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B1: Division of 1st arch into mandibular and maxillary components on one side (undivided on other side due to alignment of embryo at sectioning). Dorsal portion of hypopharyngeal hypo-branchial) eminence. Prominent 3rd arch artery, dorsal aortae. Rathke's pouch (derived from ectoderm anterior to the buccopharyngeal membrane) (see Endocrine- Pituitary Development). prosencephalon. Note thin pharyngeal pouch/groove membranes.
B1-7: Forebrain.
B1:Developing diencephalon. Rathke's pouch. Lens pit (derived from thickened ectoderm of lens or "optic" placode).
B1: Optic nerve. Note extensive temporal region of retina. Anlagen of nasolacrimal ducts.
A7,B1: 1st pharyngeal pouch opening into pharynx.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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