An intermediate stage (between the neural plate and neural rod) during the early segmentation period in the morphogenesis of the central nervous system primordium; the keel is roughly triangular shaped in cross section. Kimmel et al, 1995.[TAO]

uberon

presumptive central nervous system

UBERON:0007135

• neural rod

• posterior neural keel
• anterior neural keel
• midbrain hindbrain boundary neural keel