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Histología, Epitelio

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Epitelios, Revestimiento, morfología, clasificaciones especiales, endotelio, endocardio, mesotelio.

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HISTOLOGÍA.
Todos los órganos del cuerpo están estructurados por la combinación de cuatro
tipos de tejidos básicos: Epitelial, Conectivo o Conjuntivo, Muscular, Nervioso.



CAPÍTULO 1: EPITELIO


Conjunto de células
estrechamente unidas y que
forman un revestimiento
sobre la superficie de un
órgano o formando un
revestimiento. Originado de
las tres capas germinativas;
existe un íntimo contacto
celular (cohesión),
polarización celular
(ubicación del núcleo),
amplio rango de
especialización, poco
espacio intercelular,
separado por el tejido
subyacente por LÁMINA
BASAL unida por diferentes Ilustración 1 Diagrama de epitelio, donde destacan la
uniones, son avasculares. superficie apical, lateral y basal, además de la lámina basal y
reticular
Debido a que el tejido
epitelial es avascular, éste obtiene sus nutrientes y oxígeno del tejido conectivo
adyacente, que si presenta vascularizaciones. Las funciones que destacan son:
protección, secreción, transporte y absorción.

, EPITELIO DE REVESTIMIENTO
Se presentan como hojas epiteliales que revisten el cuerpo, encontramos
revestimiento interno (endotelio) y externo (epidermis).




Ilustración 2 Epitelio de Revestimiento en donde se puede observar el endotelio y la epidermis




La DESCRIPCIÓN de los epitelios de revestimiento se da de acuerdo con:


Morfología Plano o escamoso, Cúbico o Cilíndrico


Número de Capas
celulares que lo Simple o Estratificado
conforman


Presencia de estructuras
diferenciales
Cilios, Estereocilios, Microvellosidades, Flagelos


Clasificación
Especial Pseudoestratificado y Transicional.

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Uploaded on
January 15, 2023
Number of pages
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Written in
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Dilan garcés
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