Primera parte donde se explica de manera resumida el proceso del desarrollo de la cabeza.
Incluye información previa necesaria para comprensión + enlace de YouTube donde se explica el desarrollo de los miembros
, Al principio del desarrollo embrionario, durante la tercera semana después de la
fecundación, el embrión es un organismo plano, con forma de disco, formado por
tres capas de células pluripotentes llamadas capas germinales (hojas embrionarias),
que dan lugar a todos los órganos y tejidos del cuerpo: una capa interna, llamada
endodermo, una capa central, llamada mesodermo, y una capa externa, llamada
ectodermo.
En la cuarta semana de desarrollo, como resultado del plegado del embrión a lo
largo del eje rostrocaudal y del eje lateral, adquiere una forma más reconocible
como "humana” (se parece a una gamba).
En el extremo de la cabeza, el tubo neural se expande enormemente formando el
primitivo cerebro anterior (prosencéfalo*), que produce una protuberancia
conocida como prominencia frontal.
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