How signals are traveling to the brain from sensory organs. For example when light hits the eyes the excitation of the cones etc , if i'm not mistaken, starts the process of signal transmission through fibers that reach the brain.

 

Do the signals travel by spatially continues chain chemical reactions, or molecules and/or ions travel ? Is it known ?

Yes; the process is known and it begins with retinene, a light sensitive molecule in the rods and cones of the retina. Retinene changes configuration in the presence of light, which generates neural impulses that deliver ocular sensory stimuli into brain structure via the optic nerve. I hope this helps.

How signals are traveling to the brain from sensory organs. For example when light hits the eyes the excitation of the cones etc , if i'm not mistaken, starts the process of signal transmission through fibers that reach the brain.

 

Do the signals travel by spatially continues chain chemical reactions, or molecules and/or ions travel ? Is it known ?

 

 

It is a pretty complex process involving ion exchange reactions to create a voltage across the membrane ...

https://en.wikipedia.org/wiki/Action_potential

Try this video as a starter:

 

https://www.youtube.com/watch?v=Mbmt-6o-Bp0

As neurons send signals through their axons and receive signals through their dendrites, its inner matter, which include genes must play a very important role in the exchange of ions at the synapses, for their strength and their very existence. The connections of neurons for the creation of circuits dictate behavior. Some say nature others nurture. ????

Huge subject in a few words. WHAT IS THE MATTER.

As neurons send signals through their axons and receive signals through their dendrites, its inner matter, which include genes must play a very important role in the exchange of ions at the synapses, for their strength and their very existence. The connections of neurons for the creation of circuits dictate behavior. Some say nature others nurture. ????

 

Huge subject in a few words. WHAT IS THE MATTER.

Genes???