Primitive brain (embryogenesis)
Areas seen at week 4: midbrain, hindbrain and forebrain. By neurogenesis, differentiation and migration of cells from the neural tube.
Cranial caudal orientation
Head to tail orientation. Arises at week 4
The eye
Through ectoderm, start at week 6, at 8 it’s developed
Ear
week 5-8 . From groove to inner ear.
Complete human, organogenesis finished
Week 8