Interactive CS16 Embryo Model


        Key to anatomical regions

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

Movies of CS16 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.


N346 46XX
N376 46XX
N426 46XX


N519 46XY
N709 46XX
N1323 46XX


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

1716 46XY
1815 46XY




Painted Anatomical Regions


The movies below show anatomical domains defined in the N346 model. The domains have been manually defined in the OPT model 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 - cyan.


N346 46XX



Carnegie Stage 16 Definition



a 3D model of a human embryo, Carnegie stage 16


Age is approximately 38 postovulatory days

Length is approximately 7 - 12 mm

External Features Include: retinal pigment becoming visible externally; the thigh, leg and foot are becoming distinguishable; pharyngeal arch 2 is more massive and more conspicuous (whereas arch 3 is receding from the surface); auricular hillocks are beginning to appear.

O'Rahilly R and Muller F [1987] Developmental Stages in Human Embryos. Carnegie Institute, Washington, Publication no. 637, and O'Rahilly R, Müller F (2010) Developmental stages in human embryos: revised and new measurements. Cells Tissues Organs. 192:73-84. PMID: 20185898.