# Hippocampus sources/surfaces MNE-C

**URL:** <https://mne.discourse.group/t/hippocampus-sources-surfaces-mne-c/7174>\
**Category:** Support & Discussions\
**Created:** [July 4, 2023, 3:57pm UTC](https://mne.discourse.group/t/hippocampus-sources-surfaces-mne-c/7174 "2023-07-04T15:57:30Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Matthias](https://avatars.discourse-cdn.com/v4/letter/m/cdc98d/32.png) [@Matthias](https://mne.discourse.group/u/Matthias)\
**Post date:** [July 4, 2023, 3:57pm UTC](https://mne.discourse.group/t/hippocampus-sources-surfaces-mne-c/7174/1 "2023-07-04T15:57:30Z")

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- MNE\*\*-C\*\* version: 2.7.3
- operating system: Ubuntu 18.04  
Dear MNE Experts,

briefly, my question is whether it is possible to create surface files for the hippocampus?

To elaborate further, my problem is as follows.

I am in the process of replicating an MNE-C based analysis. Here it comes to the following command:

mne\_forward\_solution --meg --accurate \ –src $SUBJECTS\_DIR/$SUBJECT/src/$SUBJECT"\_hipsurf-“$SRCSPACE”-src.fif"

where “$SRCSPACE” = oct-3.

I interpret the hipsurf as a reference to surface files for the hippocampus. Only it is not clear from the rest of the script how this is created.

My solution so far is to calculate a source file for the left and the right part of the hippocampus based on the Aseg atlas using:

mne\_volume\_source\_space --pos $SUBJECTS\_DIR/$SUBJECT/src/$SUBJECT"\_rh.txt" --src $SUBJECTS\_DIR/$SUBJECT/src/$SUBJECT"\_hipsurf\_r-src.fif"  
Afterwards I calculate the mn\_forward\_solution seperatly for left and right and then I merge the outputs manually for the combined forward solution. Is there a more elegant solution here? Or is there a solution that I can create in MNE-Phyton (like [Query on Hippocampus tessellation](https://mne.discourse.group/t/query-on-hippocampus-tessellation/1463)) and then use in MNE-C?

Is it possible, in principle, to switch between MNE-Phyton and MNE-C during an analysis?

Greetings,  
Matthias