{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.eponychium","code":"thing-q788191","url":"https://ver.cy/models/thing/q788191/","name":"eponychium","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 eponychium is the epidermal tissue at the distal margin of the proximal nail fold, whose keratinized extension forms the cuticle over the emerging nail plate.","purpose":"Enable an agent to identify an eponychium, record its anatomical relationships and observed condition, and assess whether a proposed interaction requires further examination.","scope":{"in":["Identification of the eponychium at a particular fingernail or toenail","Distinction between eponychial tissue, the whole proximal nail fold, and adherent cuticle","Relationships to the proximal nail plate and neighbouring nail-unit structures","Observed tissue condition and continuity of the associated cuticle interface","Local exposure, manipulation, and change over time"],"out":["The complete anatomy and physiology of the nail unit","Nail matrix production of the nail plate","Distal hyponychium and lateral nail folds as independent structures","Diagnosis and treatment models for paronychia or other nail disorders","Manicure tools, cosmetic products, and procedural protocols","Nonhuman structures called eponychium without an established anatomical mapping"],"boundaries":[]},"distinguishingFeatures":["Locate the tissue beneath the proximal nail fold where the nail plate emerges; tissue beneath the distal free edge belongs to the hyponychium.","Distinguish epithelium continuous with the proximal fold from the cornified cuticle extending onto the nail plate.","Require a ventral epithelial boundary before identifying the entire externally visible proximal nail fold as eponychium.","Distinguish the proximal fold lining from the nail matrix and nail bed through anatomical relationships, rather than treating all tissue near the nail root as equivalent.","Record the source's meaning of eponychium: some anatomical literature uses it as a synonym for cuticle, including [Nail anatomy](https://pubmed.ncbi.nlm.nih.gov/24079579/)."],"structure":{"bundles":[{"id":"anatomical-identity","name":"Anatomical identity","description":"Establish what tissue the entry and each observation call eponychium.","layers":[{"id":"term-resolution","name":"Term resolution","description":"Preserve the anatomical meaning used by each source.","findings":[{"id":"declared-tissue-referent","name":"Declared tissue referent","description":"Every imported label needs an explicit mapping to epithelium, cuticle, broader fold, or an unresolved referent.","questions":[{"text":"What tissue does this source mean by eponychium?","id":"declared-tissue-referent-q01","kind":"definition"},{"text":"Which passage or labelled anatomical image establishes that meaning?","id":"declared-tissue-referent-q02","kind":"provenance"}]}]},{"id":"instance-localization","name":"Instance localization","description":"Identify the digit and anatomical landmarks supporting localization.","findings":[{"id":"proximal-ventral-location","name":"Proximal ventral location","description":"Localization must identify the proximal fold region and distinguish an observed surface from an inferred underlying structure.","questions":[{"text":"Which hand or foot, side, and digit contain this eponychium?","id":"proximal-ventral-location-q01","kind":"boundary"},{"text":"Which visible or histological landmarks support its identification beneath the proximal nail fold?","id":"proximal-ventral-location-q02","kind":"definition"}]}]}]},{"id":"fold-cuticle-plate-relationships","name":"Fold, cuticle, and plate relationships","description":"Represent the specific tissue interfaces that give the eponychium its anatomical role.","layers":[{"id":"epithelium-and-cuticle","name":"Epithelium and cuticle","description":"Separate the epithelial region from its associated cornified material.","findings":[{"id":"cuticle-production-boundary","name":"Cuticle production boundary","description":"The working model associates cuticle formation with the ventral proximal-fold epithelium and fold tip; evidence should specify which component is described.","questions":[{"text":"Does the evidence concern epithelial tissue, cornified cuticle, or both?","id":"cuticle-production-boundary-q01","kind":"boundary"},{"text":"How does the source attribute cuticle formation to the eponychium and adjacent fold tip?","id":"cuticle-production-boundary-q02","kind":"provenance"}]}]},{"id":"neighbouring-nail-structures","name":"Neighbouring nail structures","description":"Locate the eponychium relative to structures that need separate models.","findings":[{"id":"proximal-interface-map","name":"Proximal interface map","description":"A local anatomical map should distinguish the fold lining, adherent cuticle, nail plate, and deeper matrix region.","questions":[{"text":"Where does the identified tissue meet the proximal nail plate or associated cuticle?","id":"proximal-interface-map-q01","kind":"boundary"},{"text":"What evidence separates it from the matrix, nail bed, and whole proximal nail fold?","id":"proximal-interface-map-q02","kind":"boundary"}]}]}]},{"id":"proximal-interface-condition","name":"Proximal interface condition","description":"Capture local continuity and tissue changes without inferring a diagnosis.","layers":[{"id":"interface-continuity","name":"Interface continuity","description":"Describe the visible cuticle-plate junction and any local disruption.","findings":[{"id":"localized-interface-disruption","name":"Localized interface disruption","description":"Record apparent gaps with their location and affected tissue; visible appearance alone does not establish functional barrier competence.","questions":[{"text":"Is the proximal cuticle-plate interface visibly continuous, interrupted, or obscured?","id":"localized-interface-disruption-q01","kind":"measurement"},{"text":"Does the interruption involve cuticle alone, fold tissue, or an unresolved combination?","id":"localized-interface-disruption-q02","kind":"boundary"}]}]},{"id":"local-tissue-and-symptoms","name":"Local tissue and symptoms","description":"Separate directly observed changes from symptoms and diagnostic interpretations.","findings":[{"id":"localized-condition-record","name":"Localized condition record","description":"Changes around the proximal fold require precise localization because the eponychial epithelium may not be directly visible.","questions":[{"text":"Which redness, swelling, fissures, erosions, or bleeding are directly observed, and in which tissue?","id":"localized-condition-record-q01","kind":"measurement"},{"text":"What pain or tenderness is reported at this site, and when did it begin?","id":"localized-condition-record-q02","kind":"provenance"},{"text":"Which findings remain observations requiring assessment in a neighbouring clinical model?","id":"localized-condition-record-q03","kind":"boundary"}]}]}]},{"id":"exposure-and-interaction","name":"Exposure and interaction","description":"Relate local contact events and proposed actions to the specific proximal nail tissue involved.","layers":[{"id":"contact-history","name":"Contact history","description":"Document mechanical and chemical contact at the proximal fold interface.","findings":[{"id":"proximal-fold-contact-event","name":"Proximal-fold contact event","description":"Contact history should identify the affected tissue, timing, and evidence rather than presuming that an exposure caused a change.","questions":[{"text":"What cutting, pushing, picking, product application, or other contact occurred at this nail base?","id":"proximal-fold-contact-event-q01","kind":"provenance"},{"text":"Was the contact with adherent cuticle, proximal-fold tissue, or an uncertain target?","id":"proximal-fold-contact-event-q02","kind":"boundary"},{"text":"How does the contact time relate to the first documented local change?","id":"proximal-fold-contact-event-q03","kind":"measurement"}]}]},{"id":"proposed-action-assessment","name":"Proposed action assessment","description":"Determine whether the proposed target and action are sufficiently understood.","findings":[{"id":"tissue-specific-action-boundary","name":"Tissue-specific action boundary","description":"The model supports identifying the target and unresolved risks; procedural authorization and clinical treatment belong to the relevant care model.","questions":[{"text":"What exact tissue would the proposed action contact or remove?","id":"tissue-specific-action-boundary-q01","kind":"action"},{"text":"What additional examination is needed if living fold tissue cannot be distinguished from cuticle?","id":"tissue-specific-action-boundary-q02","kind":"action"}]}]}]},{"id":"observation-and-follow-up","name":"Observation and follow-up","description":"Make eponychial observations interpretable across methods and time.","layers":[{"id":"visibility-and-method","name":"Visibility and method","description":"State what the examination actually resolves at the proximal nail fold.","findings":[{"id":"eponychial-observation-limits","name":"Eponychial observation limits","description":"An observation must distinguish directly resolved tissue from anatomy inferred beneath the fold.","questions":[{"text":"Does the method resolve eponychial epithelium, only the external fold and cuticle, or neither?","id":"eponychial-observation-limits-q01","kind":"measurement"},{"text":"What polish, artificial nail material, debris, lighting, or viewing angle obscures the proximal interface?","id":"eponychial-observation-limits-q02","kind":"provenance"}]}]},{"id":"matched-temporal-comparison","name":"Matched temporal comparison","description":"Track changes at the same digit and proximal interface.","findings":[{"id":"documented-local-change","name":"Documented local change","description":"Comparisons should match anatomical location and examination conditions before describing improvement or deterioration.","questions":[{"text":"Are the observations from the same digit and equivalent proximal-fold locations?","id":"documented-local-change-q01","kind":"boundary"},{"text":"What change in defect extent, interface continuity, or local symptoms is supported by comparable observations?","id":"documented-local-change-q02","kind":"measurement"},{"text":"What unresolved change requires follow-up examination rather than an inferred recovery or diagnosis?","id":"documented-local-change-q03","kind":"action"}]}]}]},{"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 eponychium this model covers, and on what evidence?","id":"evidence-confidence-notes-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 eponychium 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 eponychium 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 eponychium this model covers, and on what evidence?","id":"evidence-neighbours-q01","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Describe the eponychium and its role in sealing the nail fold.","Explain hygiene practices for nail care from reputable health sources."],"mustNot":["Cut, push or remove the eponychium during a manicure performed by a machine without the client's consent.","Diagnose nail fold infections or skin disease from images alone.","Share images of a person's hands that identify them without consent."],"requiresHuman":["Treating an infected or injured nail fold."]},"ethics":{"considerations":["Damaging this seal invites painful infection, often from unsafe salon practice.","Clients trust nail workers with their safety."],"affectedParties":["Salon clients","Nail technicians","People with diabetes or poor circulation"]},"owners":{"steward":"Nobody: part of a person's body; the person and their clinician answer for its care.","roles":[],"masterSystems":[]},"relations":[{"target":"Q112826975","type":"parent","note":"registry parent class"},{"target":"Q66543708","type":"parent","note":"registry parent class"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.eponychium","Wikidata: Q788191 (https://www.wikidata.org/wiki/Q788191)"]},"properties":{"applicability":"required","items":["Anatomical referent: ventral proximal-fold epithelium | cuticle usage | broader proximal-fold usage | unresolved","Digit and laterality: person or specimen; left or right; hand or foot; digit 1-5","Evidence of tissue identity: surface inspection | magnified imaging | histology | anatomical description | unresolved","Observed proximal interface continuity: apparently continuous | focally interrupted | extensively interrupted | obscured | not assessed","Local tissue appearance: separately recorded redness, swelling, fissuring, erosion, bleeding, or no visible change; unknown permitted","Visible defect extent: mm, with defined endpoints, image scale, and affected tissue","Local symptoms: pain or tenderness reported | absent by report | not assessed; onset and location recorded separately","Recent proximal-fold manipulation: linked event describing cutting, pushing, picking, chemical exposure, or other contact; time and certainty"]},"recognition":{"applicability":"required","items":["The thin skin fold at the base of the nail, ending in the cuticle over the nail plate."]},"capabilities":{"applicability":"required","items":["Locate and annotate the eponychial region on an identified digit while marking uncertain tissue boundaries.","Reconcile anatomical labels across records without silently equating eponychium, cuticle, and proximal nail fold.","Record visible proximal nail-interface changes and distinguish observations from reported symptoms.","Compare matched observations of the same digit over time.","Identify when a proposed manipulation targets uncertain or potentially living tissue and route the decision for qualified assessment."]},"hazards":{"applicability":"required","items":["Cutting or tearing it can lead to paronychia, an infection of the nail fold.","Shared tools can spread fungal and bacterial infection."]},"interfaces":{"applicability":"required","items":["Terminologia Anatomica, issued by the Federative International Programme for Anatomical Terminology, provides standardized terminology for human nail anatomy."]},"context":{"applicability":"required","items":["The eponychium is encountered at the proximal margin of human fingernails and toenails during anatomical study, nail care and clinical examination.","Its relationship to the nail fold and cuticle helps describe the protective barrier around the emerging nail plate and local changes in tissue condition."]}},"sources":[{"title":"Wikidata item Q788191: eponychium","url":"https://www.wikidata.org/wiki/Q788191","note":"identity and sense of the item"},{"title":"Wikipedia: Eponychium","url":"https://en.wikipedia.org/wiki/Eponychium","note":"general description of the item"}],"openQuestions":["Which anatomical meaning did the registry intend: ventral proximal-fold epithelium, cuticle, or a broader proximal nail-fold region?","Should this registry entry cover human anatomy only, or include explicitly mapped homologous structures in other species?","Which noninvasive examination methods can reliably distinguish eponychial tissue from adjacent fold tissue and cuticle?","What reference ranges and measurement protocols, if any, support comparisons across digits, ages, and fingernails versus toenails?","Which evidence-based findings should trigger clinical assessment, and which visible interface features have demonstrated relationships to barrier function?"],"resources":{"spec":"/models/things/publications/thing-q788191/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q788191/spec.json"],"providers":["Codex"],"researchStatus":"unreviewed","generatedAt":"2026-09-12T09:31:09Z","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 2026-10-07T10:10:32+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}