Dermal papillae

Dermal papillae
Dermal papilla labeled at top
Papilla of the hand, treated with acetic acid. Magnified 350 times. A. Side view of a papilla of the hand. a. Cortical layer. b. Tactile corpuscle. c. Small nerve of the papilla, with neurolemma. d. Its two nervous fibers running with spiral coils around the tactile corpuscle. e. Apparent termination of one of these fibers. B. A tactile papilla seen from above so as to show its transverse section. a. Cortical layer. b. Nerve fiber. c. Outer layer of the tactile body, with nuclei. d. Clear interior substance.
Latin	papillae dermis
Code	TH H3.12.00.1.03003

In the human skin, the dermal papillae (DP) (singular papilla, diminutive of Latin papula, 'pimple') are small, nipple-like extensions (or interdigitations) of the dermis into the epidermis. They can be observed at the surface of the skin in hands and feet as epidermal or papillary ridges (colloquially known as fingerprints).

The dermal papillae nourishes all hair follicles and bring food and oxygen to the lower layers of epidermal cells. The pattern of ridges they produce in hands and feet are inherited features that are developed before birth. They remain unaltered (except in size) throughout life, and are therefore used for fingerprints. ^[1]

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 dermis' main function is to support the epidermis, this greatly increases the exchange of oxygen, nutrients, and waste products between these two layers. Additionally, the increase in surface area prevent the dermal and epidermal layers from separating from each others by strengthening the junction between them. With age, the papillae tend to flatten and sometimes increase in numbers. ^[2]

Dermal papillae also play a pivotal role in hair formation, growth and, cycling. ^[3]

See also

• Papilla (disambiguation)

References

1. ^ "Dermal papillae". Probert Encyclopaedia. http://www.probertencyclopaedia.com/cgi-bin/res.pl?keyword=Dermis&offset=0. Retrieved February 2010. 
2. ^ "Friction Skin". Ridges and Furrows. http://ridgesandfurrows.homestead.com/friction_skin.html. Retrieved February 2010. 
3. ^ Lin, Chang-min et al. (October 2008). "Microencapsulated human hair dermal papilla cells: a substitute for dermal papilla?". Archives of Dermatological Research (Springer) 300 (9): 531–535. doi:10.1007/s00403-008-0852-3. http://www.ingentaconnect.com/content/klu/403/2008/00000300/00000009/00000852. 

External links

• papilla+of+dermis at eMedicine Dictionary
• Organology at UC Davis Integument/horn/horn3/horn4 - "Mammal, bovine horn (LM, Medium)"

This anatomy article is a stub. You can help Wikipedia by expanding it.v · Categories: Anatomy stubs Skin anatomy Wikimedia Foundation. 2010. Игры ⚽ Нужно решить контрольную? Only Our Rivers Run Free Lorna (film) Look at other dictionaries: dermal papillae — n. external projections of the dermis which interlock with the withdrawing in the overlying epidermis …   English contemporary dictionary Dermal denticle — Denticles are body surface structures found on some fish and insects.Denticles or placoid scales are small outgrowths which cover the skin of many cartilaginous fish including sharks. They are similar in structure to teeth, and teeth may have… …   Wikipedia integument — /in teg yeuh meuhnt/, n. 1. a natural covering, as a skin, shell, or rind. 2. any covering, coating, enclosure, etc. [1605 15; < L integumentum a covering. See IN 2, TEGUMENT] Syn. 1. cortex, involucre, involucrum. * * * Covering of the body,… …   Universalium papilla — Any small, nipplelike process. SYN: teat (3). [L. a nipple, dim. of papula, a pimple] acoustic p. SYN: spiral organ. basilar p. the auditory sense organ of birds, amphibians, and reptiles; homologous to the …   Medical dictionary ridge — 1. A (usually rough) linear elevation. SEE ALSO: crest. 2. In dentistry, any linear elevation on the surface of a tooth. 3. The remainder of the alveolar process and its soft …   Medical dictionary Papilla — The term papilla (plural: papillae) generally means a nipple like structure, and may refer to: Mammary papilla, or nipple Amphibian papilla and basal papilla, part of the inner ear of the frog. Interdental papilla, part of the gingiva between… …   Wikipedia Dermis — This article is about the layer of skin. For the website, see DermIS (Dermatology Information System). Dermis Latin dermis; corium Code TH H3.12.00.1.03001 …   Wikipedia fingerprint — /fing geuhr print /, n. 1. an impression of the markings of the inner surface of the last joint of the thumb or other finger. 2. such an impression made with ink for purposes of identification. 3. any unique or distinctive pattern that presents… …   Universalium Dermatitis herpetiformis — Classification and external resources Dermatitis herpetiformis characteristic rash ICD 10 L …   Wikipedia mammal — mammallike, adj. /mam euhl/, n. any vertebrate of the class Mammalia, having the body more or less covered with hair, nourishing the young with milk from the mammary glands, and, with the exception of the egg laying monotremes, giving birth to… …   Universalium 18+ © Academic, 2000-2024 Contact us: Technical Support, Advertising Dictionaries export, created on PHP, Joomla, Drupal, WordPress, MODx. Mark and share Search through all dictionaries Translate… Search Internet Share the article and excerpts Direct link … Do a right-click on the link above and select “Copy Link”