K12 Week 4: Difference between revisions

Latest revision as of 09:12, 6 November 2018

In week four of embryo development organs begin to form within the embryo and surface features begin to form.

<html5media height="480" width="480">File:Neuraltube_001.mp4</html5media>

This movie of early embryo development from week 3 onward shows the early nervous system forming.

Embryo (right) back view with head to top (left) and tail to bottom (right).

yolk sac (left, large ball shape)

The movie also shows as the embryo grows and folds it increases in size compared to the yolk sac.

(Carnegie stage 13)

On the embryo surface limb buds can be seen where the future arms and legs will form.

Cite this page: Hill, M.A. (2024, April 25) Embryology K12 Week 4. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/K12_Week_4

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 In week four of embryo development organs begin to form within the embryo and surface features begin to form.
+{| border='0px'
+|-
+| width=500px|<html5media height="480" width="480">File:Neuraltube_001.mp4</html5media>
+| valign="top" |This movie of early embryo development from week 3 onward shows the early nervous system forming.
-Embryo at 4 weeks (Carnegie stage 13)
+Embryo (right) back view with head to top (left) and tail to bottom (right).
-* On the embryo surface limb buds and special sensoryregions on and near the embryo head appear.
+yolk sac (left, large ball shape)
-* Sensory placodes will form parts of the ear, eye and nose.
-* Limb buds first form from 2 layers of the embryo are the "paddle-like" projections from the body. The arms appear before the legs.
-* This period of organ development continues to 8 weeks of development.
-* Folding of the embryo continues and the earliest functioning organ is the heart.
-* Other systems such as the blood vessels, gut and nervous system are beginning to all take shape.
-Question: Do all animals have eyes, ears and noses?
+The movie also shows as the embryo grows and folds it increases in size compared to the yolk sac.
+|}
+{{K12}}
+==Embryo at 4 weeks==
+[[File:Stage13 surface bulges.jpg|thumb]]
+(Carnegie stage 13)
+[[File:Stage13_sem1b.jpg]]
+* On the embryo surface limb buds can be seen where the future arms and legs will form.
+{{K12}}
 {{Footer}}
 [[Category:K12]]