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a.1.(Anat.) Situated in front of the notochord; - applied especially to parts of the cartilaginous rudiments in the base of the skull.
References in periodicals archive ?
This organizer is constructed through several successive steps: initially, the endodermal organizer -Nieuwkoop center sends signals to specific cells of the dorsal marginal zone into prechordal head mesoderm.
Finally, the scientists determined that a nearby piece of the embryo, the prechordal mesoderm, induces the single region to split.
The middle of this region gets turned off, or suppressed, from eye formation," says Rao, noting that when the prechordal mesoderm is removed from a developing chick or frog embryo, a single eye forms.