# Grids into Maps!

**URL:** <https://discourse.numenta.org/t/grids-into-maps/3618>\
**Category:** Tangential Theories\
**Tags:** grid-cells, cortical-maps, axon-projection, agi-tools\
**Created:** [March 11, 2018, 3:16am UTC](https://discourse.numenta.org/t/grids-into-maps/3618 "2018-03-11T03:16:49Z")\
**Posts on this page:** 1\
**Showing post:** 22

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**Author:** ![mthiboust](https://yyz2.discourse-cdn.com/flex030/user_avatar/discourse.numenta.org/mthiboust/32/4509_2.png) [@mthiboust](https://discourse.numenta.org/u/mthiboust)\
**Post date:** [January 20, 2020, 6:47am UTC](https://discourse.numenta.org/t/grids-into-maps/3618/22 "2020-01-20T06:47:20Z")

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Concerning the excitatory cells, I was referring to L5 PT and L6 CT cortical pyramidal cells that project to the thalamus, and to the _miscalled_ thalamic “relay” cells (“miscalled” because they probably do more than a simple relay)

It seems that virtually all axons between the thalamus and the cortex give some collaterals in the TRN (which sends inhibitory inputs to thalamic relay cells and/or other inhibitory thalamic interneurons).

This illustration from [Sherman’s video](https://discourse.numenta.org/t/lets-watch-murray-sherman-talk-about-the-thalamus/7033) shows the different options:  
 ![image](https://canada1.discourse-cdn.com/flex030/uploads/numenta/original/2X/1/1c9cd8e2d6b2edc10423719d2a878b27667f86ef.png)

Other illustrations from the same video:  
 ![image](https://canada1.discourse-cdn.com/flex030/uploads/numenta/original/2X/9/9c7d52c32cf418fd31b25b5719093c468cd1dfe8.png)  
 ![image](https://canada1.discourse-cdn.com/flex030/uploads/numenta/original/2X/f/fc6d09a1063ea9157d8aa685907476d36073c33d.png)

I hope it helps. On my side, I don’t know much about the internal thalamic computations.

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