Does the biot-savart law explain the magnetic grid pattern seen in the brain?

  • 1 Replies
  • 871 Views

0 Members and 1 Guest are viewing this topic.

*

Offline roger858

  • First timers
  • *
  • 3
    • View Profile
I was interested anyone's opinion on whether the grid pattern seen in diffusion tensor imaging of the brain could be physics based. The biot-savart law, which states an electric current along a rod generates a cylindrical magnetic field with the rod being in the center [attachment=20991].  Could several brain fibers in parallel create a magnetic field capable of starting brain electrical current in a perpendicular direction as can be seen in the dti imaging [attachment=20993]?
« Last Edit: 19/02/2016 08:37:47 by chris »

*

Offline evan_au

  • Neilep Level Member
  • ******
  • 4309
    • View Profile
It is a bit hard to see 3D information in a small 2D photo.

Is this a diffusion MRI, tracing the path of nerve axons?
http://en.wikipedia.org/wiki/Diffusion_MRI#Introduction

The grid pattern appears to be bundles of nerves traveling in different directions, forming a grid pattern?

Please explain the significance of the different arrows.

Note that the pattern of current flow in a neuron is axially symmetric, with ions flowing radially in and out of the axon. Not much current flows along the axon (as it would through a copper wire carrying a DC current). With this pattern of ion flow, I would be surprised to see currents jumping between adjacent bundles of nerves (apart from at synapses, where it is supposed to do this...).