Tracts

Streamlines from the HCP-1065 population-averaged tractography atlas (Yeh 2022), 87 tracts. The cortex is shown as glass. Up to 160 streamlines per tract are drawn, resampled to 24 points each.

Loading the 3D model…

Point at the model to identify a structure. Click to select it.

Neurological convention: sections viewed from above and behind, patient left on screen left. 3D views are never mirrored.

Template anatomy for education. Not patient-specific. Not for clinical decision-making.

Tract index

Association

Association tracts
Tract	Side	Streamlines shown / in atlas	Mean length, mm
Arcuate fasciculus AF_L	left	160 / 34,156	134
Arcuate fasciculus AF_R	right	160 / 3,356	134
Cingulum frontal parahippocampal C_FPH_L	left	160 / 679	111
Cingulum frontal parahippocampal C_FPH_R	right	142 / 142	116
Cingulum frontal parietal C_FP_L	left	160 / 10,806	94
Cingulum frontal parietal C_FP_R	right	160 / 9,146	88
Cingulum parahippocampal parietal C_PHP_L	left	74 / 74	103
Cingulum parahippocampal parietal C_PHP_R	right	160 / 386	104
Cingulum parahippocampal C_PH_L	left	160 / 1,022	40
Cingulum parahippocampal C_PH_R	right	160 / 1,245	35
Cingulum parolfactory C_PO_L	left	160 / 1,356	72
Cingulum parolfactory C_PO_R	right	160 / 958	110
Extreme capsule EMC_L	left	160 / 7,265	108
Extreme capsule EMC_R	right	160 / 12,874	102
Frontal aslant tract FAT_L	left	160 / 12,708	86
Frontal aslant tract FAT_R	right	160 / 5,057	80
Inferior fronto occipital fasciculus IFOF_L	left	160 / 30,856	185
Inferior fronto occipital fasciculus IFOF_R	right	160 / 11,167	166
Inferior longitudinal fasciculus ILF_L	left	160 / 21,209	115
Inferior longitudinal fasciculus ILF_R	right	160 / 14,596	116
Middle longitudinal fasciculus MdLF_L	left	160 / 1,674	113
Middle longitudinal fasciculus MdLF_R	right	160 / 3,244	102
Parietal aslant tract PAT_L	left	160 / 4,357	60
Parietal aslant tract PAT_R	right	160 / 6,213	56
Superior longitudinal fasciculus 1 SLF1_L	left	160 / 2,514	90
Superior longitudinal fasciculus 1 SLF1_R	right	160 / 4,668	107
Superior longitudinal fasciculus 2 SLF2_L	left	160 / 12,687	89
Superior longitudinal fasciculus 2 SLF2_R	right	160 / 11,528	116
Superior longitudinal fasciculus 3 SLF3_L	left	160 / 2,637	69
Superior longitudinal fasciculus 3 SLF3_R	right	160 / 17,028	67
Uncinate fasciculus UF_L	left	160 / 5,672	79
Uncinate fasciculus UF_R	right	160 / 9,425	87
Vertical occipital fasciculus VOF_L	left	160 / 1,756	46
Vertical occipital fasciculus VOF_R	right	160 / 1,074	38

Cerebellum

Cerebellum tracts
Tract	Side	Streamlines shown / in atlas	Mean length, mm
Cerebellum CB_L	left	160 / 68,195	56
Cerebellum CB_R	right	160 / 22,777	56
Inferior cerebellar peduncle ICP_L	left	160 / 3,003	70
Inferior cerebellar peduncle ICP_R	right	160 / 2,315	70
Middle cerebellar peduncle MCP	midline	160 / 2,780	91
Superior cerebellar peduncle SCP	midline	160 / 2,847	53
Vermis V	midline	160 / 4,775	63

Commissural

Commissural tracts
Show	Tract	Side	Streamlines shown / in atlas	Mean length, mm	Select
	Anterior commissure AC	midline	160 / 10,302	256
	Corpus callosum CC	midline	160 / 32,200	135

Cranial Nerves

Cranial Nerves tracts
Tract	Side	Streamlines shown / in atlas	Mean length, mm
CN III CNIII_L	left	160 / 7,888	40
CN III CNIII_R	right	160 / 11,476	36
CN II CNII_L	left	160 / 508	54
CN II CNII_R	right	160 / 1,804	56
CN VIII CNVIII_L	left	160 / 332	57
CN VIII CNVIII_R	right	160 / 273	55
CN VII CNVII_L	left	61 / 61	31
CN VII CNVII_R	right	54 / 54	32
CN V CNV_L	left	160 / 320	32
CN V CNV_R	right	160 / 565	33

Projection

Projection tracts
Tract	Side	Streamlines shown / in atlas	Mean length, mm
Acoustic radiation AR_L	left	160 / 2,252	58
Acoustic radiation AR_R	right	160 / 654	50
Corticobulbar tract CBT_L	left	160 / 165	125
Corticobulbar tract CBT_R	right	160 / 631	126
Corticopontine tract frontal CPT_F_L	left	160 / 1,038	117
Corticopontine tract frontal CPT_F_R	right	160 / 4,576	118
Corticopontine tract occipital CPT_O_L	left	160 / 324	122
Corticopontine tract occipital CPT_O_R	right	160 / 242	115
Corticopontine tract parietal CPT_P_L	left	160 / 3,064	126
Corticopontine tract parietal CPT_P_R	right	160 / 3,393	124
Cortico spinal tract CST_L	left	160 / 5,577	134
Cortico spinal tract CST_R	right	160 / 2,397	132
Corticostriatal tract anterior CS_A_L	left	160 / 959	50
Corticostriatal tract anterior CS_A_R	right	160 / 734	48
Corticostriatal tract posterior CS_P_L	left	123 / 123	77
Corticostriatal tract posterior CS_P_R	right	160 / 165	74
Corticostriatal tract superior CS_S_L	left	160 / 954	55
Corticostriatal tract superior CS_S_R	right	160 / 1,077	55
Dentatorubrothalamic tract DRTT_L	left	160 / 3,698	151
Dentatorubrothalamic tract DRTT_R	right	160 / 6,984	140
Fornix F_L	left	160 / 600	102
Fornix F_R	right	160 / 2,633	102
Medial lemniscus ML_L	left	160 / 6,621	137
Medial lemniscus ML_R	right	160 / 5,817	136
Optic radiation OR_L	left	160 / 1,968	108
Optic radiation OR_R	right	160 / 1,235	101
Reticulospinal tract RST_L	left	160 / 2,382	140
Reticulospinal tract RST_R	right	160 / 3,249	140
Thalamic radiation anterior TR_A_L	left	160 / 602	75
Thalamic radiation anterior TR_A_R	right	160 / 414	75
Thalamic radiation posterior TR_P_L	left	84 / 84	67
Thalamic radiation posterior TR_P_R	right	94 / 94	72
Thalamic radiation superior TR_S_L	left	160 / 1,210	63
Thalamic radiation superior TR_S_R	right	160 / 1,159	61

Read about this

White matter and tractography
The brain's wiring, how diffusion MRI reveals it, the maths of tensors and networks, and the limits of mapping tracts.
Intermediate
The motor system
How the brain turns intention into movement, from the redrawn motor homunculus to the laws of reaching and the technology that restores it.
Intermediate
Language and speech
Where language lives in the brain, why it is not the same as thought, and how AI language models and speech implants are changing the field.
Intermediate
Neurons and electrical signals
How a nerve cell makes a 100-millivolt spike, the equations that describe it, and why one neuron may be a deep network in disguise.
Introductory