An entirely novel approach bases the parcellation of the cortex on a receptorarchitectonic analysis which considers the distribution of different types of neurotransmitter systems (e.g. Noradrenalin, Acetylcholin, GABA, Glutamat, Serotonin, Dopamin, Adenosin etc.) in the cortex (Amunts et al., 2010, Zilles & Amunts, 2009).
A receptorarchitectonic analysis of the left prefrontal cortex reveals, a more fine grained parcellation than the cytoarchitectonic analysis. Area 45 can be subdivided into two parts, a more anterior area 45a bordering BA 47 and a more posterior area 45p bordering BA 44 (Amunts et al., 2010) (see Fig. 3). Area 44 can also be receptorarchitectonically subdivided two parts a dorsal (44d) and a ventral area (44v). These subdivisions may be of particular functional relevance for language, since different language studies have allocated different functions, such as semantics and syntax, to different locations within area 45, and area 44. These may now be assigned to different subregions within 45 (45a vs 45p) and 44 (44d vs 44v).
Receptorarchitectonic analyses of the temporal cortex are not yet available, but studies are ongoing.