Jarvis Favored-Consensus Proposal

Dear Avieaters, July 1st, 2002

I have posted two types of proposals. I do not expect all of the items in them to be taken seriously because of a lot of differences of opinions that we have heard contrary to some of the ideas I have suggested. I am just happy even if a small change for the better is made. I post my recommendations mainly for comparative purposes.

The first proposal, called Jarvis Favorites, is actually not mine, but my stealing of the my favorite items from the Reiner, Csillag, Striedter, Perkel, Medina and Puelles proposals, combining them and making some modifications. The result appears to be an updated homology based nomenclature (Csillag-Reiner, Medina-Puelles) that retains most of the old abbreviations above lmd (Csillag-Reiner, Striedter-Perkel), but has more pleasing sounding names, at least in English (Striedter-Perkel), and at the same time incorporates updating brain subdivisions such as the Wulst area (Streidter-Perkel).

In doing so, the nomenclature is homology based, because it uses the terms Pallium, Striatum, and Pallidum. Pallium is a homology based name as Karten has pointedly reminded us at last year's SFN meeting. According to Medina-Puelles proposal this homology is well established for most regions above lmd.

I took Striedter-Perkel's idea and of labeling the laminated separated areas of the above lmd as "Regions". Naming major subdivisions of these areas as "Areas", prefixing all the names with the word Pallium. As an alternative shorcut name, instead of saying "Pallium Region N", it can be named "Region NP", etc.

Instead calling L2, ectostriatum, basalis as Nuclei in the Striedter-Perkel proposal, or by different types of names in the others, I named them Fields L, E, and B following Rose's 1914 logic, but not naming.his is the only exception that I have made to the non-laminated separated part above lmd. Technically speaking, according this scheme and that of Striedter-Perkel's, they should be Area L, Area E, and Area D. However, does anyone not consider these Areas, Fields or Nuclei as not related more to each other than to any other part of the currently name avian neostriatum or other pallial-like regions? If not, then I think it would be wise to name them with a terminology that groups them. We have recent gene expression data from adult songbirds and budgies that suggest these three regions actually form a continuum of cells, in some locations 3-10 cell layers thick, separating lmd from the overlying neostriatum. We will present this at the forum. Unfortunately we will not be able to publish before then due to time constraints, but I hope this would further sway the participants to of the strong relationship between these three regions.

I noticed that none of the proposals labeled L2 as L2, but just called it field L. After Bonke renamed L to L2, and then the surrounding areas to L1 and L3 in the 1970s (I believe), many avian neurobiologist began calling the entire area Field L instead of the small-celled region. I much rather go back to the older definition of L, but have no solution yet as what to do with L1 and L3. If we stay with L1 and L3, then I propose we call the surrounding E shells as E2 and E3, and the surrounding B as B2, B3.

For the subpallial regions, I named the striatum as such, the "Striatum". This encompasses both the currently named PA and LPO. I also indicated the adult topographic positions of where the PA and LPO would be located in the sagital sections drawn. In all the sections shown, the old PA area happens to be caudal in the section and the old LPO area happens to be anterior, and I indicated those positions as such in italics. I also went ahead a labeled the Lateral Septum as "Striatum Septum." Since most, if not all of us, who are aware of the knowledge now consider lateral septum as part of striatum, why not label it as such. Why wait for the mammalian neurobiologists to do it? Tony's dopamine picture sent a few days ago is convincing at least in topography. Our gene expression studies show similar results in songbirds. The septum is really the striatum and pallidum wrapped around the ventricle. The lateral septum is really the medial striatum, not LPO. Is there logic to this for everyone? I named INP as IN-striatum for inner striatum nucleus. I will think of something better though.

I included Csillag-Reiner dorsal pallidum and ventral pallidum terms.

I forgot to mention in my prior email that the boundary between the striatal and pallidal regions should technically be drawn as dashed lines, as I personally can not see lamina separating them, at least in the zebra finch sections shown. However, following convention for this area and given that the cell morphologies are so different as to make distinct boundaries, we drew solid lines.

In this combined proposal, the cerebral vocal nuclei retain all their current abbreviations.

The next email is the second proposal.

Erich



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