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Making connections

Brain cells have to connect up with other brain cells, to form circuits. The neurones wiring up the brain and nervous system to other parts of the body also have to make connections. Connections between nerve cells, or between nerve cells and their targets are called synapses. Once the brain is able communicate with the rest of the embryo, the muscles can move and the senses can send information back to the brain.

The brain must develop billions of connections: every green dot is a junction between one nerve and another.
The brain must develop billions of connections: every green dot is a junction between one nerve and another.
David Becker/Wellcome Photo Library

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