{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.habenula","code":"thing-q267641","url":"https://ver.cy/models/thing/q267641/","name":"habenula","alternateNames":[],"kind":"thing","status":"published","version":"0.1.0-research.1","language":"en","classifiers":{"family":"Thing Registry","category":"Physical world and living systems","entryKind":"thing","plane":"PHY","domain":["PHY.OBJ"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"The habenula is a paired epithalamic nuclear complex comprising medial and lateral divisions that links forebrain activity to midbrain and hindbrain circuits involved in motivation, aversion and neuromodulation.","purpose":"Enable an agent to identify a habenula, distinguish its subdivisions and connections, assess recorded observations, and determine which further observations or authorized interventions are justified.","scope":{"in":["Identification of left, right, or paired habenular complexes in a specified organism and developmental stage","Medial and lateral subdivisions where supported by the species and anatomical reference","Habenular tissue boundaries, morphology, and cellular organization","Incoming and outgoing connections described from their habenular endpoints","Localized physiological observations and structural alterations","Evidence quality and localization limits for measurements or interventions"],"out":["The epithalamus, thalamus, or whole brain as complete anatomical systems","The pineal gland and its endocrine functions","The stria medullaris, fasciculus retroflexus, and habenular commissure as independently modeled fiber tracts","Downstream nuclei and neurotransmitter systems beyond their relations to the habenula","Psychiatric diagnoses or behavioral states inferred solely from habenular observations","Imaging equipment, stimulation devices, and experimental protocols as independent things"],"boundaries":[]},"distinguishingFeatures":["In human anatomical identification, require localization beside the third ventricle and anterior to the pineal body, together with tissue or atlas evidence; proximity alone is insufficient. [Human ex vivo MRI study](https://pmc.ncbi.nlm.nih.gov/articles/PMC3870283/)","Distinguish the habenular nuclear tissue from neighboring fiber bundles; continuity with a tract does not make that tract part of the nuclear boundary.","Check for medial and lateral organization where the species and observation method support it; an unresolved subdivision must remain unresolved rather than receiving an inferred label.","Use connection evidence as corroboration: mouse research identifies the stria medullaris as the principal afferent route and the fasciculus retroflexus as the principal efferent route. [Mouse tracing study](https://pmc.ncbi.nlm.nih.gov/articles/PMC9203815/)","Distinguish the anatomical structure from an atlas label or imaging region of interest: a region labeled 'habenula' requires documented correspondence to actual tissue."],"structure":{"bundles":[{"id":"habenular-identity-and-boundaries","name":"Habenular identity and boundaries","description":"Establish which anatomical tissue the entry denotes in a particular organism.","layers":[{"id":"organism-and-anatomical-unit","name":"Organism and anatomical unit","description":"Resolve biological context and the extent of the named structure.","findings":[{"id":"qualified-habenular-identity","name":"Qualified habenular identity","description":"Require species, developmental stage, laterality, and anatomical extent before combining observations.","questions":[{"text":"Which species and developmental stage does this habenula belong to?","id":"qualified-habenular-identity-q01","kind":"definition"},{"text":"Does the observation concern one habenula, both sides, or a named subdivision?","id":"qualified-habenular-identity-q02","kind":"boundary"}]}]},{"id":"nuclear-tissue-boundary","name":"Nuclear tissue boundary","description":"Separate the habenular nuclei from neighboring tissue and connecting tracts.","findings":[{"id":"boundary-evidence","name":"Boundary evidence","description":"Document the anatomical reference and visible features used to include nuclear tissue and exclude adjacent structures.","questions":[{"text":"Which atlas, histological features, or imaging landmarks support the habenular boundary?","id":"boundary-evidence-q01","kind":"provenance"},{"text":"How were pineal tissue, neighboring thalamic tissue, cerebrospinal fluid, and fiber tracts excluded?","id":"boundary-evidence-q02","kind":"boundary"}]}]}]},{"id":"habenular-internal-organization","name":"Habenular internal organization","description":"Represent subdivisions and cellular observations without assuming uniform tissue.","layers":[{"id":"subdivision-assignment","name":"Subdivision assignment","description":"Qualify medial, lateral, and finer labels against a species-specific anatomical reference.","findings":[{"id":"resolved-habenular-territory","name":"Resolved habenular territory","description":"Record subdivision assignments only where the measurement or reference supports them.","questions":[{"text":"Can medial and lateral habenular tissue actually be distinguished in this observation?","id":"resolved-habenular-territory-q01","kind":"measurement"},{"text":"Which species-specific reference defines any finer subnuclear labels being used?","id":"resolved-habenular-territory-q02","kind":"provenance"}]}]},{"id":"cellular-composition","name":"Cellular composition","description":"Attach cellular and molecular evidence to a localized tissue sample.","findings":[{"id":"localized-cell-profile","name":"Localized cell profile","description":"Represent marker expression and cell-class observations as assay-qualified evidence rather than universal identifiers.","questions":[{"text":"Which habenular territory and tissue fraction were sampled for the reported cellular profile?","id":"localized-cell-profile-q01","kind":"boundary"},{"text":"Which assay and classification reference support the reported markers or cell classes?","id":"localized-cell-profile-q02","kind":"provenance"}]}]}]},{"id":"habenular-circuit-interfaces","name":"Habenular circuit interfaces","description":"Describe connections entering and leaving identified habenular territories.","layers":[{"id":"afferent-interface","name":"Afferent interface","description":"Record incoming pathways and their demonstrated termination sites.","findings":[{"id":"localized-afferent-evidence","name":"Localized afferent evidence","description":"Require evidence for both the origin and habenular termination of an asserted input.","questions":[{"text":"Which source region projects to which side and subdivision of the habenula?","id":"localized-afferent-evidence-q01","kind":"boundary"},{"text":"Does the method demonstrate terminating afferents, or only nearby fibers or correlated activity?","id":"localized-afferent-evidence-q02","kind":"provenance"}]}]},{"id":"efferent-interface","name":"Efferent interface","description":"Record outgoing projections without collapsing direct and indirect circuit relationships.","findings":[{"id":"subdivision-specific-output","name":"Subdivision-specific output","description":"Rat tracing research demonstrates distinct medial and lateral habenular efferent organization; preserve species and subdivision when recording outputs. [Rat efferent tracing study](https://pubmed.ncbi.nlm.nih.gov/226566/)","questions":[{"text":"Which habenular subdivision supplies the observed projection, and where does it terminate?","id":"subdivision-specific-output-q01","kind":"boundary"},{"text":"What evidence distinguishes a direct projection from an indirect downstream influence?","id":"subdivision-specific-output-q02","kind":"provenance"}]}]}]},{"id":"habenular-observation-and-state","name":"Habenular observation and state","description":"Make structural and physiological observations interpretable at the scale of the habenula.","layers":[{"id":"morphology-and-resolution","name":"Morphology and resolution","description":"Record tissue dimensions alongside the limits of their measurement.","findings":[{"id":"interpretable-habenular-morphometry","name":"Interpretable habenular morphometry","description":"Couple volume and shape observations to side, preparation, segmentation, and spatial resolution.","questions":[{"text":"What habenular volume or shape was measured, and with what uncertainty?","id":"interpretable-habenular-morphometry-q01","kind":"measurement"},{"text":"How do voxel size, section thickness, tissue preparation, and boundary choices affect the result?","id":"interpretable-habenular-morphometry-q02","kind":"measurement"}]}]},{"id":"physiological-context","name":"Physiological context","description":"Interpret a localized signal in its recording and behavioral context.","findings":[{"id":"qualified-habenular-activity","name":"Qualified habenular activity","description":"Keep the measured signal separate from hypotheses about reward, aversion, arousal, or other functions.","questions":[{"text":"Which signal was recorded from which habenular territory, over what interval and relative to what baseline?","id":"qualified-habenular-activity-q01","kind":"measurement"},{"text":"What evidence supports assigning the signal to habenular tissue rather than neighboring tissue or measurement artifact?","id":"qualified-habenular-activity-q02","kind":"provenance"},{"text":"Which task events, organism states, and competing explanations constrain its interpretation?","id":"qualified-habenular-activity-q03","kind":"boundary"}]}]}]},{"id":"habenular-alteration-and-targeting","name":"Habenular alteration and targeting","description":"Represent local tissue changes and the anatomical specificity of sampling or perturbation.","layers":[{"id":"local-alteration","name":"Local alteration","description":"Localize structural changes and qualify comparisons.","findings":[{"id":"localized-tissue-change","name":"Localized tissue change","description":"Record observed abnormalities or longitudinal changes without converting them directly into a diagnosis.","questions":[{"text":"What change is observed, and which side, subdivision, or neighboring tract is involved?","id":"localized-tissue-change-q01","kind":"boundary"},{"text":"Which baseline or comparison establishes the change, and are the measurement methods compatible?","id":"localized-tissue-change-q02","kind":"measurement"}]}]},{"id":"sampling-and-perturbation-specificity","name":"Sampling and perturbation specificity","description":"Evaluate whether an action can be attributed to the intended habenular target.","findings":[{"id":"verified-habenular-target","name":"Verified habenular target","description":"Link proposed or completed sampling and perturbation to localization evidence, affected tissue extent, and applicable authorization.","questions":[{"text":"How much of the sampled or affected region overlaps the intended habenular subdivision and adjacent tissue?","id":"verified-habenular-target-q01","kind":"measurement"},{"text":"What localization verification and applicable authorization are required before the proposed action?","id":"verified-habenular-target-q02","kind":"action"},{"text":"Could the observed effect arise from connecting fibers or neighboring structures rather than the targeted habenular neurons?","id":"verified-habenular-target-q03","kind":"boundary"}]}]}]},{"id":"evidence-and-external-alignment","name":"Evidence and external alignment","description":"What the world already says about this thing, gathered so the model can be checked against it.","layers":[{"id":"reported-evidence","name":"Reported evidence","description":"Findings from the breadth pass, kept separate from the structural claims.","findings":[{"id":"evidence-confidence-notes","name":"Check these first","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these check these first hold for the sense of habenula this model covers, and on what evidence?","id":"evidence-confidence-notes-q01","kind":"provenance"}]},{"id":"evidence-kinds","name":"Kinds and varieties","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these kinds and varieties hold for the sense of habenula this model covers, and on what evidence?","id":"evidence-kinds-q01","kind":"provenance"}]},{"id":"evidence-standards-and-regulation","name":"Standards and regulation","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these standards and regulation hold for the sense of habenula this model covers, and on what evidence?","id":"evidence-standards-and-regulation-q01","kind":"provenance"}]},{"id":"evidence-real-world-use","name":"Real-world use","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these real-world use hold for the sense of habenula this model covers, and on what evidence?","id":"evidence-real-world-use-q01","kind":"provenance"}]},{"id":"evidence-failure-modes-and-hazards","name":"Failure modes and hazards","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these failure modes and hazards hold for the sense of habenula this model covers, and on what evidence?","id":"evidence-failure-modes-and-hazards-q01","kind":"provenance"}]},{"id":"evidence-neighbours","name":"Neighbouring kinds and how to tell them apart","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these neighbouring kinds and how to tell them apart hold for the sense of habenula this model covers, and on what evidence?","id":"evidence-neighbours-q01","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Describe the habenula and current research on its role in aversion and motivation, with sources.","Support authorized researchers in labelling it on brain imaging."],"mustNot":["Present early research on the habenula as an established treatment for depression or addiction.","Interpret a person's brain scan as evidence of a mental disorder without clinical review.","Share identifiable brain imaging without consent."],"requiresHuman":["Any decision about brain stimulation or surgery targeting it."]},"ethics":{"considerations":["Experimental brain treatments raise hope in desperate patients and must be described honestly.","Brain data is highly sensitive and can stigmatize."],"affectedParties":["Patients with depression or addiction","Research participants","Families"]},"owners":{"steward":"Nobody: part of a person's brain; clinicians and researchers answer for its study and care.","roles":[],"masterSystems":[]},"relations":[{"target":"Q66572128","type":"parent","note":"registry parent class"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.habenula","Wikidata: Q267641 (https://www.wikidata.org/wiki/Q267641)"]},"properties":{"applicability":"required","items":["Organism and developmental context: Organism identifier, species, age or developmental stage","Laterality and anatomical extent: Left | right | bilateral; whole complex | medial subdivision | lateral subdivision | specified subnucleus | unresolved","Reference-space location: Coordinates in mm or µm, with atlas version, origin, axes, and transformation","Habenular tissue volume: mm³, with side, segmentation method, specimen condition, and uncertainty","Subdivision resolution: Resolved | partially resolved | unresolved | not assessed","Cellular or molecular profile: Assay-defined cell classes or marker profiles, with sampled subdivision and species","Connection evidence: Source region, target region, direction, tract, method, species, and confidence","Localized activity: Spikes/s, mV, ΔF/F, or BOLD percent signal change, with modality and observation window","Local tissue condition: No alteration detected | specified alteration detected | indeterminate | not assessed","Target overlap: Percentage or volume of a sampling, lesion, or stimulation region overlapping the identified habenula"]},"recognition":{"applicability":"required","items":["A small paired structure next to the pineal gland at the back of the third ventricle."]},"capabilities":{"applicability":"required","items":["Locate and annotate habenular tissue in an image, atlas, or specimen with explicit boundary confidence.","Assign observations to a side and subdivision at the resolution the evidence supports.","Compare morphology across observations with compatible species, preparation, and segmentation methods.","Trace documented inputs and outputs while separating anatomical, functional, and inferred connectivity.","Assess whether a recording or perturbation actually sampled habenular tissue and nearby structures.","Identify missing localization or authorization evidence before proposing further sampling or intervention."]},"hazards":{"applicability":"required","items":["Experimental interventions near deep brain structures carry surgical risks.","Small size makes imaging findings easy to misread."]},"interfaces":{"applicability":"required","items":["Terminologia Anatomica, Federative International Programme for Anatomical Terminology."]},"context":{"applicability":"required","items":["The habenula is examined in neuroanatomy, brain imaging and neuroscience research on motivation, aversion and behavioral adaptation.","Its medial and lateral divisions are studied separately because they have different connections and functional roles.","Anatomical localization supports interpretation of tissue sections, neural recordings and circuit studies."]}},"sources":[{"title":"Wikidata item Q267641: habenula","url":"https://www.wikidata.org/wiki/Q267641","note":"identity and sense of the item"},{"title":"Wikipedia: Habenula","url":"https://en.wikipedia.org/wiki/Habenula","note":"general description of the item"}],"openQuestions":["Does the registry intend a vertebrate-wide anatomical kind or a specifically human habenula, given the missing definition?","Which cross-species subdivision correspondences are sufficiently established to support shared labels, particularly outside mammals?","Which boundary conventions should govern inclusion of perihabenular tissue and attached commissural or tract tissue in reported measurements?","What measurement-specific evidence is sufficient to resolve medial and lateral subdivisions in living subjects?","Which functional or condition-associated findings replicate with adequate subdivision localization, and which remain correlational or species-specific?"],"resources":{"spec":"/models/things/publications/thing-q267641/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q267641/spec.json"],"providers":["Codex"],"researchStatus":"unreviewed","generatedAt":"2026-09-12T10:09:00Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"filled","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-07T10:10:29+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}