Interactive CS13 Embryo Model


The model is high resolution. Please allow time for it to load.

        Key to anatomical regions

  • Neural tube
  • Optic vesicle
  • Otic vesicle
  • Dorsal root ganglia
  • Heart
  • Liver

Movies of CS13 embryos


The movies below show volume renders of OPT models. No staining has been used on any of the specimens and the images were captured using autofluorescence with a FITC filter.


N383 46XY
N462 46XX


N475 46XY
N489 46XY


The movies below show volume renders of High Resolution Episcopic Microscopy (HREM) models. Other HREM models can be found here.

N1867 46XY
N1941 46XY



Painted Anatomical Regions


The movies below show anatomical domains defined in the N462 and N475 models. The domains have been manually defined in the OPT models using specialised software and then visualised using commercial rendering packages.

The various domains are: neural tube - orange; heart - red; liver - dark green; optic vesicle - dark blue; otic vesicle - yellow; dorsal root ganglia/dermatomes - cyan.


N462 46XX
N475 46XY

Carnegie Stage 13 Definition



a 3D model of a human embryo



Age is approximately 28 postovulatory days

Length is approximately 4-6 mm

External Features Include: all four limb buds are usually visible; otic vesicle is closed; lens disc is generally not indented.

O'Rahilly R and Muller F [1987] Developmental Stages in Human Embryos. Carnegie Institute, Washington, Publication no. 637