Hensen's node

(redirected from Primitive knot)
Also found in: Dictionary, Thesaurus, Medical, Legal, Wikipedia.
Related to Primitive knot: Primitive groove, primitive streak, Primitive pit

Hensen's node

[′hen·səns ‚nōd]
(embryology)
Thickening formed by a group of cells at the anterior end of the primitive streak in vertebrate gastrulas.