Weitere ähnliche Inhalte Kürzlich hochgeladen (20) La piel2. Generalidades del
Sistema Tegumentario
Se origina a partir del Ectodermo y Mesodermo
embrionario
Representa entre el 6 al 15 % del peso corporal (3-10
kg)
Mide de 1,5 a 2 m² de extensión
2
3. Funciones del
Sistema Tegumentario
Determina la forma del cuerpo
Actúa como barrera (mecánica, química, física, etc.)
Tiene función defensiva y reparativa
Participa en la regulación térmica corporal
Colabora en el equilibrio del agua
Presenta una alta sensorialidad
Secreción y absorción de diversos productos
Organo de comunicación
3
4. Sistema Tegumentario
(Piel y Anexos)
1.- Piel
Epidermis
Dermis
Hipodermis (Tejido Subcutáneo)
2.- Anexos
Receptores nerviosos
Glándulas Sebáceas
Glándulas Sudoríparas
Pelos y folículos
Uña
4
7. Epitelio de revestimiento
Epidermis
•Estratificado
Escamoso keratinizado
Membrana
Basal
Epidermis
Unión Dermo-epidérmica
Dermis
Hipodermis
7
8. Epidermis
Epitelio de revestimiento
•Estratificado escamoso keratinizado
Está constituida por 2 de poblaciones celulares:
1.- Keratinocitos o células formadoras de queratina
2.- No Keratinocitos
8
10. Estratos de la Epidermis
1.- Estrato Córneo:
Queratina
- 10 a 20 capas (piel delgada)
- Sobre 100 capas (piel gruesa)
2.- Estrato Lúcido:
Eleidina
- 5 a 15 capas (sólo piel gruesa)
3.- Estrato Granuloso:
Gránulos de keratohialina
- 1 capa (piel delgada)
- 4 a 12 capas (piel gruesa)
4.- Estrato Espinoso:
- 5 a 7 capas (piel delgada)
- 10 a 14 capas (piel gruesa)
5.- Estrato Basal (germinativo)
- 1 capa
10
12. Pigmentación de la piel:
Eumelanina (melanocitos) = pigmentación oscura
Carotenoides (dermis) = pigmentación amarilla- anaranjada
Oxihemoglobina (vasos sanguíneos) = pigmentación rojiza
12
16. Radiación
Ultravioleta (UV)
UV
C
UV
Capa de Ozono UV B
A
Radiación UV
•Destruye DNA
•Promueve cáncer Epidermis
Membrana Basal
•Producción de
vitamina D Dermis
Hipodermis 16
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