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>D6: Gall bladder. Junction of lesser sac with R coelomic canal.
D6: Spinal cord has enlarged ventral horns (motor neurons).
D6-,D7: Limb folds and fossae. Greatest thickening of the ectoderm is at apex of the limb fold: the apical ectodermal ridge. The mesenchyme of the limb is densest under the ectoderm. Note the narrow distance between the ectoderm of the axillary fossa and the serosa of the body cavity. The limb fold has distinct flexor and extensor surfaces: the flexor surface is narrower and has thicker ectoderm. Note blood vessels close to flexor surface
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.
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