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This membrane is made up of a bladderlike median ventral diverticulum of the hindgut endoderm, covered with splanchnic mesoderm. It connects with the hindgut, which will be found only in sections posterior to the posterior intestinal portal at this stage of development. Ultimately, this double membrane will fill the exocoel, and its outer layer of mesoderm will fuse with mesoderm of the chorion and the aminion and finally with the splanchnic mesoderm of the yolk sac splanchnopleure.

Its function in the chick is related to respiration and excretion. The entire outer covering of the chick embryo is of ectodermal origin and is made up largely of squamous epithelium but will later also include horny scales, feather germs, quills and barbs, claws, beak coverings, and a temporary eggtooth. By evaginations from the surface, the linings of the following structures are also derived from ectoderm: the mouth (stomodeal portion and stomodeal hypophysis); cloaca (proctodeal portion); visceral clefts (peripheral halves); nostrils; eye chamber and lens; otic vesicles; and external auditory meatus.

Cross section in 16 hour chick embryo through hensen node. Cross section in 20 hour chick embryo through hensen node.

Contents • • • • • • • • Introduction Historically, an important way of teaching embryology is by direct observation of histological sections at different stages of development. Even today the best way to observe anatomical development and relationships is by direct observation in serial sections through the embryo and fetus. The sections below are from the original teaching set prepared at UNSW that were digitized and put online in 1996 as a teaching resource.

The Stage 13 and 22 images are available in at least two formats, an unlabeled set (image 1 - 49) and a labeled set (image 50 - 98) in a rostro-caudal sequence (head to tail). Stage 22 embryo also has a set of selected images showing more detail of some organ and tissue development. In addition, there are now 3D animations based upon reconstruction of the embryos from these serial sections. 2011 - Selected slides are currently being rescanned at to show specific developmental details. Author Comments Start here by looking through the early (week 4) embryo (stage 13) labeled images. It is not so important to identify every single feature, observe what structures are present and where they are in the middle of the embryonic period (week 4). Then if you like, look through the unlabeled images.

What can you now recognise? Next look through the late (week 8) embryo (stage 22) labeled images as you did before. Then look through the same embryo stage selected labeled images. These show organ and tissue development of specific structures by the end of the embryonic period. What has changed? Finally put the systems together by watching the embryo animations based upon these sections.

How different are the embryonic systems to the adult anatomy? More about these. Links: Carnegie Stage 13 About Stage 13 Embryo Sections - This image is from a serial section of a 6mm CRL pig embryo with some features of the Stage 14 embryo. This embryo is approximately equal to the day 42 human embryo. Use these serial images to identify internal features and relationships that exist within the embryo at this stage.

Then compare these images with the later features of the Carnegie stage 22 human embryo. Free vray sketchup pro 8 crack download 2016 free and torrent 2016 full.