Ectoderm

... on "cephalization." Sensory and processing cells probably started on the surface (which is probably why even internal systems start as ectoderm) with deeper semi-coordinated connections, as in nerve nets. Better interactions and some under-the-surface protection all would have been ...

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Generally, in animal including: zygot (fertilized cell) - 2 cells - 4 cells - ... - morulla (32 cells) - blastula (ectoderm, entoderm) - gastrula (ectoderm, mesoderm, entoderm) - differentiation stage. I am not sure in plant.

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hypothalamus is derived from ectoderm...it functions both to maintain homeostasis andand secrete neurohormones like ADH(vassopressin) and oxytocin......so one may consider it under the category of glands though it secretes releasing factors ...

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... that their body wall consists of two layers or called as diploblastic , i.e. the endoderm (sometimes referred to as the gastrodermis ) and the ectoderm or the epidermis . Between the two cell layers is the mesoglea , which ranges from little more than a glue to bind the both layers.

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I think it's ectoderm, mesoderm and endoderm with a d. From endo-at the inside

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