The frontal aslant tract links posterior inferior frontal and medial superior frontal regions. Its oblique course gives you an anatomical relationship to learn before assigning a function.
Select each structure to light it on the atlas, then rotate until you can name what lies in front, behind and beneath it.
Targets
44 · inferior frontal
6ma · anterior medial premotor
6mp · posterior medial premotor
Compare
Compare parcel 44 with medial premotor references 6ma and 6mp. Inspect the intervening FAT sample from lateral and superior views.
Read the neighbours
Anatomical FAT descriptions include SMA and pre-SMA. 6mp and 6ma orient their territories without certifying individual streamline terminations.
This lesson retains the left hemisphere because its language experiments concern the left FAT.
Explain before revealing
Is the FAT principally a frontal-to-temporal or a lateral-to-medial frontal relationship?
Explanation
A lateral-to-medial frontal relationship. Contrast it with pathways that extend into the temporal lobe. The selected cortical parcels help orient the relationship but are not a measured endpoint map for every rendered line.
In a surgical discussion
A frontal lesion may affect a connection between separated cortical regions. Explaining only the nearest gyrus can miss the network relationship under discussion.
The lateral–medial frontal relationship includes SMA and pre-SMA territories in anatomical studies. The language examples concern left-sided experiments; changing the view does not mirror their evidence or establish individual language dominance.
Ask the learner to answer before opening the explanation. Compare the answer with the named structures and the cited method. Teaching point: A lateral-to-medial frontal relationship. Contrast it with pathways that extend into the temporal lobe. The selected cortical parcels help orient the relationship but are not a measured endpoint map for every rendered line.
This relationship draws on 5 cited sources.
Relationship 2 of 5 · reconstruction
Separate an association tract from a projection tract
Orient
Add the corticospinal sample as context. FAT stays within a frontal relationship, whereas CST has a long descending course. Crossing on a projection does not make the two bundles continuous.
Select each structure to light it on the atlas, then rotate until you can name what lies in front, behind and beneath it.
Targets
FAT · frontal aslant tract
CST · corticospinal tract
Compare
Inspect FAT and the dim CST from the anterior and lateral directions. Identify which sample descends below the cerebral hemisphere.
Read the neighbours
Association fibres relate regions within a hemisphere; projection systems link cortex with subcortical levels.
Two bundles can overlap in a two-dimensional view while following different three-dimensional trajectories.
Explain before revealing
If FAT and CST cross on the screen, what observation helps distinguish crossing from apparent overlap?
Explanation
Rotate to a second plane and follow each sample away from the intersection. Their trajectories remain separately identified. Even an apparent anatomical crossing does not demonstrate communication between those fibres.
In a surgical discussion
For a deep frontal discussion, distinguish speech-related network anatomy from descending motor anatomy rather than using “eloquent white matter” as the only description.
The lateral–medial frontal relationship includes SMA and pre-SMA territories in anatomical studies. The language examples concern left-sided experiments; changing the view does not mirror their evidence or establish individual language dominance.
Ask the learner to answer before opening the explanation. Compare the answer with the named structures and the cited method. Teaching point: Rotate to a second plane and follow each sample away from the intersection. Their trajectories remain separately identified. Even an apparent anatomical crossing does not demonstrate communication between those fibres.
This relationship draws on 5 cited sources.
Relationship 3 of 5 · functional measurement
Ask which part of speech production changed
Orient
Speech fluency is not one operation. Word retrieval, phrase planning and articulation can be examined separately. The cited stimulation case measured phrase-boundary pauses and intra-word timing.
Rotate the atlas until you can name what lies in front, behind and beneath the displayed structures.
Compare
Keep the left FAT visible while stating the task distinction. No stimulation marker is shown: the picture supplies anatomy; the paper supplies the experimental observation.
Read the neighbours
In the 2019 case, stimulation prolonged pauses at phrase boundaries without the same effect on intra-word articulation.
An anatomical name alone cannot tell you which behavioural component was disrupted.
Explain before revealing
Which observation better supports a planning disturbance: delayed phrase starts or uniformly slower articulation inside every word?
Explanation
Delayed phrase starts match the planning-related distinction examined in that case. The comparison depends on the task and timing measurements; it does not establish an exclusive universal function for the FAT.
In a surgical discussion
When presenting a language finding, report the task and observed error. “Speech arrest” is too broad to communicate every form of impaired speech production.
The lateral–medial frontal relationship includes SMA and pre-SMA territories in anatomical studies. The language examples concern left-sided experiments; changing the view does not mirror their evidence or establish individual language dominance.
Ask the learner to answer before opening the explanation. Compare the answer with the named structures and the cited method. Teaching point: Delayed phrase starts match the planning-related distinction examined in that case. The comparison depends on the task and timing measurements; it does not establish an exclusive universal function for the FAT.
This relationship draws on 3 cited sources.
Relationship 4 of 5 · association
Compare fluency with word finding
Orient
The clinical account becomes more informative when fluency and lexical retrieval are separated. Chernoff’s longitudinal FAT surgical case was compared with a temporal-resection case using the same measures; their fluency and word-finding changes differed.
Rotate the atlas until you can name what lies in front, behind and beneath the displayed structures.
Compare
Describe the medial–lateral frontal course again, then predict why a naming task and connected speech could reveal different difficulties. Reveal the explanation after committing to a prediction.
Read the neighbours
Connected speech requires sequencing words into an utterance; naming an isolated item tests a different task demand.
Cohort correlations and individual postoperative observations support questions to investigate, not a one-to-one tract dictionary.
Explain before revealing
Does preserved naming alone establish that spontaneous sentence production is preserved?
Explanation
No. The tasks impose different demands. Assessing a proposed planning problem requires observations of sentence production as well as the relevant comparison task. The cited observations motivate that distinction without defining a complete intraoperative protocol.
In a surgical discussion
A normal result on one language task cannot by itself summarize every language operation relevant to a frontal lesion. Present the observed dissociation rather than an all-or-none label of intact language.
The lateral–medial frontal relationship includes SMA and pre-SMA territories in anatomical studies. The language examples concern left-sided experiments; changing the view does not mirror their evidence or establish individual language dominance.
Ask the learner to answer before opening the explanation. Compare the answer with the named structures and the cited method. Teaching point: No. The tasks impose different demands. Assessing a proposed planning problem requires observations of sentence production as well as the relevant comparison task. The cited observations motivate that distinction without defining a complete intraoperative protocol.
This relationship draws on 4 cited sources.
Relationship 5 of 5 · schematic
Build a task-specific anatomical explanation
Orient
Hypothetical case: after a left medial frontal procedure, speech initiation and spontaneous right-sided movement are reduced. Naming and articulation are relatively preserved. Intraoperative motor-evoked potentials (MEPs) remained stable.
Select each structure to light it on the atlas, then rotate until you can name what lies in front, behind and beneath it.
Targets
44 · inferior frontal
6ma · anterior medial premotor
6mp · posterior medial premotor
Compare
Compare lateral 44 with medial 6ma and 6mp to explain the distributed frontal relationship. Keep the vignette separate from the group anatomy on screen.
Read the neighbours
Initiation, articulation and force are distinct observations. The pattern raises a medial frontal network question without identifying a single injured tract.
Stable MEPs do not establish preservation of every motor function. The actual lesion, examination and time course determine which explanations remain plausible.
Explain before revealing
Do preserved MEPs settle the explanation for reduced speech initiation and right-sided movement? What information would change your interpretation?
Explanation
No. Characterize initiation, articulation and strength separately. A medial frontal network disturbance is one hypothesis; the examination, postoperative imaging and evolution must also assess ischaemia, haemorrhage and other causes. Stable MEPs do not rule out every motor deficit, identify FAT injury or guarantee recovery.
In a surgical discussion
Compare the FAT and CST relationships learned earlier, then state the individual evidence needed. A familiar medial frontal pattern does not remove the need to assess postoperative complications.
The lateral–medial frontal relationship includes SMA and pre-SMA territories in anatomical studies. The language examples concern left-sided experiments; changing the view does not mirror their evidence or establish individual language dominance.
Ask the learner to answer before opening the explanation. Compare the answer with the named structures and the cited method. Teaching point: No. Characterize initiation, articulation and strength separately. A medial frontal network disturbance is one hypothesis; the examination, postoperative imaging and evolution must also assess ischaemia, haemorrhage and other causes. Stable MEPs do not rule out every motor deficit, identify FAT injury or guarantee recovery.
This relationship draws on 6 cited sources.
Recap
After a left medial frontal procedure, speech initiation and right-sided spontaneous movement fall despite stable MEPs. What would change your anatomical interpretation?
Follow the oblique lateral-to-medial frontal relationship before assigning a role.
Compare the frontal aslant course with a descending projection pathway.
Describe initiation, phrasing, naming and articulation separately before proposing a mechanism.
Review the final explanation
No. Characterize initiation, articulation and strength separately. A medial frontal network disturbance is one hypothesis; the examination, postoperative imaging and evolution must also assess ischaemia, haemorrhage and other causes. Stable MEPs do not rule out every motor deficit, identify FAT injury or guarantee recovery.
Tractography and post-mortem dissection describe FAT relationships with both SMA and pre-SMA. HCP 6mp and 6ma are orientation pointers here, not measured endpoints of this displayed sample.
Primary progressive aphasia cohorts and controls; diffusion measures related to language tests. A cohort association is not a universal deficit prediction.
A longitudinal surgical case involving the left FAT, with a temporal-resection comparison case tested using the same measures. The fluency/naming dissociation in these two cases does not assign an exclusive function or population-level risk to a tract.
HCP population reference built from converging cortical features. A parcel boundary here is a group boundary; it does not locate one person’s functional border and it has not been registered to any individual in this viewer.
One awake-mapping case: stimulation changed phrase-boundary timing without the same effect on intra-word articulation. The measured sites are not installed in this atlas.
Provenance for the HCP1065 population-averaged bundles rendered here. Every displayed line is an average-space reconstruction sampled for display; it is not a patient’s pathway and carries no direction of conduction.
Healthy-volunteer tractography comparing descending contributions by cortical origin. Streamline distributions depend on acquisition, model and ROI recipe; they are not axon counts and they are not transferable to a patient.
Surgical series correlating resection extent with postoperative deficit and recovery. The recovery pattern belongs to that series and its follow-up, not to any picture on this screen.
Retrospective peri-Rolandic tumour-surgery series with lesion-symptom mapping. Motor deficits could persist despite unchanged MEPs. This supports broader motor assessment, not a diagnosis or recovery guarantee for the hypothetical case.