questions in embryology

[james bond]

When the sex of the fetus get determined ?

when the embryo's ear starts to shape ?

When the embryo is capable hearing ?

when the embryo's eyes start to shape ?

When the embryo is capable seeing ?

when the embryo's bones start to shape ?

when the embryo's skin starts to shape ?

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i need the answers in (days) not in weeks

like embryo's bones start to shape in the day 13

not in week 2 -just an example-

[Strange]

For what species?

[james bond]

For what species?

human

[Strange]

Google!

 

A baby’s sex is determined at the time of conception.

 

http://www.pennmedicine.org/encyclopedia/em_DisplayAnimation.aspx?gcid=000110&ptid=17

 

 

The first part of the ear to develop is the inner ear.^[6] Its appearance occurs around the 22nd day of the embryo’s development

http://en.wikipedia.org/wiki/Development_of_the_ears

 

 

Working with 400 fetuses, researchers in Belfast beamed a pure pulse sound at 250-500 Hz and found behavioral responses at 16 weeks g.a.--clearly seen via ultrasound (Shahidullah and Hepper, 1992). This is especially significant because reactive listening begins eight weeks before the ear is structurally complete at about 24 weeks.

https://birthpsychology.com/free-article/fetal-senses-classical-view

 

The eye begins to develop as a pair of optic vesicles on each side of the forebrain at the end of the 4th week of pregnancy.

 

http://en.wikipedia.org/wiki/Eye_development

 

Although testing eyesight in the womb has not been feasible, we can learn from testing premature babies. When tested from 28 to 34 weeks g.a. for visual focus and horizontal and vertical tracking, they usually show these abilities by 31-32 weeks g.a. Abilities increase rapidly with experience so that by 33-34 weeks g.a., both tracking in all directions as well as visual attention equals that of babies of 40 weeks g.a.

 

https://birthpsychology.com/free-article/fetal-senses-classical-view

 

Bones: tricky because there are different sorts of bones that develop in different ways: http://discovery.lifemapsc.com/in-vivo-development/bone

 

But:

 

The skeleton of the fetus begins developing bones about 13 weeks following conception. The bones gradually become harder and muscle tissue begins to develop. At birth, a newborn's body has approximately 300 bones. Over time, these bones grow together to form the 206 bones in adults.

http://www.livestrong.com/article/36711-bone-development-during-fetal-development/

 

 

Skin — the body’s largest organ — first starts to emerge between week 5 and week 8. At this point, your baby’s epidermis (i.e., skin) consists only of two layers: basal cells (the inner layer of cells) and periderm cells (the outer layer of cells). Hair begins developing immediately after skin, with initial hair buds sewing their seeds after just 8 weeks.

http://www.whattoexpect.com/pregnancy/fetal-hair-skin-nails/

i need the answers in (days) not in weeks

 

Can you multiply by 7?

 

Note that these are gradual and variable processes, so probably can't be pinned down to a single day.

[james bond]

Google!

 

http://www.pennmedicine.org/encyclopedia/em_DisplayAnimation.aspx?gcid=000110&ptid=17

 

http://en.wikipedia.org/wiki/Development_of_the_ears

 

https://birthpsychology.com/free-article/fetal-senses-classical-view

 

http://en.wikipedia.org/wiki/Eye_development

 

https://birthpsychology.com/free-article/fetal-senses-classical-view

 

Bones: tricky because there are different sorts of bones that develop in different ways: http://discovery.lifemapsc.com/in-vivo-development/bone

 

But:

http://www.livestrong.com/article/36711-bone-development-during-fetal-development/

 

http://www.whattoexpect.com/pregnancy/fetal-hair-skin-nails/

 

Can you multiply by 7?

 

Note that these are gradual and variable processes, so probably can't be pinned down to a single day.

 

 

sorry for the late response

now.. i need to know when the eyes be completely shaped.. when fetus's eyes be able to see

when the ears be completely shaped.. and the fetus be able to see ?? ...bones&skin when it be completely shaped?

is there researches explain the development stages of each organ ? minutely

Edited April 27, 2015 by james bond

[Strange]

These questions are all answered in the links I provided. If you are too lazy to read them there is not much I can do ...

[james bond]

These questions are all answered in the links I provided. If you are too lazy to read them there is not much I can do ...

when the middle ear start shaping & when the External ear end shaping

sorry but my english is bad

is the shemale a woman or a male ??is she has XX cromosome but male organs or it is a man look like women ??when and what determine the fetus to be a shemale??

Edited May 13, 2015 by james bond