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Sumario sistema endocrino I

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clase de la SO II 15 y 16

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  • May 27, 2024
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¡Bienvenidos!
[Formación embriológica del sistem
endocrino.
Diferenciación histológica de las glán
endocrinas]
Semana Nº 9

SISTEMAS y ORGANOS II

Docente Dr. Erlan Omar Santos Gonz
MEDICINA HUMANA

,3. Desarrollo del tema
Tiroides
La glándula tiroides aparece a manera de proliferación epitelial en el
piso de la faringe, entre el tubérculo impar y la cúpula, en un sitio más
tarde indicado por el foramen ciego (Figs. 17-17 y 17-18 A). De manera
subsecuente, la tiroides desciende por delante del intestino faríngeo
como un divertículo bilobulado (Fig.17-18).

Durante esta migración la tiroides permanece conectada con la lengua
por medio de un conducto estrecho, el conducto tirogloso, que
desaparece posteriormente.

, Tiroides
Al avanzar el desarrollo, la glándula tiroides desciende por delante del
hueso hioides y los cartílagos laríngeos.

Alcanza su posición final frente a la tráquea en la séptima semana
(Fig. 17-18 B). Para ese momento, ha desarrollado un pequeño istmo en
la línea media y dos lóbulos laterales.

La tiroides comienza a funcionar casi al final del tercer mes, momento
en el cual se visualizan los primeros folículos que contienen coloide.

, Tiroides
Las células foliculares producen el coloide que sirve como fuente de
tiroxina y triyodotironina.

Las células parafoliculares, o células C, que derivan del cuerpo
ultimobranquial (Fig. 17-10), son la fuente de la Calcitonina.

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