S1 Fig -

Representative cross-sectional images of the head region of a chick embryo (day 5, embryonic stages HH25-27), counterstained with 1% PTA for 24 h at 40°C (A): coronal (X-Z), transaxial (X-Y) and sagittal (Z-Y) planes and isosurface 3D renderings of the head region (B). The following structures are marked on the images: 1 –telencephalon (lat. telencephalon); 2 –diencephalon (lat. diencephalon); 3 –midbrain (lat. mesencephalon); 4 –hindbrain (lat. rhombencephalon); 5 –medulla oblongata (lat. myelencephalon); 6 –spinal cord (lat. medulla spinalis); 7 –pineal gland (lat. corpus pineale); 8 –pituitary gland (lat. hypophysis); 9 –eyes (lat. oculus); 10 –chiasma and optic nerves (lat. chiasma opticum). Visualization of structures in the DataViewer software and CTvox software.

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