Difference between revisions of "Dermis"

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The '''dermis''' is a layer of [[skin]] beneath the [[epidermis (skin)|epidermis]] that consists of [[connective tissue]] and cushions the body from stress and strain. The dermis is tightly connected to the epidermis by a [[basement membrane]]. It also harbors many nerve endings that provide the sense of touch and heat. It contains the [[hair follicle|hair follicles]], [[sweat gland|sweat glands]], [[sebaceous gland|sebaceous glands]], [[apocrine sweat glands|apocrine glands]] and [[blood vessel|blood vessels]]. The blood vessels in the dermis provide nourishment and waste removal to its own cells as well as the Stratum basale of the epidermis.
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The '''dermis''' is a layer of [[skin]] beneath the [[epidermis (skin)|epidermis]] that consists of [[connective tissue]], and cushions the body from stress and strain.The dermis is the lower layer  of skin; contains main blood vessels. The dermis is tightly connected to the epidermis by a [[basement membrane]], and harbors many nerve endings that provide the sense of touch and heat. It contains the [[hair follicle|hair follicles]], [[sweat gland|sweat glands]], [[sebaceous gland|sebaceous glands]], [[apocrine sweat glands|apocrine glands]], and [[blood vessel|blood vessels]]. The blood vessels in the dermis provide nourishment and waste removal to its own cells, as well as the [[Stratum basale]] of the epidermis.
  
 
==Structure==
 
==Structure==
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===Papillary region===
 
===Papillary region===
The papillary region is composed of loose [[areolar connective tissue]]. It is named for its fingerlike projections called ''papillae'', that extend toward the epidermis. The papillae provide the dermis with a "bumpy" surface that interdigitates with the epidermis, strengthening the connection between the two layers of skin.  
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The papillary region is composed of loose [[areolar connective tissue]]. It is named for its fingerlike projections called ''papillae'', which extend toward the epidermis. The papillae provide the dermis with a "bumpy" surface that interdigitates with the epidermis, strengthening the connection between the two layers of skin.  
  
 
In the palms, fingers, soles, and toes, the influence of the papillae projecting into the epidermis forms contours in the skin's surface. These are called ''friction ridges'', because they help the hand or foot to grasp by increasing [[friction]]. Friction ridges occur in patterns (see [[fingerprint]]) that are genetically determined and are therefore unique to the individual, making it possible to use fingerprints or footprints as a means of [[recognition of human individuals|identification]].
 
In the palms, fingers, soles, and toes, the influence of the papillae projecting into the epidermis forms contours in the skin's surface. These are called ''friction ridges'', because they help the hand or foot to grasp by increasing [[friction]]. Friction ridges occur in patterns (see [[fingerprint]]) that are genetically determined and are therefore unique to the individual, making it possible to use fingerprints or footprints as a means of [[recognition of human individuals|identification]].
  
 
===Reticular region===
 
===Reticular region===
The reticular region lies deep in the papillary region and is usually much thicker. It is composed of dense irregular connective tissue, and receives its name from the dense concentration of [[collagen|collagenous]], [[elastic fiber|elastic]], and [[reticular fiber|reticular]] fibers that weave throughout it. These [[protein]] fibers give the dermis its properties of strength, extensibility, and elasticity.  
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The reticular region lies deep to the papillary region and is usually much thicker. It is composed of dense irregular connective tissue, and receives its name from the dense concentration of [[collagen|collagenous]], [[elastic fiber|elastic]], and [[reticular fiber|reticular]] fibers that weave throughout it. These [[protein]] fibers give the dermis its properties of strength, extensibility, and elasticity.  
  
 
Located within the reticular region are also the [[root of the hair|hair roots]], [[sebaceous gland|sebaceous glands]], [[sweat gland|sweat glands]], receptors, [[nail (anatomy)|nails]], and [[blood vessel|blood vessels]].
 
Located within the reticular region are also the [[root of the hair|hair roots]], [[sebaceous gland|sebaceous glands]], [[sweat gland|sweat glands]], receptors, [[nail (anatomy)|nails]], and [[blood vessel|blood vessels]].
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[[Tattoo]] ink is injected into the dermis.  [[Stretch marks]] are also located in the dermis.
 
[[Tattoo]] ink is injected into the dermis.  [[Stretch marks]] are also located in the dermis.
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[[bg:Дерма]]
 
[[bg:Дерма]]
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[[ca:Dermis]]
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[[cs:Škára]]
 
[[de:Dermis]]
 
[[de:Dermis]]
 
[[es:Dermis]]
 
[[es:Dermis]]
 
[[eo:Dermo]]
 
[[eo:Dermo]]
 
[[fr:Derme]]
 
[[fr:Derme]]
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[[ms:Lapisan dermis]]
 
[[nl:Dermis]]
 
[[nl:Dermis]]
 
[[pt:Derme]]
 
[[pt:Derme]]
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[[fi:Verinahka]]
 
[[fi:Verinahka]]
 
[[sv:Läderhuden]]
 
[[sv:Läderhuden]]
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[[th:หนังแท้]]

Revision as of 22:43, 7 February 2008

Dermis
Gray942.png
The distribution of the bloodvessels in the skin of the sole of the foot. (Corium - TA alternate term for dermis - is labeled at upper right.)
Gray940.png
A diagrammatic sectional view of the skin (magnified). (Dermis labeled at center right.)
Gray's subject #234 1065
MeSH Dermis
Dorlands/Elsevier d_11/12289496

The dermis is a layer of skin beneath the epidermis that consists of connective tissue, and cushions the body from stress and strain.The dermis is the lower layer of skin; contains main blood vessels. The dermis is tightly connected to the epidermis by a basement membrane, and harbors many nerve endings that provide the sense of touch and heat. It contains the hair follicles, sweat glands, sebaceous glands, apocrine glands, and blood vessels. The blood vessels in the dermis provide nourishment and waste removal to its own cells, as well as the Stratum basale of the epidermis.

Structure

The dermis is structurally divided into two areas: a superficial area adjacent to the epidermis, called the papillary region, and a deep thicker area known as the reticular region.

Papillary region

The papillary region is composed of loose areolar connective tissue. It is named for its fingerlike projections called papillae, which extend toward the epidermis. The papillae provide the dermis with a "bumpy" surface that interdigitates with the epidermis, strengthening the connection between the two layers of skin.

In the palms, fingers, soles, and toes, the influence of the papillae projecting into the epidermis forms contours in the skin's surface. These are called friction ridges, because they help the hand or foot to grasp by increasing friction. Friction ridges occur in patterns (see fingerprint) that are genetically determined and are therefore unique to the individual, making it possible to use fingerprints or footprints as a means of identification.

Reticular region

The reticular region lies deep to the papillary region and is usually much thicker. It is composed of dense irregular connective tissue, and receives its name from the dense concentration of collagenous, elastic, and reticular fibers that weave throughout it. These protein fibers give the dermis its properties of strength, extensibility, and elasticity.

Located within the reticular region are also the hair roots, sebaceous glands, sweat glands, receptors, nails, and blood vessels.


Tattoo ink is injected into the dermis. Stretch marks are also located in the dermis.

Additional images

External links

bg:Дерма ca:Dermis cs:Škára de:Dermis eo:Dermo ms:Lapisan dermis nl:Dermis sk:Zamša fi:Verinahka sv:Läderhuden th:หนังแท้


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