…

What happens when the surface area of the dermis decreases?

The surface area or amount of contact between the dermis and epidermis also decreases. This results in less blood being made available from the dermis to the epidermis and fewer nutrients making it to this outer layer of skin. This flattening out of the connecting region also makes the skin more fragile.

The dermis is a fibrous structure composed of collagen, elastic tissue, and other extracellular components that includes vasculature, nerve endings, hair follicles, and glands. The role of the dermis is to support and protect the skin and deeper layers, assist in thermoregulation, and aid in sensation.

Interactions With the Epidermis. Cells in the epidermis influence the dermis, and in turn, (via activities such as mast cells which secrete cytokines) influence the turnover of cells in the epidermis. It is the interaction of these two layers that is, in fact, most disrupted in some conditions such as psoriasis.

Dermal papillae. The dermal papillae are part of the uppermost layer of the dermis, the papillary dermis, and the ridges they form greatly increase the surface area between the dermis and epidermis. Because the main function of the dermis is to support the epidermis, this greatly increases the exchange of oxygen, nutrients,…

The surface area or amount of contact between the dermis and epidermis also decreases. This results in less blood being made available from the dermis to the epidermis and fewer nutrients making it to this outer layer of skin. This flattening out of the connecting region also makes the skin more fragile.