Description

This 3D model was generated based on segmentation of the stage 23 embryo from the Virtual Human Embryo Project. Details about this embryo, images, and further information can be found here: Virtual Human Embryo Stage (https://www.ehd.org/virtual-human-embryo/stage.php?stage=23)14 (https://www.ehd.org/virtual-human-embryo/stage.php?stage=14) The description provided for the embryo is as follows: Stage 14 embryos have a greatest length of 5 to 7 mm and an estimated postfertilization age of 33 days. The optic cup and lens pit are present and the endolymphatic duct begins. The stage is represented by Carnegie embryo #6502 that has a grade of excellent. It has an estimated greatest length of 6.7 mm (after fixation) and is on the borderline of the next stage. The embryo was prepared for microscopic examination in 1931. It is uncertain what fixative was used for this specimen but it is thought to have been Souza's. It was embedded in celloidin and paraffin and serially sectioned transverse to the long axis at 10 microns. The sections were mounted on 45 large glass slides and stained with hematoxylin and eosin. Silver was added later to sides 1 to 25. There are 1109 sections through the embryo.