B6: Note the ventral compression of the pharynx into a plate and the dense mesenchyme laterally. Two atria and midline truncus arteriosus of heart. Thick nasal placode.
Development of Respiratory
B6: Further compression of ventral part of pharynx to form a fused epithelial lamina - the anlage of the vocal fold. Note surrounding dense mesenchyme. Nasal placode.
B6: Hyaloid vessels ventral to optic stalk. Optic mesenchyme (mesectoderm) arising directly from epithelium of dorsal surface of optic cup. Nasal placodes.
The Carnegie stage 13/14 Pig Embryo is 6mm in size and approximately equal to day 42 Human Embryo. Use the serial images to identify internal features and relationships that exist within the embryo at this stage. Then compare these images with the external appearance of the embryo at this stage and the later internal features of the stage 22 embryo.
Note that the nomenclature "stage 13/14" is not an actual Carnegie stage but indicates that the embryo stage lies between or has features of both stage 13 and stage 14 embryos.
Levels shown on whole embryo are only approximate.
Note that not all embryo features are labelled.
Hint: clicking on each section image above will also step you through the whole embryo in sequence.