At what stage does a foetus develop a Central Nervous system?

Answer 1

5-6 wks into the pregnancy

How your baby's growing: Deep in your uterus your embryo is growing at a furious pace. At this point he's about the size of a sesame seed, and he looks more like a tiny tadpole than a human. He's now made up of three layers — the ectoderm, mesoderm, and endoderm — that will later form his organs and tissues. The cells are forming for his major organs, including his kidneys and liver, and his neural tube is beginning to develop. This neural tube — from which your baby's brain, spinal cord, nerves, and backbone will sprout — develops in the top layer, called the ectoderm. This layer will also give rise to his skin, hair, nails, mammary and sweat glands, and tooth enamel. His heart and circulatory system begin to form in the middle layer, or mesoderm. (This week, in fact, his tiny heart begins to divide into chambers and beat and pump blood.) The mesoderm will also form your baby's muscles, cartilage, bone, and subcutaneous (under skin) tissue. The third layer, or endoderm, will house his lungs, intestines, and rudimentary urinary system, as well as his thyroid, liver, and pancreas. In the meantime, the primitive placenta and umbilical cord, which deliver nourishment and oxygen to your baby, are already on the job.

Note: Every baby develops a little differently — even in the womb. Our information is designed to give you a general idea of your baby's development

Answer 2

The central nervous system is being developed very early on - in the 1st trimester mostly. It starts within the first few weeks and then during the 1st trimester an enormous amount of neurons are born, migrate to the location they will be, and start specializing into the specific type of neuron they will be. In the 2nd trimester some of this continues and then synapse formation begins in earnest (connecting up the different parts to each other). The forming connections and refining the connectivity continues even after birth and into the 1st year or so.

Answer 3

As far as i am aware a baby is FULLY developed at 12 weeks, they are just a miniature version of themselves and spend the next 6 months just growing. That is why it is vitally important to have a correct diet in the first trimester, as well as taking folic acid supplements and avoiding alcohol, caffeine and smoking. They can move, cry (silently), dream and can feel pain at this stage too. That is why people are so anti-abortion for mums who are over 12 weeks pregnant.

Answer 4

i have no idea but conception pregnancy and birth by dr.miriam stoppard is a really good book to show how a baby developes after conception month by month until you pop!!

Answer 5

i do believe that it is in the first weeks after it was conceived, even before you know that you are pregnant

Answer 6

http://www.nrlc.org/abortion/facts/fetusdevelopment.html

Answer 7

www.babycentre.co.uk