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Sumario HISTOLOGÍA DE DIGESTIVO $8.49   Add to cart

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Sumario HISTOLOGÍA DE DIGESTIVO

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Resumen de Histología sobre Sistema digestivo

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  • March 30, 2024
  • 4
  • 2020/2021
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Capas d TUBO DIG:
Histo Digestivo II
→ Mucosa: → “D” product d somatostanina: en todo tracto dig. inmunohqca
-Epitelio d revestimiento c lámina basal → “S” product d secretinas: + parte prox d ID
-Lámina própia d TC → “I” product d colecistocinina: + porción prox d ID
-Muscular d Mucosa → “K” product d Péptido inhibidor gástrico: porcion prox d ID
→ Submucosa: → “L” product d enteroglucagón
-TC denso no modelado → “N” product d neurotensina
-Plexo d meinsner → “MO” product d motilina
→ cel. Madre: en criptas d L. Entre estas cel madre en prolif
→ Muscular Externa: -unas migran partes + prof → cel d Paneth
-Circular interna (espiral apretada) -o van parte sup → enterocito y cel calciformes, viven 3-5 días xq
-Longitudial externa (espiral laxa) cuando llegan sufren apoptosis
-Plexo d Auerbach
LÁMINA PRÓPIA
→ Serosa o Adventicia TC reticular laxo c cel. S extiende como
nucleo d TC hasta parte sup d vellosidad
AUMENTAN SUPERFICIE ABSORTIVA entre criptas d L.
→ Pliegues circulares (yeyuno)→ Folículos Solitarios: formados x linfocitos q
→ Vellosidades aumentan en ileon y forman Placas d
→ Microvellosidades Pleyer son + d 50, en craa opuesta
DUODENO: glandulas en submucosa mesenterio.
YEYUNO: pliegues
ILEÓN: conglomerados d placas d peyer GALT (cel M, Placas d peyer, nodulos
linfáticos, linfocitos)
INTESTINO DELGADO
MUCOSA
Vellosidad.: núcleo d lamina propia (TC laxo) LÁMINA MUSCULAR DE LA MUCOSA
cubierto x epitelio. d Capa circular int salen haces finos y forman haz long en parte
central hacia Long Externa.
Kriptas d Liberkühn: gland tubulares simples
entre vellosidades.HE SUBMUCOSA
TC laxo, cel Ganglionares d Plexo d Meinssner (solo c gland en
Epitelio: mucosa cubierta x ep simple cilindrio c duodeno)
6 celulas: Gland d Brunner: empiezan en piloro, + desarrolladas duodeno.
Son adenomeros tubulares ramifcadas c cel mucosas c nucleo
→ Enterocitos: absortivas, cilindricas, núcleo ovoide y basal. aplanados basales, q secretan moco, cismógeno y bicarbonato.
Superficie d borde cepillo. Citoplasma eosinofilo. Criptas Cond excretores d epitelio simple cilindrico desembocan en
secretora. Fils d Actina, muchas mitocondrias y REL desarrollado. criptas d L.
Unión yuxtaluminales y zonulae occludens. Algunas pueden ser
solo absortivas (cúmulos d grasa) y otras solo secretoras MUSCULAR EXTERNA
formada x circular int y long ext separad x TC c plexo mientérico
→ Calciformes: entre absortivas y mucina,forma capa q s d Auerbach. Entre capas musc red d cel ramificadas cel
adhiere a membrana mucosa y la protege. PAS insterticiales d Cajal q dirigen freq y direccion d contracciones

→ C. d Paneth: en fondo d criptas d Liberkühn en duodeono.
Piramidales c nucleo basal y gránulos d secreción eosinofilos SEROSA
(defensinas y Lisozima). x meostelio y c subserosa subyacente y
red d fibras elasticas debajo d
→ cel “M”: macrofagos en Placa d Peyer membrana basal d cel mesoteliales.
→ Enteroendócrinas: c gránulos basales. Son
+ duodeno y yeyiuno; – en ileon y colon.

→ Enterocromafines: en todo trato dig y contienen serotonina.

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