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...

    Endemic Flora of New Zealand
    New Zealand’s Unique Flora

    If New Zealand has lots of unique animals, it's also got a whole lot of unique plants. Find out more about some of them,..

    Geological Periods
    Geological Periods

    Geological periods is a study guide that cites the different geological periods on Earth's timeline. Each has a brief ov..

    Ecosystem Succession
    Ecosystem Succession

    If the balance of nature is left untouched, landscapes can change dramatically over time. A previous ecosystem is supers..

    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..

    Human perception in action
    Human Perception – Neurology

    This tutorial investigates perception as two people can interpret the same thing differently. Know more about human perc..

    Birth of a Human Baby
    Birth of a Human Baby

    Following nine months inside the mother's womb is the birth of the baby. Know the different stages of the birthing proce..