The study of the development of an embryo from fertilisation through to description as a foetus.

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Development of vitreous humor

I have tried reading about development of vitreous humor but it is all very confusing. When does it first developed ? Does it renew itself ? Please provide reliable sources..
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Cytoplasmic determinants - protostomes and deuterostomes

Cytoplasmic determinants are spread unevenly in the egg, and so when embryo starts forming (cells start dividing), the determinants are also unequally divided between cell. This unequal distribution ...
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Is telomere shortening consistant over consecutive cell divisions from zygote to a differentiated cell?

Considering the complexity of embryogenesis, a temporal referance would be helpful to coordinate the developmental sequences during embryogenesis and fetal development which is to be completed within ...
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which exact mechanism triggers the first cell differentiation after n divisions?

I would like to understand which mechanism triggers the first cell differentiation after n divisions. I read previous articles on SE and Wikipedia articles on cellular differentiation and ...
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Cytoplasmic determinants in amphibians

If cytoplasmic determinants are distributed before fertilisation then how can an amphibian's embryo, whose dorsal side is determined after fertilisation develop ?
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Is there a realtime molecular clock within the genome to co-ordinate the developmental sequences in an embryo?

It is difficult to assume that the massive number of co-ordinated developmental sequences in a developing embryo is controlled by molecular signalling alone. Is anyone aware of a molecular or ...
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What are things inside dorsal aorta in germ layers?

I am not sure if they are mesonephros. Mesonephros should be above dorsal aorta, not visible in this picture. What are those cells inside the red shaped circle?
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Does dark blastomere precede embryoblast?

I am thinking the stage from morula into blastocyst where the Zona pellucida dissolves and develops a cellular ring (trophoblast) around the blastocyst. Does dark plastomere develop into ...
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What is CT of tertiary villus in placental barrier?

Context Placental barrier consists of CT of the tertiary villi. It something Chorionic ... I think it cannot be cytotrophoblast because it does not have tertiary villus. If it was, it would ...
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Does maternal part of placenta have tertiary villus?

I am thinking between these two definitions Maternal placenta = decidua basalis + placental septas and Maternal placenta = decidua basalis + tertiary villus I think placental septas do ...
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To show smooth chorion and villous chorion from these pictures

Can you see smooth chorion and/or villous chorion in the pictures below? I am trying to visualise them. Some definitions: Smooth chorion = Chorion leave. Villous chorion = Chorion frondosum. ...
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To visualise the embryonic development of skeleton and muscles?

I am trying to find a visualisation for this topic, preferably a video. Some facts which I would like to have in the video(s)/visualisation Ossification starts usually with 3 primary centers: 1 ...