Hello Christophe, hello all,

I would like to know if the way that the transverse gyrus is labelled in freesurfer, and specifically the fact that in the case of multiple transverse gyri only the more anterior transverse temporal gyrus (ie; Heschl's gyrus) is included, has changed across different releases of freesurfer, or if it differs between the different atlases used by freesurfer. I ask this because I see a somewhat different pattern of results in this part of the brain when comparing output generated by freesurfer version 3.0.5 and version 4.4.

More generally, I would like to know if there is any version of freesurfer, or any atlas, that includes multiple transverse gyri when they exist (ie; that does NOT exclude the more posterior one in cases of multiple transverse gyri).

thanks in advance and best wishes, Narly.

On Thu, 2009-08-06 at 20:57 +0200, Christophe Destrieux wrote:

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Hi Narly

below are a few explanations on the transverse temporal gyrus in the a2005 parcellation

At the superior aspect of the superior temporal gyrus:

• the transverse temporal *sulcus* limits the planum temporale

(posteriorly) from the transverse temporal gyrus (anteriorly); it originates at the posterior segment of the lateral sulcus, runs anterior and lateral and joins the lateral aspect of the temporal lobe.

• The transverse temporal gyrus (or Heschl's gyrus) is just anterior

and parallel to the transverse temporal sulcus. Instead of a single transverse temporal gyrus, several “transverse” temporal gyri bordered by intermediate sulci may be present. Only the more anterior transverse temporal gyrus is labeled in Freesurfer, the posterior ones being included in the planum temporale since they where shown not to correspond to primary, but to secondary auditory cortex

I hope that it helped

cheers

-- Christophe Destrieux Laboratoire d'Anatomie - Faculté de Médecine - 10 Bd Tonnellé 37032 Tours - France tel (33) 2 47 36 61 36 - fax (33) 2 47 36 62 07

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Narly,

I'm forwarding this to Christophe Destrieux, cc'd, who I think can answer your question about how that region is labelled.

It is not possible to do translucent viewing in tksurfer. However, it is possible in qdec. Just use the load surface and load annotation menu options.

Nick

On Thu, 2009-08-06 at 16:26 +0100, Narly A Golestani wrote:

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Hello,

I would like to know more about the automatic labelling of the transverse temporal gyrus is done. I looked at the below article but don't see any details about this structure.

https://surfer.nmr.mgh.harvard.edu/ftp/articles/fischl04-parcellation.pdf

I would for example like to know how the boundaries of this structure are defined/determined.

Also, when using tksurfer to view labels ('import annotation'), is it possible to make the 3D brain surface (and labels) translucent so that one can more carefully view where this (medial-spanning) gyrus was identified?

thanks in advance, Narly.

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