Brain and Spinal Cord

5 weeks, 2 days

1. 4th ventricle

2. pontine flexure

3. cerebellum

4. metencephalon

5. midbrain

6. mesencephalic flexure

7. diencephalon

8. left cerebral hemisphere

9. filum terminale

10. myelencephalon

11. cervical flexure (brain-spinal cord junction)

12. pons

13. spinal cord

14. heart

15. umbilical cord

16. right wrist

17. right hand

18. right cerebral hemisphere

19. liver

All ages referenced to fertilization, not last menstrual period.