Dictionary > Dermis

Dermis

Definition
noun
Mesodermally-derived connective tissue underlying the epithelium of the skin
Supplement
In humans, the skin is the largest organ of the integumentary system. The role of the skin is vital as it protects the body (especially the underlying tissues) against pathogens and excessive water loss. It is also involved in providing insulation, temperature regulation and sensation. The skin of humans and other mammals is composed of two major layers: (1) epidermis and (2) dermis. The structure that separates the two layers is the basement membrane.
The dermis is the layer of the skin below the epidermis and above the subcutaneous tissues. It is made up of connective tissues (especially, dense irregular connective tissues), blood vessels, lymph vessels, and nerve endings. In humans and other mammals, hair follicles and sweat glands are also present in the dermis.
There are two main layers of dermis: the papillary dermis (closer to the epidermal layer) and the reticular dermis (deeper, thicker layer). The papillary dermis is made up of areolar connective tissues. Its name is derived from the dermal papillae it forms. These papillae are small, nipple-like extensions of the dermis into the epidermis. The reticular dermis is composed of dense irregular connective tissue. The presence of these connective tissues makes the dermis elastic.
Word origin: Greek dérma (“skin, hide”), from dérō (“to skin, to flay”)
Synonym(s):

  • corium
  • cutis
  • cutis vera
  • true skin

See also:

  • skin
  • epidermis
  • dermatitis
  • papillary dermis
  • reticular dermis
  • Related form(s):

    • dermal (adjective, of, relating to, or characterized by, the dermis)


    You will also like...

    green leaf - close up view
    Leaves

    Leaves are the major photosynthetic organ of a plant. Apart from that, they are also crucial to water movement. In this ..

    Genetics and Evolution
    Genetics and Evolution

    Humans are diploid creatures. This means that for every chromosome in the body, there is another one to match it. Howeve..

    Regulation of Biological Systems
    Regulation of Biological Systems

    Regulation of Biological Systems tutorials are focused on the modulation of biological systems from cell to population l..

    Wart-like leaf galls on grape leaves
    Plant Cell Defense

    Plants protect themselves by releasing hydrogen peroxide to fight against fungal invasion. Another way is by secreting c..

    Developmental Biology
    Developmental Biology

    Developmental biology is a biological science that is primarily concerned with how a living thing grows and attains matu..

    kinesin motor proteins transporting molecules across microtubules
    Movement of Molecules Across Cell Membranes

    Molecules move within the cell or from one cell to another through different strategies. Transport may be in the form of..