1. 4th ventricle
2. Branchial arches
3. Diencephalon
4. Dorsal aorta
5. Infundibular recess
6. Lung bud
7. Mesencephalon
8. Optic cup
9. Optic stalk
10. Rhombencephalon
11. Sinus venosus
12. Somites
13. Spinal cord
14. Spinal nerves
15. Telencephalon
16. Truncus arteriosus

Technique: Paraffin section
Staining: Hematoxylin-eosin Orientation: Longitudinal section Developmental age: 4-5 weeks Magnification (objective): x 10