Let me try to give a picture of my understanding of neuritic and synaptic growth and their interplay.
Pick two neurons in corresponding areas of opposite hemispheres which are connected by a synapse (and a rather long axon).
Both neurons were originally born at approximately the same time t during brain development in a given distance d, without already having neurites.
They necessarily have a latest common ancestor (stem cell), which doesn't have to be the same parent cell, but maybe the same grandmother or great-grandmother cell.
Now several processes start with different delays and at different speeds:
the two neurons wander away from each other
they specialize thus expressing specific "markers" on their membranes
their axons grow
their dendritic trees grow
Case 1: If neuritic growth is fast enough, the two neurons can meet and build a synapse early (recognizing each other by markers they have in common due to their common ancestor). While wandering away from each other, the neurites have to grow accordingly.
Case 2: If neuritic growth is too slow, and the neurons wander away from each other too fast, the growth of axons and dendrites at least has to be guided somehow (by glia cells or by molecule gradients?) such that later they have a chance to find each other. Finally they recognize each other by markers expressed eventually during specialization.
I could imagine that both cases do occur purely, but even that they can be somehow intermingled.
Question: Is this picture essentially correct or flawed? (A yes/no answer would suffice!)
Furthermore, I am looking for a concise presentation of (resp. gentle introduction to) these processes (and maybe others?) and their interplay that lead to specific synaptogenesis.