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B5: Ventral ends of mandibular processes, maxillary process on one side and nasal placode on other side. Optic cup connected by optic stalk to wall of forebrain (continuous lumen). Note that pharynx has become compressed laterally (compare B4).
Development of Respiratory
B4: Caudal pharynx compressed dorsoventrally.
B1-7: Forebrain.
B5: Continuity of optic ventricle and single forebrain ventricle via optic stalk. Note proximity of eye to nasal placode (R).
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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