K12 Week 4: Difference between revisions

Revision as of 00:39, 24 March 2011

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

width=480px|height=500px|controller=true|autoplay=false</qt>

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

View - Back of the whole early embryo and yolk sac (large ball shape to the left) and head to top and tail to bottom.

The movie also shows as the embryo grows and folds it increases in size relative to the initial 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

@@ Line 3: / Line 3: @@
 In week four of embryo development organs begin to form within the embryo and surface features begin to form.
+{| border='0px'
+|-
-Embryo at 4 weeks (Carnegie stage 13)
+| <qt>file=Neuraltube_001.mov‎|width=480px|height=500px|controller=true|autoplay=false</qt>
+| valign="top" |This movie of early embryo development from week 3 onward shows the early nervous system forming.
-* On the embryo surface limb buds and special sensoryregions on and near the embryo head appear.
+'''View''' - Back of the whole early embryo and yolk sac (large ball shape to the left) and head to top and tail to bottom.
-* 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.
+The movie also shows as the embryo grows and folds it increases in size relative to the initial yolk sac.
-* 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.
+==Embryo at 4 weeks==
+(Carnegie stage 13)
+[[File:Stage13_sem1b.jpg]]
+* On the embryo surface limb buds can be seen where the future arms and legs will form.
-Question: Do all animals have eyes, ears and noses?
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 [[Category:K12]]