Table 1.
The different orders of trajectories are given with the corresponding cortical regions and the underlying cortical type
| Trajectory | Region | Cortical type |
|---|---|---|
| Linear | Piriform | Allocortex |
| L entorhinal/perirhinal | Transition cortex | |
| Subgenual cingulate | Transition cortex | |
| Posterior orbitofrontal | Transition cortex | |
| Frontal operculum | Transition cortex | |
| Anterior insula | Transition cortex | |
| Medial occipitotemporal | Homotypical isocortex | |
| Quadratic | Anterior cingulate (ventral supracallosal part) | Transition cortex |
| Posterior orbitofrontal | Transition cortex | |
| R entorhinal/perirhinal | Transition cortex | |
| R parahippocampal | Homotypical isocortex | |
| R anterior superior temporal | Homotypical isocortex | |
| L temporal polar | Homotypical isocortex | |
| Body of insula | Homotypical and dysgranular isocortex | |
| Cubic | Lateral orbitofrontal | Homotypical isocortex |
| Medial and lateral frontal pole | Homotypical isocortex | |
| Lateral prefrontal (superior, middle, and inferior gyri) | Homotypical isocortex | |
| Anterior cingulate (dorsal supracallosal part) | Agranular isocortex | |
| Precentral motor | Agranular isocortex | |
| Somatosensory | Granular isocortex | |
| Posterior parietal | Homotypical isocortex | |
| Posterior insular | Homotypical isocortex | |
| Auditory | Granular isocortex | |
| Lateral temporal cortex | Homotypical isocortex | |
| Polar occipital | Granular isocortex | |
| Lateral occipital (superior, middle, and inferior gyri) | Homotypical isocortex |
Homotypical isocortex corresponds to the six layer prototype described by Brodmann; the granular cortex is similar to the homotypical isocortex, but has a thick and sometimes complex internal granular layer (layer 4); the agranular isocortex develops in the six-layer pattern of homotypical isocortex, but the cells composing layer 4 disperse during development; dysgranular isocortex has a thin, but discernable layer 4 and in that sense in intermediate between agranular isocortex and homotypical isocortex (but it is not, however, intermediate between isocortex and allocortex); allocortex, the three-layer cortex typified in mammalian brains by the hippocampus and piriform area; transition cortex, cortical areas, typically limbic, with a laminar organization intermediate between allocortex and isocortex. L, Left; R, right.