The Neural Tube Stage Embryo

• has a head and tail region

• has a dorsal surface and a ventral surface

• has a primitive central nervous system ( the neural tube)

• has a skeletal support rod (notochord located ventral to the neural tube)

• has a primitive gut (archenteron)

Regions of the Neural Tube

Brain:

• Prosencephalon with optic vesicles

• Mesencephalon

• Rhombencephalon

Spinal cord

Regions of the Archenteron

Foregut:

• Oral evagination

• Pharynx

• Liver diverticulum

Midgut

Hindgut