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 |
Anatomical terminology |
A graphic representation of the interface between skin epithelium and the underlying connective tissue. Zone B, indicating the region of overlapping projections of epithelium and connective tissue, is the papillary dermis. Zone C, indicating the region of dermis that lies immediately subjacent to the interdigitations of epithelium, is the reticular dermis.
The dermis is a layer of skin between the epidermis (with which it makes up the cutis) and subcutaneous tissues, that consists of connective tissue and cushions the body from stress and strain. It is divided into two layers, the superficial area adjacent to the epidermis called the papillary region and a deep thicker area known as the reticular dermis.[1] The dermis is tightly connected to the epidermis through a basement membrane. Structural components of the dermis are collagen, elastic fibers, and extrafibrillar matrix.[2] It also contains Mechanoreceptors that provide the sense of touch and heat, hair follicles, sweat glands, sebaceous glands, apocrine glands, lymphatic vessels and blood vessels. Those blood vessels provide nourishment and waste removal for both dermal and epidermal cells.
Contents
- 1 Components of the dermis
- 2 Layers
- 2.1 Stratum papillare
- 2.2 Stratum reticulare
- 3 Additional images
- 4 See also
- 5 References
Components of the dermis
The dermis is composed of three major types of cells:[3] fibroblasts, macrophages, and adipocytes.
Apart from these cells, the dermis is also composed of matrix components such as collagen (which provides strength), elastin (which provides elasticity), and extrafibrillar matrix, an extracellular gel-like substance primarily composed of glycosaminoglycans (most notably hyaluronan), proteoglycans, and glycoproteins.[3]
Layers
Stratum papillare
The papillary region is composed of loose areolar connective tissue. This is named for its fingerlike projections called papillae, that extend toward the epidermis and contain either terminal networks of blood capillaries or tactile Meissner's corpuscles.[4]
Stratum reticulare
A fluorescent section of blood vessels in the skin; the smooth muscle walls of the blood vessels are brightly stained.
The reticular region lies under 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. Within the reticular region are the roots of the hair, sebaceous glands, sweat glands, receptors, nails, and blood vessels.
Additional images
-
Epidermis and dermis of human skin.
-
Cross-section of all human skin layers.
-
Illustration of Dermal Circulation
See also
- Dermal papillae
- Skin
- Epidermis
- List of cutaneous conditions
References
- ^ James, William; Berger, Timothy; Elston, Dirk (2005). Andrews' Diseases of the Skin: Clinical Dermatology (10th ed.). Saunders. Pages 1, 11–12. ISBN 0-7216-2921-0.
- ^ Marks, James G; Miller, Jeffery (2006). Lookingbill and Marks' Principles of Dermatology (4th ed.). Elsevier Inc. Page 8–9. ISBN 1-4160-3185-5.
- ^ a b The Ageing Skin - Structure
- ^ http://microvet.arizona.edu/Courses/vsc422/secure/VSC422AppledHistologyLabHandout.pdf
Integumentary system (TA A16, TH H3.12, GA 10.1062)
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Skin |
Epidermis |
- Stratum corneum
- Stratum lucidum
- Stratum granulosum
- Stratum spinosum
- Stratum basale
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Basement membrane zone |
- Basal keratinocyte
- Lamina lucida
- Lamina densa
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Dermis |
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Subcutaneous tissue |
- Panniculus/Pannus (Panniculus adiposus
- Panniculus carnosus)
- Stratum membranosum
- Loose connective tissue
- Superficial fascia
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Adnexa |
Skin glands |
- Sweat glands: Apocrine sweat gland
- Eccrine sweat gland
- Sebaceous
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Hair |
Root sheath |
- Outer root sheath
- Inner root sheath
- Henle's layer
- Huxley's layer
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Hair shaft |
- Cuticle
- Cortex
- Medulla
- Bulb with matrix cells
- Hair follicle
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Muscle |
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Pilosebaceous unit |
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Nail |
- Nail matrix
- Nail plate
- Eponychium
- Paronychium
- Hyponychium
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noco (i/b/d/q/u/r/p/m/k/v/f)/cong/tumr (n/e/d), sysi/epon
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proc, drug (D2/3/4/5/8/11)
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noco/cong/tumr, sysi/epon
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Connective Tissue (TH H2.00.03)
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Physiology |
- Soft tissue
- Fibrosis
- Scarring
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Classification |
Connective tissue proper |
Loose |
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Dense |
- Dense irregular connective tissue
- Dense regular connective tissue
- Ligament
- Tendon
- Aponeurosis
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Embryonic |
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Specialized |
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Composition (Histology) |
Cells |
Resident |
- Fibroblast
- Fibrocyte
- Reticular cell
- Tendon cell
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Wandering
cell |
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Extracellular
matrix
(noncellular) |
Ground substance |
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Fibers |
- Elastic fibers: Elastin
- Fibrillin
- EMILIN1
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See also: Template:Soft tissue tumors and sarcomas
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noco (i/b/d/q/u/r/p/m/k/v/f)/cong/tumr (n/e/d), sysi/epon
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proc, drug (D2/3/4/5/8/11)
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anat (h/n, u, t/d, a/p, l)/phys/devp/hist
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noco (m, s, c)/cong (d)/tumr, sysi/epon, injr
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Routes of administration / Dosage forms
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Oral |
Digestive tract (enteral)
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Solids
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- Pill
- Tablet
- Capsule
- Time release technology
- Osmotic delivery system (OROS)
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Liquids
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- Decoction
- Elixir
- Electuary
- Emulsion
- Extended-release syrup
- Effervescent powder or tablet
- Herbal tea
- Hydrogel
- Molecular encapsulation
- Powder
- Softgel
- Solution
- Suspension
- Syrup
- Syrup Concentrate for dilution and/or addition of carbonated water
- Tincture
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Buccal (Sublabial) Sublingual
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Solids
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- Orally disintegrating tablet (ODT)
- Film
- Lollipop
- Sublingual drops
- Lozenges
- Effervescent buccal tablet
- Chewing gum
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Liquids
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- Mouthwash
- Toothpaste
- Ointment
- Oral spray
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Respiratory
tract
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Solids
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- Smoking device
- Dry powder inhaler (DPI)
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Liquids
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- Anaesthetic vaporizer
- Vaporizer
- Nebulizer
- metered-dose inhaler (MDI)
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Gas
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- Oxygen mask and Nasal cannula
- Oxygen concentrator
- Anaesthetic machine
- Relative analgesia machine
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Ophthalmic /
Otologic / Nasal |
- Nasal spray
- Ear drops
- Eye drops
- Ointment
- Hydrogel
- Nanosphere suspension
- Insufflation
- Mucoadhesive microdisc (microsphere tablet)
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Urogenital |
- Ointment
- Pessary (vaginal suppository)
- Vaginal ring
- Vaginal douche
- Intrauterine device (IUD)
- Extra-amniotic infusion
- Intravesical infusion
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Rectal (enteral) |
- Ointment
- Suppository
- Enema
- Murphy drip
- Nutrient enema
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Dermal |
- Ointment
- Topical cream
- Topical gel
- Liniment
- Paste
- Film
- DMSO drug solution
- Electrophoretic dermal delivery system
- Hydrogel
- Liposomes
- Transfersome vesicles
- Cream
- Lotion
- Lip balm
- Medicated shampoo
- Dermal patch
- Transdermal patch
- Contact (rubbed into break in the skin)
- Transdermal spray
- Jet injector
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Injection / Infusion
(into tissue/blood) |
Skin
|
- Intradermal
- Subcutaneous
- Transdermal implant
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Organs
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- Intracavernous
- Intravitreal
- Intra-articular injection
- Transscleral
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Central nervous system
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- Intracerebral
- Intrathecal
- Epidural
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Circulatory / Musculoskeletal
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- Intravenous
- Intracardiac
- Intramuscular
- Intraosseous
- Intraperitoneal
- Nanocell injection
- Patient-Controlled Analgesia pump
- PIC line
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Routes of administration by organ system
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Gastrointestinal |
- Oral
- Buccal
- Sublabial
- Sublingual
- Rectal
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Respiratory system |
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Visual system /
Auditory system |
- Ocular (Ocular-topical / Intravitreal / Transscleral)
- Otologic (Oto-topical)
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Reproductive system |
- Intracavernous
- Intravaginal
- Intrauterine (Extra-amniotic)
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Urinary system |
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Peritoneum |
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Central nervous system |
- Intracerebral
- Intrathecal
- Epidural
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Circulatory system |
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Musculoskeletal system |
- Intramuscular
- Intraosseous
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Skin |
- Epicutaneous
- Intradermal
- Subcutaneous
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