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G7: Stomach and lesser sac in mesentery. Triangular flange of mesentery with triangular hole and intervitelline anastomosis. Hindgut (without lumen) seen at caudal end of mesentery.
G7: Cervical region: dark masses of dorsal root ganglia. Lumbar region: dorsal aorta with its dorsal segmental arterial branches. Between each dorsal segmental artery is a darker-staining mass of mesenchyme (the dark part of a sclerotome) which is the anlage of the intervertebral disc. The dorsal segmenta lartery itself marks the location of the centre of the light-staining part of the sclerotome, which is the future vertebral body. The dark band dorsal to the sclerotomes is the basal lamina of the wall of the neural tube.
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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