{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.endoneurium","code":"thing-q763062","url":"https://ver.cy/models/thing/q763062/","name":"endoneurium","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.LIV"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"The endoneurium is the delicate connective tissue within peripheral nerve fascicles that surrounds individual nerve fibres and their associated Schwann cells, supporting them within an extracellular matrix containing small blood vessels.","purpose":"Enable an agent to recognise endoneurium, assess its local structural and microenvironmental state, and determine which observations or interventions require further evidence.","scope":{"in":["Anatomical identification and localisation within a specified peripheral nerve fascicle","Endoneurial extracellular matrix, stromal cells and relationships to nerve fibre-Schwann cell units","Local interstitial conditions and relationships to endoneurial microvascular exchange","Observed oedema, fibrosis, inflammation and disruption of endoneurial architecture","Sampling, measurement and longitudinal comparison of defined endoneurial regions"],"out":["The whole peripheral nerve and its overall sensory or motor function","Perineurium enclosing fascicles and epineurium surrounding or separating them","Axonal physiology, myelin and Schwann cell biology as independent subjects","Complete vascular anatomy and endothelial biology","Whole-organism taxonomy, population status and conservation","Disease diagnosis, surgical repair selection and treatment protocols"],"boundaries":[]},"distinguishingFeatures":["Occupies the connective tissue spaces within a peripheral nerve fascicle, rather than forming the fascicle's enclosing perineurial sleeve.","Shows delicate collagenous support around nerve fibres rather than the coarser external and interfascicular connective tissue assigned to epineurium.","Must be distinguished from the axon, Schwann cell, myelin sheath and Schwann cell basal lamina; adjacent structures are not interchangeable tissue identities.","Can be identified around both myelinated and unmyelinated nerve fibre arrangements; visible myelin is not a prerequisite.","Contains microvessels, but the endoneurial matrix itself is not the endothelial blood-nerve barrier."],"structure":{"bundles":[{"id":"intrafascicular-identity","name":"Intrafascicular identity","description":"Establishes where endoneurium begins and ends in the observed nerve.","layers":[{"id":"nerve-and-fascicle-location","name":"Nerve and fascicle location","description":"Anchors each observation to a defined anatomical tissue instance.","findings":[{"id":"localised-endoneurial-region","name":"Localised endoneurial region","description":"A usable record identifies the nerve segment, fascicle and sampled region rather than assigning a whole-nerve observation to endoneurium.","questions":[{"text":"Which species, specimen, nerve segment and fascicle contain this endoneurial region?","id":"localised-endoneurial-region-q01","kind":"provenance"},{"text":"What anatomical landmarks establish that the observed tissue lies within the fascicle?","id":"localised-endoneurial-region-q02","kind":"boundary"}]}]},{"id":"adjacent-sheath-boundaries","name":"Adjacent sheath boundaries","description":"Separates endoneurial connective tissue from neighbouring coverings and nerve fibre components.","findings":[{"id":"resolved-tissue-identity","name":"Resolved tissue identity","description":"Identification must distinguish interstitial connective tissue from perineurium, epineurium and the Schwann cell-axon unit.","questions":[{"text":"Which morphological observations distinguish this region from perineurium and epineurium?","id":"resolved-tissue-identity-q01","kind":"definition"},{"text":"Are Schwann cell basal lamina, myelin and axoplasm excluded from the endoneurial matrix annotation?","id":"resolved-tissue-identity-q02","kind":"boundary"}]}]}]},{"id":"matrix-and-fibre-support","name":"Matrix and fibre support","description":"Describes the connective tissue architecture around nerve fibre units.","layers":[{"id":"collagen-architecture","name":"Collagen architecture","description":"Records fibril organisation at a stated anatomical scale.","findings":[{"id":"fibrillar-support-pattern","name":"Fibrillar support pattern","description":"A primary ultrastructural study reported longitudinal and interwoven collagen arrangements around nerve fibres; applicability must remain tied to the studied tissue and method. [Three-dimensional architecture of the endoneurium](https://pubmed.ncbi.nlm.nih.gov/3566468/).","questions":[{"text":"What collagen orientation and organisation are visible relative to the nerve fibre axis?","id":"fibrillar-support-pattern-q01","kind":"measurement"},{"text":"Which species, nerve and preparation support interpreting this pattern as expected architecture?","id":"fibrillar-support-pattern-q02","kind":"provenance"}]}]},{"id":"cell-and-fibre-relationships","name":"Cell and fibre relationships","description":"Maps connective tissue around myelinated units, unmyelinated arrangements and local stromal cells.","findings":[{"id":"resolved-supporting-elements","name":"Resolved supporting elements","description":"Cell and matrix assignments require evidence that separates stromal elements from Schwann cells, vascular cells and axons.","questions":[{"text":"How does the matrix relate spatially to myelinated fibres and unmyelinated axons within Schwann cell arrangements?","id":"resolved-supporting-elements-q01","kind":"boundary"},{"text":"Which morphological or molecular evidence supports each assigned stromal or immune cell identity?","id":"resolved-supporting-elements-q02","kind":"measurement"}]}]}]},{"id":"endoneurial-microenvironment","name":"Endoneurial microenvironment","description":"Connects interstitial observations to vascular exchange and local physical conditions.","layers":[{"id":"microvascular-exchange-interface","name":"Microvascular exchange interface","description":"Identifies endoneurial vessels and the evidence available about their barrier function.","findings":[{"id":"attributed-barrier-evidence","name":"Attributed barrier evidence","description":"Human tissue research identifies tight-junction-forming endoneurial microvessels as the blood-nerve barrier; vessel identity and demonstrated permeability should be recorded separately. [In situ molecular characterization of endoneurial microvessels](https://pubmed.ncbi.nlm.nih.gov/31119823/).","questions":[{"text":"Does the observation concern endoneurial vascular endothelium or the surrounding perineurial interface?","id":"attributed-barrier-evidence-q01","kind":"boundary"},{"text":"Was exchange assessed functionally with a specified tracer and time interval, or inferred only from structure and markers?","id":"attributed-barrier-evidence-q02","kind":"measurement"}]}]},{"id":"interstitial-fluid-and-pressure","name":"Interstitial fluid and pressure","description":"Separates measured fluid conditions from morphological surrogates.","findings":[{"id":"qualified-fluid-state","name":"Qualified fluid state","description":"Interstitial widening, water content and fluid pressure are different observations and should not substitute for one another.","questions":[{"text":"What evidence distinguishes endoneurial fluid accumulation from fixation shrinkage or sectioning spaces?","id":"qualified-fluid-state-q01","kind":"measurement"},{"text":"If pressure was measured, what reference, probe method and physiological conditions define the result?","id":"qualified-fluid-state-q02","kind":"measurement"}]}]}]},{"id":"injury-and-remodelling","name":"Injury and remodelling","description":"Tracks changes in endoneurial continuity, matrix and cellular response.","layers":[{"id":"structural-disruption","name":"Structural disruption","description":"Localises interruption of the endoneurial architecture relative to a documented lesion.","findings":[{"id":"mapped-continuity-loss","name":"Mapped continuity loss","description":"Continuity assessments specify the structure followed, the spatial extent examined and the resolution available.","questions":[{"text":"Which endoneurial structures remain continuous across the examined lesion region?","id":"mapped-continuity-loss-q01","kind":"measurement"},{"text":"Does a reported preserved endoneurial tube mean connective tissue architecture, Schwann cell basal lamina or another explicitly identified structure?","id":"mapped-continuity-loss-q02","kind":"definition"}]}]},{"id":"matrix-and-cellular-response","name":"Matrix and cellular response","description":"Records time-dependent stromal changes without assigning an unsupported cause.","findings":[{"id":"qualified-remodelling-state","name":"Qualified remodelling state","description":"Matrix expansion and cellular changes require matched comparisons and timing before they can support an interpretation of remodelling.","questions":[{"text":"How do matrix fraction and identified cell populations differ from a comparable reference region?","id":"qualified-remodelling-state-q01","kind":"measurement"},{"text":"What is the interval between the documented injury or exposure and tissue observation?","id":"qualified-remodelling-state-q02","kind":"provenance"},{"text":"What additional evidence is needed before linking these changes to impaired or successful nerve regeneration?","id":"qualified-remodelling-state-q03","kind":"action"}]}]}]},{"id":"endoneurial-observation-and-action","name":"Endoneurial observation and action","description":"Determines what specimen evidence can establish and what further work it supports.","layers":[{"id":"sampling-and-resolution","name":"Sampling and resolution","description":"Matches the endoneurial question to specimen preparation and observation scale.","findings":[{"id":"fit-for-question-observation","name":"Fit-for-question observation","description":"The record identifies whether the method resolves fascicular location, collagen architecture, cellular identity or ultrastructural boundaries.","questions":[{"text":"Which preparation, stain, imaging resolution and section orientation produced this observation?","id":"fit-for-question-observation-q01","kind":"provenance"},{"text":"Does the sampled field adequately represent the endoneurial region relevant to the question?","id":"fit-for-question-observation-q02","kind":"boundary"}]}]},{"id":"evidence-directed-next-step","name":"Evidence-directed next step","description":"Connects unresolved endoneurial observations to proportionate follow-up.","findings":[{"id":"bounded-action-inference","name":"Bounded action inference","description":"An agent can recommend further characterisation while keeping decisions about invasive sampling or nerve treatment connected to the broader clinical or experimental context.","questions":[{"text":"Which additional observation would resolve the specific uncertainty: serial sections, ultrastructure, cell identification or functional exchange measurement?","id":"bounded-action-inference-q01","kind":"action"},{"text":"What broader functional evidence and procedural authority are required before this endoneurial finding informs an invasive intervention?","id":"bounded-action-inference-q02","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 endoneurium this model covers, and on what evidence?","id":"evidence-confidence-notes-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 endoneurium 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 endoneurium 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 endoneurium 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 endoneurium this model covers, and on what evidence?","id":"evidence-neighbours-q01","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Describe the endoneurium and its role from anatomy sources.","Annotate nerve tissue images for teaching or research when lawfully obtained."],"mustNot":["Interpret a person's nerve biopsy or test as a diagnosis.","Use human tissue outside the consent under which it was taken.","Advise treatment for nerve injury or neuropathy as if it were medical care."],"requiresHuman":["Discussing findings in a person's own biopsy or nerve test report."]},"ethics":{"considerations":["Human tissue comes from people with rights over its use.","Nerve conditions affect quality of life; care must be accurate."],"affectedParties":["Patients and tissue donors","People with neuropathy","Researchers"]},"owners":{"steward":"Nobody owns it as a structure; the clinic or biobank answers for a stored sample.","roles":[],"masterSystems":["Biobank sample registers"]},"relations":[{"target":"Q66511554","type":"parent","note":"registry parent class"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.endoneurium","Wikidata: Q763062 (https://www.wikidata.org/wiki/Q763062)"]},"properties":{"applicability":"required","items":["Anatomical context: Species, individual or specimen, named nerve, side, segment and fascicle","Boundary identification: Confirmed intrafascicular; probable; indeterminate; boundary disrupted","Matrix area fraction: Percentage of a defined region, with stain, segmentation method and exclusions recorded","Collagen organisation: Longitudinal; interwoven; mixed; disorganised; unresolved, with section orientation","Interstitial expansion: Absent; suspected; demonstrated; indeterminate, with supporting method","Endoneurial fluid pressure: mmHg or kPa, with reference pressure, method and physiological conditions","Microvascular barrier evidence: Not assessed; structural evidence only; functional restriction demonstrated; leakage demonstrated; indeterminate","Endoneurial continuity: Preserved; focally disrupted; extensively disrupted; unresolved at available resolution","Cellular response: Cell identities, densities in cells/mm² or cells/mm³, distribution and identification confidence"]},"recognition":{"applicability":"required","items":["Fine connective tissue between individual nerve fibres in a microscope section.","Lies inside the perineurium that wraps each nerve fascicle."]},"capabilities":{"applicability":"required","items":["Locate and annotate endoneurial regions in peripheral nerve specimens.","Compare matrix organisation and interstitial spacing across matched regions or time points.","Associate local microvascular observations with explicitly measured barrier or perfusion evidence.","Map structural disruption, cellular responses and matrix remodelling around a documented nerve injury.","Select an observation method that can resolve a specific uncertainty about endoneurial structure or state.","Flag when tissue evidence is insufficient to infer nerve function, regenerative success or an appropriate intervention."]},"hazards":{"applicability":"required","items":["Damage or swelling within the endoneurium occurs in some neuropathies.","Nerve injury can cause lasting loss of feeling or movement."]},"interfaces":{"applicability":"required","items":["Terminologia Histologica, issued by the Federative International Committee on Anatomical Terminology, provides standard histological terminology for endoneurium."]},"context":{"applicability":"required","items":["Endoneurium is encountered within peripheral nerve fascicles, where delicate connective tissue surrounds individual nerve fibres and their associated Schwann cells.","It is examined in anatomy, histology and nerve pathology to understand local support structures and changes associated with nerve injury or disease."]}},"sources":[{"title":"Wikidata item Q763062: endoneurium","url":"https://www.wikidata.org/wiki/Q763062","note":"identity and sense of the item"},{"title":"Wikipedia: Endoneurium","url":"https://en.wikipedia.org/wiki/Endoneurium","note":"general description of the item"}],"openQuestions":["Which anatomical convention should govern whether endoneurium denotes only connective tissue or the broader intrafascicular compartment in imported records?","Which species-, age- and nerve-specific reference ranges are supported for matrix fraction, cellular density and endoneurial fluid pressure?","How should endoneurial boundaries be represented at nerve roots, ganglia, terminal branches and specialised sensory endings?","What terminology reliably distinguishes endoneurial connective tissue continuity from persistent Schwann cell basal lamina after injury?","Which validated measurements distinguish reversible interstitial changes from persistent fibrosis and predict meaningful functional recovery?"],"resources":{"spec":"/models/things/publications/thing-q763062/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q763062/spec.json"],"providers":["Codex"],"researchStatus":"unreviewed","generatedAt":"2026-09-12T09:29:53Z","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 2026-10-09T07:30:03+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}