spinal cord
Enable an AI agent to recognise a spinal cord, assess its anatomical and functional state, and identify actions whose prerequisites, authority and risks require evaluation.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
Researched by: Codex + Grok
Purpose and description
Enable an AI agent to recognise a spinal cord, assess its anatomical and functional state, and identify actions whose prerequisites, authority and risks require evaluation.
The spinal cord is the caudal continuation of the central nervous system within the vertebral canal, a segmented cylindrical tract of grey and white matter that conducts ascending sensory and descending motor signals and houses the internuncial circuitry of spinal reflexes.
It can be Locate and annotate cord boundaries, segments and abnormalities in images or specimens.; Associate examination and physiological observations with candidate cord regions while recording alternative localisations.; Compare serial observations for changes in morphology, lesion extent and attributable function.; Identify missing evidence needed to distinguish intrinsic cord pathology from effects of neighbouring structures.; Flag recorded cord compromise for review under an applicable clinical escalation policy.; Represent proposed assessments or interventions together with their target, prerequisites, authorised decision-maker and monitoring needs..
Distinguishing features
Identify central nervous tissue organised around a longitudinal cord axis, rather than the bone, discs and ligaments of the vertebral column.
Distinguish the cord's continuous neural tissue from the separate nerve roots of the cauda equina; a location inside the spinal canal alone is insufficient.
Establish continuity with the brainstem and locate the transition using landmarks appropriate to the species and developmental stage.
Look for intrinsic grey and white matter organisation and segmental root attachments when the available imaging, specimen or anatomical evidence can resolve them.
Distinguish the conus medullaris, which is the terminal cord region, from the continuing filum terminale and adjacent descending roots.
Scope
+ Identity, anatomical extent and boundaries of an individual spinal cord
+ Cord segments, intrinsic grey and white matter, and their spatial relationships
+ Motor, sensory, autonomic and reflex functions attributable to the cord
+ Intrinsic tissue condition, lesions and their distribution
+ Cord responses to injury, disease, compression and intervention
+ Evidence and uncertainty supporting assessment of cord state
- Vertebrae, intervertebral discs, spinal joints and mechanical stability as structures in their own right
- Brain and brainstem anatomy beyond their boundary and functional relationship with the cord
- Spinal nerve roots, dorsal root ganglia, cauda equina and peripheral nerves as separate structures
- Meninges, cerebrospinal fluid spaces and supplying vessels as independently modelled structures
- Whole-person disability, rehabilitation goals and participation outcomes
- Complete disease models, procedural protocols and treatment selection
Characteristics
- Biological and observation context
- Species; developmental stage; living subject, specimen or reconstructed representation Controls which anatomical expectations and functional assessments apply.
- Anatomical extent
- Rostral boundary and caudal termination linked to named landmarks and supporting observations Establishes which tissue belongs to this cord and supports recognition of atypical position.
- Segment-to-vertebral correspondence
- Cord segment mapped to vertebral landmark, with method and uncertainty Prevents cord segments and similarly named vertebral levels from being treated as interchangeable.
- Cord dimensions
- Length and diameters in mm; cross-sectional area in mm²; each with location, acquisition method and reference context Supports assessment of local enlargement, narrowing or change without assuming one normal size.
- Intrinsic tissue appearance
- Observed grey and white matter pattern, signal or histological appearance; modality and assessability recorded Separates what was observed from explanations such as oedema, degeneration or inflammation.
- Lesion distribution
- Longitudinal extent, side, cross-sectional compartment and relationship to cord boundaries Connects an abnormality to the neural structures and functions it could affect.
- Functional status
- Motor, sensory, autonomic and reflex findings, each localised and qualified by test validity and attribution confidence Records cord-related function without equating every deficit with a proven cord lesion.
- External constraint and vascular dependency
- Relationships to compressing structures, surrounding fluid spaces and relevant blood supply Represents influences on cord state while preserving ownership by neighbouring models.
- State trajectory
- New, stable, improving, worsening, fluctuating or indeterminate over a specified interval Makes change explicit and supports reassessment priorities.
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.spinal-cord
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 11 findings · 21 questions.
Cord identity and localisation Establishes which spinal cord is represented and how its regions are located.
Cord recognition and localisation depend on biological context and must distinguish neural segments from skeletal landmarks.
Anatomical boundaries
Identifies the cord's extent and interfaces with adjacent neural and supporting structures.
Cord extent and terminal boundary
Records the observed cord extent and the evidence separating its terminal region from roots and supporting tissue.
- What species, developmental stage and anatomical landmarks define the rostral and caudal boundaries of this cord? boundary
- Which image, examination of a specimen or other observation supports identification of the conus and its distinction from adjacent roots and filum? provenance
Segmental reference
Maintains explicit correspondence between cord regions, root attachments and external landmarks.
Cord segment location
Records localisation without conflating cord segment, vertebral level and examination-derived neurological level.
- Does each reported level denote a cord segment, a vertebral landmark or an examination-derived neurological level? definition
- How was correspondence between these levels established, and what uncertainty remains? provenance
Intrinsic cord architecture Represents cord geometry and the internal organisation visible to the available methods.
A cord can retain gross continuity while having local deformation or damage to specific internal compartments.
Cord geometry
Describes dimensions, contour and continuity along the cord.
Regional shape and size
Records location-specific measurements and morphological observations against an appropriate reference.
- What cord diameters or cross-sectional areas were measured, at which locations and in which acquisition planes? measurement
- What evidence distinguishes expected regional shape from focal swelling, flattening, thinning or discontinuity? provenance
Neural compartments
Describes assessable grey matter, white matter and central canal relationships.
Internal compartment integrity
Records which internal structures are resolved and where their appearance is altered.
- Which grey matter, white matter or central canal features can the observation method actually distinguish? boundary
- Where are altered signal, cavitation or architectural disruption observed, and what are their measured extents? measurement
Cord function and localisation Connects observed function to possible cord pathways and segmental circuits.
Structural appearance alone does not establish functional integrity, and functional deficits can arise outside the cord.
Longitudinal pathway function
Records motor and sensory observations relevant to transmission through the cord.
Motor and sensory pattern
Preserves the distribution and validity of findings before inferring a cord localisation.
- What motor and sensory findings were observed by side, body region and sensory modality, using which examination or physiological test? measurement
- What evidence supports a cord localisation, and what brain, root or peripheral nerve explanations remain unresolved? boundary
Segmental and autonomic function
Captures reflex and autonomic observations whose interpretation depends on cord circuits and connected structures.
Reflex and autonomic pattern
Records relevant reflexes and autonomic effects without attributing whole-organ dysfunction solely to the cord.
- Which reflex, bladder, bowel, sexual or cardiovascular observations are available, and when and how were they obtained? measurement
- Which components of these observations are plausibly attributable to cord circuits, and which depend on roots, peripheral nerves, organs or confounding conditions? boundary
Cord pathology and dependencies Localises cord abnormalities and relates them to potential intrinsic and external mechanisms.
Similar deficits may accompany different tissue processes or external constraints, requiring separate observations and causal hypotheses.
Intrinsic lesion pattern
Describes abnormalities within cord tissue before assigning their cause.
Lesion extent and interpretation
Separates observed lesion features from proposed mechanisms and diagnoses.
- What is the abnormality's longitudinal extent, laterality and cross-sectional distribution within the cord? measurement
- Which observations support each proposed mechanism, and which interpretations remain unconfirmed? provenance
External effects on cord
Links cord state to surrounding structures, fluid spaces and vascular dependencies.
Compression, tethering and perfusion context
Records evidence of external constraint or vascular contribution while keeping adjacent entities distinct.
- Which adjacent structure or vascular dependency is implicated, and where does it relate to the affected cord region? boundary
- What evidence supports compression, tethering or impaired perfusion as a contributor rather than an incidental association? provenance
Cord course and action constraints Tracks cord state over time and defines what must be established before an action is considered.
Decisions depend on the timing and reliability of cord findings, the action's actual target and the possibility of further neurological harm.
Temporal cord state
Compares anatomical and functional observations across time.
Cord change and comparability
Records whether apparent progression or recovery is supported by comparable observations.
- How have cord morphology and attributable neurological findings changed relative to a dated baseline? measurement
- Do differences in imaging, examination conditions, sedation or assessability limit interpretation of that change? provenance
Assessment and intervention gates
Records the target, evidence requirements and authority for proposed cord-related actions.
Cord action prerequisites
Makes action eligibility reviewable without embedding a universal treatment protocol.
- Does the proposed action target cord tissue, a compressing structure or another dependency, and what localisation and state evidence must be established first? action
- Which authorised clinical pathway governs the action, its urgency and monitoring for neurological change? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Kinds and varieties
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- cervical cord
- thoracic cord
- lumbar cord
- sacral cord
- coccygeal cord
- Which of these kinds and varieties hold for the sense of spinal cord this model covers, and on what evidence? provenance
What the second pass must settle
- Should the initial publication cover human spinal cords only, or provide species-specific extensions with separately researched anatomical expectations?
- Which reference methods and populations support interpretation of cord dimensions and conus position across developmental stages?
- Which neurological assessment standards should be supported, and how should their applicability and limitations be represented across traumatic and non-traumatic conditions?
- What evidence thresholds justify attributing motor, sensory or autonomic findings to the cord when brain, root and peripheral explanations coexist?
- Which reviewed clinical pathways should supply escalation and intervention prerequisites for particular cord conditions and care settings?