Work

The MTL200: A surface-based, probabilistic atlas of the medial temporal lobe

Year: 2026

Type: article

Abstract: The human medial temporal lobe (MTL) includes a number of cortical regions surrounding the hippocampus implicated in long-term memory and high-level perception, including entorhinal cortex (ERC), perirhinal cortex (PRC), parahippocampal cortex (PHC), and the medial aspect of temporopolar cortex (TPC). A critical prerequisite to studying the function of these areas is to define their anatomical boundaries. While several atlases or segmentations methods for automated boundary definition exist, they have limitations: (1) they are derived from small sample sizes; (2) most do not include TPC; and (3) they are volumetric rather than surface-based and are therefore not straightforward to use for surface-based analysis of MRI data. Here we present the MTL200: a surface-based, probabilistic atlas of MTL regions ERC, PRC, PHC, and TPC. The atlas is derived from hand drawings of regions based on gross anatomical features corresponding to cytoarchitectonic boundaries, using anatomical MRI data from 200 human participants. This work provides a valuable tool for researchers studying the anatomy and function of MTL regions, particularly the poorly characterized area TPC.

Source: Imaging Neuroscience

DOI: 10.1162/imag.a.1447