{
  "vercy": "1.0-draft",
  "publication": {
    "status": "research-draft",
    "adjudicationStatus": "unreviewed",
    "publishableCanonical": false,
    "generatedAt": "2026-10-06T10:45:08Z",
    "providers": [
      "Claude"
    ],
    "breadth": "written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify",
    "pass": 2,
    "wave": 56,
    "engine": "claude",
    "gate": {
      "passed": true,
      "version": "1.0",
      "at": "2026-10-09T07:30:02+00:00",
      "evidence": [
        "completeness 1.00",
        "sense: Wikidata description",
        "2 live sources",
        "review by codex: pass"
      ]
    }
  },
  "metaModel": {
    "id": "THING-Q4927079",
    "registryId": "vr.tr.lambda",
    "name": "lambda",
    "version": "0.2.0-wave.56",
    "entryKind": "thing",
    "family": "Thing Registry",
    "domain": [
      "PHY.LIV"
    ],
    "status": "research-draft"
  },
  "canonicalUrl": "https://ver.cy/models/thing/q4927079/",
  "model": {
    "registry_id": "vr.tr.lambda",
    "name": "lambda",
    "purpose": "Let an agent explain the lambda as a skull landmark, relay its position and uses in anatomy, anthropology and surgery from reference sources, and keep it apart from the Greek letter and other senses of the word.",
    "definition": "In anatomy, the lambda is the craniometric point on the back of the skull where the sagittal suture meets the lambdoid suture, between the two parietal bones and the occipital bone; in infants it marks the site of the posterior fontanelle.",
    "what_it_is_for": null,
    "affordances": [
      "locate the landmark on the skull",
      "explain its relation to the sutures and bones around it",
      "relate it to the posterior fontanelle",
      "explain its use as a reference point in measurement",
      "distinguish it from the bregma and other landmarks"
    ],
    "distinguishing_features": [
      "At the back of the skull, unlike the bregma at the front of the sagittal suture",
      "A point, not a suture or a bone",
      "The adult landmark, distinct from the infant fontanelle at the same site",
      "Anatomical sense, unlike the Greek letter it is named after"
    ],
    "appearance": "A point at the top of the back of the skull where the midline suture meets a pair of sutures running down and outward, together forming a shape like the Greek letter lambda.",
    "visual_identification": [
      "Junction of the midline sagittal suture with the lambdoid suture",
      "Located at the back of the skull, behind and below the vertex",
      "Upside-down V pattern of sutures like the letter lambda"
    ],
    "physical_properties": [
      {
        "quantity": "kind",
        "typical_range": "craniometric landmark",
        "unit": "note",
        "note": ""
      },
      {
        "quantity": "location",
        "typical_range": "posterior skull midline",
        "unit": "note",
        "note": ""
      },
      {
        "quantity": "bones meeting",
        "typical_range": "two parietal bones and the occipital bone",
        "unit": "note",
        "note": ""
      }
    ],
    "families_and_kinds": [
      "lambda in the adult skull",
      "posterior fontanelle in the infant",
      "lambda as a reference point in animal stereotaxy"
    ],
    "related_models": [
      {
        "relation": "is a kind of",
        "target": "craniometric point",
        "why": ""
      },
      {
        "relation": "is confused with",
        "target": "bregma",
        "why": "the landmark at the other end of the sagittal suture"
      },
      {
        "relation": "contains",
        "target": "sagittal suture",
        "why": "one of the sutures that meet there"
      },
      {
        "relation": "contains",
        "target": "lambdoid suture",
        "why": "the other suture that meets there"
      },
      {
        "relation": "is confused with",
        "target": "lambda (letter)",
        "why": "the Greek letter it is named after"
      }
    ],
    "identifiers": [
      {
        "scheme": "Wikidata",
        "value_or_pattern": "Q4927079",
        "note": "registry item"
      }
    ],
    "standards_and_regulation": [
      "Terminologia Anatomica, the international anatomical terminology"
    ],
    "failure_modes_and_hazards": [
      "Confusing lambda with bregma in measurement or surgical planning",
      "Extra sutural bones near the lambda can be mistaken for fractures",
      "Mixing up the anatomical and other senses of the word"
    ],
    "agent_conduct": {
      "may": [
        "Explain the landmark and cite the anatomical reference used.",
        "Help learners locate it on models and images."
      ],
      "must_not": [
        "Interpret a person's skull imaging as a diagnosis.",
        "Give surgical guidance for a specific patient.",
        "Handle human remains or images of them without regard to consent and dignity."
      ],
      "requires_human": [
        "Clinical interpretation of fontanelle or skull findings in a patient."
      ]
    },
    "ethics": {
      "considerations": [
        "Study of human remains requires respect and lawful provenance.",
        "Infant skull findings cause parental anxiety and need clinical, not automated, judgement."
      ],
      "affected_parties": [
        "Patients and infants",
        "Descendant communities of studied remains",
        "Students"
      ]
    },
    "owners": {
      "steward": "Nobody: an anatomical landmark; anatomical terminology bodies maintain its name.",
      "master_systems": [
        "Terminologia Anatomica"
      ]
    },
    "in_scope": [],
    "out_of_scope": [],
    "characteristics": []
  },
  "sources": [
    {
      "id": "wikidata",
      "title": "Wikidata item Q4927079: lambda",
      "url": "https://www.wikidata.org/wiki/Q4927079",
      "url_status": "live",
      "what_it_supports": "identity and sense of the item",
      "checked_by": "wikidata-api"
    },
    {
      "id": "wikipedia-en",
      "title": "Wikipedia: Lambda (anatomy)",
      "url": "https://en.wikipedia.org/wiki/Lambda_%28anatomy%29",
      "url_status": "live",
      "what_it_supports": "general description of the item",
      "checked_by": "wikidata-api sitelink"
    }
  ],
  "structure": {
    "bundles": [
      {
        "id": "landmark",
        "name": "Landmark",
        "description": "What and where it is.",
        "rationale": "A landmark is defined by the structures that meet at it.",
        "layers": [
          {
            "id": "position",
            "name": "Position",
            "description": "Location on the skull.",
            "findings": [
              {
                "id": "position-finding",
                "name": "Position",
                "description": "Location on the skull.",
                "questions": [
                  {
                    "text": "Where on the skull is the lambda, and which sutures meet there?",
                    "kind": "definition"
                  },
                  {
                    "text": "Which bones border it?",
                    "kind": "definition"
                  }
                ]
              }
            ]
          },
          {
            "id": "name",
            "name": "Name",
            "description": "Origin of the term.",
            "findings": [
              {
                "id": "name-finding",
                "name": "Name",
                "description": "Origin of the term.",
                "questions": [
                  {
                    "text": "Why is the point named after the Greek letter?",
                    "kind": "provenance"
                  },
                  {
                    "text": "What is its entry in international anatomical terminology?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "development",
        "name": "Development",
        "description": "From fontanelle to landmark.",
        "rationale": "The same site changes from infancy to adulthood.",
        "layers": [
          {
            "id": "fontanelle",
            "name": "Fontanelle",
            "description": "The infant state.",
            "findings": [
              {
                "id": "fontanelle-finding",
                "name": "Fontanelle",
                "description": "The infant state.",
                "questions": [
                  {
                    "text": "How does the posterior fontanelle relate to the lambda?",
                    "kind": "boundary"
                  },
                  {
                    "text": "When does it usually close, according to clinical references?",
                    "kind": "measurement"
                  }
                ]
              }
            ]
          },
          {
            "id": "variation",
            "name": "Variation",
            "description": "Sutural bones and variants.",
            "findings": [
              {
                "id": "variation-finding",
                "name": "Variation",
                "description": "Sutural bones and variants.",
                "questions": [
                  {
                    "text": "Which sutural bones occur near the lambda?",
                    "kind": "provenance"
                  },
                  {
                    "text": "How are they told from fractures?",
                    "kind": "boundary"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "measurement",
        "name": "Measurement",
        "description": "Use as a reference point.",
        "rationale": "Its main practical use is as a fixed point for measuring and targeting.",
        "layers": [
          {
            "id": "craniometry",
            "name": "Craniometry",
            "description": "Anthropological measurement.",
            "findings": [
              {
                "id": "craniometry-finding",
                "name": "Craniometry",
                "description": "Anthropological measurement.",
                "questions": [
                  {
                    "text": "Which skull measurements use the lambda as an end point?",
                    "kind": "measurement"
                  },
                  {
                    "text": "Which reference defines those measurements?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          },
          {
            "id": "stereotaxy",
            "name": "Stereotaxy",
            "description": "Reference in surgery and research.",
            "findings": [
              {
                "id": "stereotaxy-finding",
                "name": "Stereotaxy",
                "description": "Reference in surgery and research.",
                "questions": [
                  {
                    "text": "How is the lambda used together with bregma as a reference in stereotaxic work?",
                    "kind": "action"
                  },
                  {
                    "text": "Is the context human or animal research?",
                    "kind": "boundary"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "disambiguation",
        "name": "Disambiguation",
        "description": "Other senses of lambda.",
        "rationale": "The word has many senses.",
        "layers": [
          {
            "id": "letter",
            "name": "Letter",
            "description": "The Greek letter.",
            "findings": [
              {
                "id": "letter-finding",
                "name": "Letter",
                "description": "The Greek letter.",
                "questions": [
                  {
                    "text": "Is the text about the anatomical point or the letter?",
                    "kind": "boundary"
                  },
                  {
                    "text": "Which entry fits the letter sense?",
                    "kind": "action"
                  }
                ]
              }
            ]
          },
          {
            "id": "other-uses",
            "name": "Other uses",
            "description": "Scientific and technical senses.",
            "findings": [
              {
                "id": "other-uses-finding",
                "name": "Other uses",
                "description": "Scientific and technical senses.",
                "questions": [
                  {
                    "text": "Which other scientific senses of lambda could be confused with this one?",
                    "kind": "boundary"
                  },
                  {
                    "text": "How should the reader be redirected?",
                    "kind": "action"
                  }
                ]
              }
            ]
          }
        ]
      }
    ]
  },
  "openQuestions": [
    "Should the posterior fontanelle be a separate linked entry?",
    "How should variation in its position between individuals be recorded?",
    "How should animal and human uses of the landmark be separated?"
  ],
  "statistics": {
    "bundles": 4,
    "layers": 8,
    "findings": 8,
    "questions": 16
  }
}