AAL Atlas

Overview

The Automated Anatomical Labeling (AAL) brain atlas is a widely used macroanatomical parcellation of the human brain that divides the cerebral cortex and some subcortical structures into discrete regions based on sulcal and gyral landmarks defined on a single T1-weighted structural MRI template (the MNI single-subject brain of a healthy young adult). Constructed through manual delineation by expert neuroanatomists on this normalized template, the original AAL atlas comprises 116 regions (including cortical, subcortical, and cerebellar areas), each assigned a unique label and index, with subsequent versions extending or refining these parcellations and adapting them to different templates and modalities. The AAL atlas is extensively used in functional and structural neuroimaging for region-of-interest analyses, connectivity and network studies, voxel-based morphometry, and for standardizing the anatomical labeling of activation clusters and brain networks across studies in cognitive and clinical neuroscience. Atlas Website

Overview generated by GPT-4o (2026).

Click any region name to view its full visualization and description.

ID Acronym Region
2001 Precentral_L precentral (left)_left
2002 Precentral_R precentral (right)_right
2101 Frontal_Sup_L frontal sup (left)_left
2102 Frontal_Sup_R frontal sup (right)_right
2111 Frontal_Sup_Orb_L frontal sup orb (left)_left
2112 Frontal_Sup_Orb_R frontal sup orb (right)_right
2201 Frontal_Mid_L frontal mid (left)_left
2202 Frontal_Mid_R frontal mid (right)_right
2211 Frontal_Mid_Orb_L frontal mid orb (left)_left
2212 Frontal_Mid_Orb_R frontal mid orb (right)_right
2301 Frontal_Inf_Oper_L frontal inf oper (left)_left
2302 Frontal_Inf_Oper_R frontal inf oper (right)_right
2311 Frontal_Inf_Tri_L frontal inf tri (left)_left
2312 Frontal_Inf_Tri_R frontal inf tri (right)_right
2321 Frontal_Inf_Orb_L frontal inf orb (left)_left
2322 Frontal_Inf_Orb_R frontal inf orb (right)_right
2331 Rolandic_Oper_L rolandic oper (left)_left
2332 Rolandic_Oper_R rolandic oper (right)_right
2401 Supp_Motor_Area_L supp motor area (left)_left
2402 Supp_Motor_Area_R supp motor area (right)_right
2501 Olfactory_L olfactory (left)_left
2502 Olfactory_R olfactory (right)_right
2601 Frontal_Sup_Medial_L frontal sup medial (left)_left
2602 Frontal_Sup_Medial_R frontal sup medial (right)_right
2611 Frontal_Med_Orb_L frontal med orb (left)_left
2612 Frontal_Med_Orb_R frontal med orb (right)_right
2701 Rectus_L rectus (left)_left
2702 Rectus_R rectus (right)_right
3001 Insula_L insula (left)_left
3002 Insula_R insula (right)_right
4001 Cingulum_Ant_L cingulum ant (left)_left
4002 Cingulum_Ant_R cingulum ant (right)_right
4011 Cingulum_Mid_L cingulum mid (left)_left
4012 Cingulum_Mid_R cingulum mid (right)_right
4021 Cingulum_Post_L cingulum post (left)_left
4022 Cingulum_Post_R cingulum post (right)_right
4101 Hippocampus_L hippocampus (left)_left
4102 Hippocampus_R hippocampus (right)_right
4111 ParaHippocampal_L parahippocampal (left)_left
4112 ParaHippocampal_R parahippocampal (right)_right
4201 Amygdala_L amygdala (left)_left
4202 Amygdala_R amygdala (right)_right
5001 Calcarine_L calcarine (left)_left
5002 Calcarine_R calcarine (right)_right
5011 Cuneus_L cuneus (left)_left
5012 Cuneus_R cuneus (right)_right
5021 Lingual_L lingual (left)_left
5022 Lingual_R lingual (right)_right
5101 Occipital_Sup_L occipital sup (left)_left
5102 Occipital_Sup_R occipital sup (right)_right
5201 Occipital_Mid_L occipital mid (left)_left
5202 Occipital_Mid_R occipital mid (right)_right
5301 Occipital_Inf_L occipital inf (left)_left
5302 Occipital_Inf_R occipital inf (right)_right
5401 Fusiform_L fusiform (left)_left
5402 Fusiform_R fusiform (right)_right
6001 Postcentral_L postcentral (left)_left
6002 Postcentral_R postcentral (right)_right
6101 Parietal_Sup_L parietal sup (left)_left
6102 Parietal_Sup_R parietal sup (right)_right
6201 Parietal_Inf_L parietal inf (left)_left
6202 Parietal_Inf_R parietal inf (right)_right
6211 SupraMarginal_L supramarginal (left)_left
6212 SupraMarginal_R supramarginal (right)_right
6221 Angular_L angular (left)_left
6222 Angular_R angular (right)_right
6301 Precuneus_L precuneus (left)_left
6302 Precuneus_R precuneus (right)_right
6401 Paracentral_Lobule_L paracentral lobule (left)_left
6402 Paracentral_Lobule_R paracentral lobule (right)_right
7001 Caudate_L caudate (left)_left
7002 Caudate_R caudate (right)_right
7011 Putamen_L putamen (left)_left
7012 Putamen_R putamen (right)_right
7021 Pallidum_L pallidum (left)_left
7022 Pallidum_R pallidum (right)_right
7101 Thalamus_L thalamus (left)_left
7102 Thalamus_R thalamus (right)_right
8101 Heschl_L heschl (left)_left
8102 Heschl_R heschl (right)_right
8111 Temporal_Sup_L temporal sup (left)_left
8112 Temporal_Sup_R temporal sup (right)_right
8121 Temporal_Pole_Sup_L temporal pole sup (left)_left
8122 Temporal_Pole_Sup_R temporal pole sup (right)_right
8201 Temporal_Mid_L temporal mid (left)_left
8202 Temporal_Mid_R temporal mid (right)_right
8211 Temporal_Pole_Mid_L temporal pole mid (left)_left
8212 Temporal_Pole_Mid_R temporal pole mid (right)_right
8301 Temporal_Inf_L temporal inf (left)_left
8302 Temporal_Inf_R temporal inf (right)_right
9001 Cerebelum_Crus1_L cerebelum crus1 (left)_left
9002 Cerebelum_Crus1_R cerebelum crus1 (right)_right
9011 Cerebelum_Crus2_L cerebelum crus2 (left)_left
9012 Cerebelum_Crus2_R cerebelum crus2 (right)_right
9021 Cerebelum_3_L cerebelum 3 (left)_left
9022 Cerebelum_3_R cerebelum 3 (right)_right
9031 Cerebelum_4_5_L cerebelum 4 5 (left)_left
9032 Cerebelum_4_5_R cerebelum 4 5 (right)_right
9041 Cerebelum_6_L cerebelum 6 (left)_left
9042 Cerebelum_6_R cerebelum 6 (right)_right
9051 Cerebelum_7b_L cerebelum 7b (left)_left
9052 Cerebelum_7b_R cerebelum 7b (right)_right
9061 Cerebelum_8_L cerebelum 8 (left)_left
9062 Cerebelum_8_R cerebelum 8 (right)_right
9071 Cerebelum_9_L cerebelum 9 (left)_left
9072 Cerebelum_9_R cerebelum 9 (right)_right
9081 Cerebelum_10_L cerebelum 10 (left)_left
9082 Cerebelum_10_R cerebelum 10 (right)_right
9100 Vermis_1_2 vermis 1 2_bilateral
9110 Vermis_3 vermis 3_bilateral
9120 Vermis_4_5 vermis 4 5_bilateral
9130 Vermis_6 vermis 6_bilateral
9140 Vermis_7 vermis 7_bilateral
9150 Vermis_8 vermis 8_bilateral
9160 Vermis_9 vermis 9_bilateral
9170 Vermis_10 vermis 10_bilateral

Citation

Wali Sidiqyar*, Gaurav Rudravaram*, Elyssa M. McMaster, Trent M. Schwartz, Adam M. Saunders, Kurt G. Schilling, Bennett A. Landman "Introducing SPINS: A Shared Public Visualization Library of Neuroanatomical Structures." Medical Imaging with Deep Learning- short paper

This resource is licensed under CC0 1.0 Universal (Public Domain).