A dorsally concave bend of the embryonic rhombencephalon that produces a thinning of the roof of the pons and medulla oblongata and defines the boundary between the metencephalon and myelencephalon in the embryo[MP]. [ MP:0000844 ]

Synonyms: transverse rhombencephalic flexure (embryonic) hindbrain flexure pontal flexure basicranial flexure

This is just here as a test because I lose it