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All Anatomical Compartments > Compartment Card
Primitive Streak >

Primitive Node

The primitive node is an area through which migrating cells are channelled into a rodlike mass of mesenchymal cells called the notochord. It is considered to be the human equivalent of the Spemann-Mangold organizer, the extraordinary inductive dorsal blastopore lip in amphibian embryos. The primitive node develops from day 15 in humans.

The primitive node is also known as Hensen's node in chick and is sometimes referred to in mammals as "the node".
Hensen's node, Spemann-Mangold Organizer
Primitive Node
Multiple Ancestors Single Ancestor No Descendants Develops from Part of Parent