Template:Integumentary terms: Difference between revisions

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* '''bulb''' - the hair follicle enlargement located at its deepest end, dividing cells form the hair and the root sheath.
* '''bulb''' - the hair follicle enlargement located at its deepest end, dividing cells form the hair and the root sheath.
* '''columnar''' - cells are longer than they are wide. (More? [[:File:Epithelium histology cartoon 01.jpg|image - cell shapes]])
* '''columnar''' - cells are longer than they are wide. (More? [[:File:Epithelium histology cartoon 01.jpg|image - cell shapes]])
* '''corneocytes''' - terminally differentiated keratinocytes forming the stratum corneum.
* '''cuboidal''' - cells are about the same length and width. (More? [[:File:Epithelium histology cartoon 01.jpg|image - cell shapes]])
* '''cuboidal''' - cells are about the same length and width. (More? [[:File:Epithelium histology cartoon 01.jpg|image - cell shapes]])
* '''cutis''' - alternative term for the epidermis and the dermis layers of the skin.
* '''cutis''' - alternative term for the epidermis and the dermis layers of the skin.
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* '''hypodermis''' -  (subcutis) connective tissue inner layer of the skin that binds it to underlying structures.
* '''hypodermis''' -  (subcutis) connective tissue inner layer of the skin that binds it to underlying structures.
* '''integumentary''' - term for the skin and its appendages.
* '''integumentary''' - term for the skin and its appendages.
* '''involucrin'''  - protein that binds loricrin in the development of the cell envelope protecting corneocytes in the skin.
* '''keratinocyte''' - the main cell type forming the layers of the epidermis, derived from ectoderm.
* '''melanin''' - (Greek, ''melanos'' = black) The pigment produced by [[M#melanocyte|melanocytes]] that provides photoprotection, preventing cellular DNA damage, and colouring of the basal epithelial cells that  absorb the pigment.
* '''melanin''' - (Greek, ''melanos'' = black) The pigment produced by [[M#melanocyte|melanocytes]] that provides photoprotection, preventing cellular DNA damage, and colouring of the basal epithelial cells that  absorb the pigment.
* '''melanodermia''' -  hyperpigmentation causing abnormal darkening (brown/black) of the skin due to excess melanin or by metallic substances. See also the abnormality ceruloderma (blue/grey). (More? PMID 23522626)
* '''melanodermia''' -  hyperpigmentation causing abnormal darkening (brown/black) of the skin due to excess melanin or by metallic substances. See also the abnormality ceruloderma (blue/grey). (More? PMID 23522626)

Revision as of 14:53, 20 September 2016

Integumentary Development

  • apocrine gland - (sweat gland) proteinaceous secretion associated with hair (axilla, areola, genital and anal regions). Additional glands associated with eyelashes are called the glands of Moll (ciliary gland). (More? image - apocrine secretion)
  • arrector pili muscle - bundle of smooth muscle associated with hair follicle, inserts into the papillary layer of the dermis and attaches to the dermal sheath of the hair follicle. (More? image - arrector pili muscle)
  • bulb - the hair follicle enlargement located at its deepest end, dividing cells form the hair and the root sheath.
  • columnar - cells are longer than they are wide. (More? image - cell shapes)
  • corneocytes - terminally differentiated keratinocytes forming the stratum corneum.
  • cuboidal - cells are about the same length and width. (More? image - cell shapes)
  • cutis - alternative term for the epidermis and the dermis layers of the skin.
  • dermal papillae - interdigitation of the dermis with the epidermis.
  • dermis - connective tissue middle layer of the skin, consists of two sublayers (papillary and reticular layers) that do not have a clear boundary. Embryologically derived from the somite dermatome.
  • dermomyotome - Early embryonic dorsolateral half of the somite that will later divide to form both the dermatome and myotome. The dermatome will contribute the dermis and hypodermis of the skin. The myotome will contribute the skeletal muscle of muscoloskeletal system. Development sequence: mesoderm to paraxial mesoderm to somite to "dermomyotome" then dermatome and myotome. (More? Somitogenesis | Musculoskeletal System Development | Integumentary System Development)
  • dermatome - The early embryonic dorsal portion of the somite that will contribute the dermis and hypodermis of the skin. Note in the adult, this term is used to the skin sensory region innervated by a single spinal (nerve) segment. mesoderm - paraxial mesoderm - somite - dermomyotome - dermatome - dermis. (More? image - skin dermatome | Somitogenesis | Musculoskeletal System Development | Integumentary System Development | Neural System Development)
  • epidermis - Histological term describing the external cellular epithelial layer of the integumentary (skin) covering the entire body. This surface layer of keratinocytes is ectoderm in origin, while the underlying connective tissue layers of dermis and hypodermis are mesoderm in origin. (More? Integumentary Development)
  • hair - (pili) in humans consists of vellus and terminal hairs.
  • holocrine - form of gland secretion where the secretory cells eventually lyse (rupture) and are lost. On the skin, these cells release sebum consisting mainly of lipid. (More? image - holocrine secretion)
  • hypodermis - (subcutis) connective tissue inner layer of the skin that binds it to underlying structures.
  • integumentary - term for the skin and its appendages.
  • involucrin - protein that binds loricrin in the development of the cell envelope protecting corneocytes in the skin.
  • keratinocyte - the main cell type forming the layers of the epidermis, derived from ectoderm.
  • melanin - (Greek, melanos = black) The pigment produced by melanocytes that provides photoprotection, preventing cellular DNA damage, and colouring of the basal epithelial cells that absorb the pigment.
  • melanodermia - hyperpigmentation causing abnormal darkening (brown/black) of the skin due to excess melanin or by metallic substances. See also the abnormality ceruloderma (blue/grey). (More? PMID 23522626)
  • melanoblast - (Greek, melanos = black) The neural crest precursor cell that differentiates to form melanocytes located in the skin and other tissues that produces melanin. (More? Neural Crest Development | Integumentary System Development)
  • melanocyte - (Greek, melanos = black) A pigmented cell, neural crest in origin, differentiating from melanoblasts located in the skin and other tissues that produces melanin. The melanocytes within the integument (skin) transfer melanin to keratinocytes to give skin colour and to the hair follicle to give hair colour. Melanocytes are also located within "non-cutaneous" tissues in the eye (for eye colour), harderian gland and inner ear. This is the cell type that proliferates in the cancer melanoma. (More? Neural Crest Development | Integumentary System Development)
  • merkel cell - An epidermal-derived cell in touch-sensitive area of the epidermis and mediate mechanotransduction in the skin. Previously thought to be neural crest in origin, but recently shown to arise from the embryonic epithelium. The cells are named after Friedrich Sigmund Merkel, a German anatomist who was the first to describe them in 1875. (More? Lecture - Integumentary Development | PMID 19786578 | PMID 3782861)
  • merocrine gland - (sweat gland, eccrine sweat) simple tubular glands located at the border between the dermis and hypodermis. These glands regulate the body temperature. (More? image - merocrine secretion)
  • papillary layer - dermis sublayer that appears less dense and contains more cells lying close beneath the epidermis.
  • reticular layer - dermis sublayer that appears denser and contains fewer cells with thick collagen bundles lying parallel to the skin surface.
  • root sheath - cell layers that surround the hair.
  • sebaceous gland - holocrine gland associated with both the hair follicle and hairless parts of the skin (lips, cheek oral surface and external genitalia). Embedded in the dermis and are sites of infections (acne).
  • simple - consisting of a single cell layer.
  • squamous - flattened, used to describe epithelia where the upper cell layer shape is flattened. (More? image - cell shapes | image - squamous epithelium)
  • stratified - consisting of several cell layers. (More? image - stratified epithelium)
  • terminal hairs - hair seen in obviously hairy parts of the body.
  • thick skin - refers to the skin histology found on the palms of the hand and soles of the feet, do not contain hair. Note that this is used as a histological term not a measurement of overall skin thickness.
  • thin skin - refers to the skin histology found on skin in all other regions beside palms and soles.
  • vellus hairs - fine short hairs only lightly pigmented covering the body.
  • vernix caseosa - (vernix, Latin, "caseosa" = cheese-like) a fetal protective coating consisting of sebum, skin cells and lanugo hair. Forming late in fetal development in a rostra-caudal sequence associated with epithelium differentiation.
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