expo sentidos
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SENTIDOSAudición y visión
HistologíaDr. Luis Fernando Tenorio VillalvazoJaime Rafael Gutiérrez Pérez
Facultad de MedicinaUniversidad Veracruzana
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Sentido del Oído
Oído Externo
Oído MedioOído
Interno
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Membrana Timpánica Ep. Plano Estratificado
Tejido Fibrocolageno Ep. Cubico Bajo
Huesecillos. Hueso compacto cubiertos de Ep. Cubico bajo en todo el oido medio
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Oído interno
Laberinto membranoso
Laberinto óseo
Conducto coclear Sáculo Utrículo Conductos
semicirculares Saco y conducto
endolinfatico
Vestíbulo Conducto semicircular Conducto coclear
Periostio Perilinfa
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Mecanoreceptores del oído
Células ciliadasEp. EspecializadoEstereocilios en órgano
Inclino Altas despolarizoBajas hiperpolarizaAxones neuronales
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Laberinto membranoso
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Sonido y CortiConducto coclear
2 ¾ giro
Divertículo tubular fondo ciego
Vestibular timpánica- perilinfa
C:Coclear- endolinfa
Epiteliales de sostén
Ciliadas especializadas
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Externo Altas delgadas 3-5 filas paralelas Rodeadas solo en el vértice
Interno Redondeado Una sola fila Completamente rodeadas
Células ciliadas
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Macula Células ciliadas de la macula utricular y
la macula sacular detectan la gravedad y posición estática
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Región ampular del conducto semicircular
Aceleración y movimiento son detectados en c. ciliadas de las ampollas en un extremo de los conductos semicirculares
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Sentido de la Vista
Esclerótica Cornea Úvea Retina
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Esclerótica 1 mm a 0.5 mm Lamina colágenodif. Direcciones. Paralelas a la superficie
Episclera Estroma Porción interna
Limbo 1mm Cornea
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Cornea 10.5 mm  11.5 à Epitelio Corneal :Ep.
Escamoso no K Membrana de Bowman:
Fibras colágenas Estroma Corneal: Laminas de
colágeno paralelas, corneales. Queratocitos
Membrana de Descemet, hialina producto de celulas endoteliales
Endotelio Corneal: células poligonales, en forma de laminas, sup interna de la cornea.
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Uvea Coroides Cuerpo ciliar Iris
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Coroides tiene 3 capas De la Ora serrata a Nervio óptico Contiene vasos sanguíneos y linfáticos Fusca Esclerotica xxxx-xxxx Retina
Estroma coroideo: Fibrocolageno laxo, melanocitos, linfocitos mastocitos
Capa coriocapilar capas profundas de la retina
Membrana de Bruch: Membrana basal de células endoteliales coriocap. Capa ext. Fib colágenas Capa fibroelastica Capa int. Fib. Colágenas Membrana basal de epitelio pigmentario retina.
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Iris, diafragma delante del cristalino Pupila es una apertura controlada por
musculo liso Membrana limitante anterior: capa
incompleta y fenestrada. Estroma: fibrocolageno laxo,
fibroblastos fusiformes. Capa musculo dilatador iris: celulas
mioepiteliales Epitelio posterior: capa interna
mioepitelial, capa externa gránulos con melanina se continua con la retina
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Limitante anterior
Estroma
Musculo dilatador
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Cuerpo Ciliar, musculo ciliar liso
Pars Plica Pars Plana
Crestas o pliegues 2 mm longitud
2 capas epitelio cilindrico Ext Pigmentada Interna Humor acuoso Fibras suspensorias del
cristalino
Plana posterior 4mm de longitud
Estroma se continua coroides
Pigmentario externo se vuelve la retina
Base de iris
Ora Serrata
Coroides
Estroma vascular, musculo liso, epitelio de cobertura
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Retina
Celulas Epiteliales Pigmentarias Celulas Fotorreceptoras Celulas de sostén retinianas Celulas nerviosas
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Epitelio pigmentario sostiene a las c. fotorreceptoras
En la membrana celular hay de 600 a 1000 pliegues son los Discos Fotorreceptores
Conos Bastones
Discos se mantienen como invaginaciones
Mas gruesos y mas cortos
Segmento cónico Perciben color, en la
fovea
Discos libres Segmento ext
cilindrico Perciben intensidad
luminosa en la periferia de la retina
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Celulas nerviosas
Fotorreceptores.
Bipolares
Ganglionares
HorizontalesAmacrinas
Interplexiformes
Integran las
señales de grupos adyacent
es
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Retina sensorial 9 capas
1. Capa de fotorreceptores2. Membrana limitante externa3. Capa nuclear externa4. Capa plexiforme externa5. Capa nuclear interna6. Capa plexiforme interna7. Capa de celulas ganglionares8. Capa de fibras nerviosas9. Membrana limitante interna
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Desprendimiento de retina
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Cristalino, biconvexo, transparente, 9mm diámetro. 3.5 grosor Capsula externa: colágeno tipo IV
Epitelio cubico Centro formado por celulas
cristalinas
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Compartimentos del ojo Humor vitreo 4 ml Humor acuoso 2 ml por minuto
Cámara posterior
Malla trabecular
Conducto de
Schlem
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Componentes accesorios del ojo Conjuntiva
2 epitelios cilíndrico estratificado se continua con ep. Escamoso aplanado
Por debajo hay tejido fibroconectivo laxo.
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Párpados
Piel Musculo orbicular Tarso Conjuntiva
G. de Meibomio: sebaceo G. de Zeis: sebaceos de pestañas G. de Moll: sudoriparas G. de Krause: lagrimales
accesoria G. de Wolfring lagrimales
accesorias
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Glandulas lagrimales Borde superolateral orbita
drena en el fornix conjuntival 10 pequeños ductos
Cubren el ojo Drenan a través de conductos
lagrimales superior e inferior. Saco lagrimal Cornete inferior Conducto lagrimal superior e
inferior: EPITELIO PLANO ESTRATIFICADO
Saco lagrimal y conducto nasolagrimal: EPITELIO CILINDRICO PSEUDOESTRATIFICADO, RESPIRATORIO
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Gracias por su participación
Jaime Rafael Gutiérrez Pérez