{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.lambda","code":"thing-q4927079","url":"https://ver.cy/models/thing/q4927079/","name":"lambda","alternateNames":[],"kind":"thing","status":"published","version":"0.2.0-wave.56","language":"en","classifiers":{"family":"Thing Registry","category":"Physical world and living systems","entryKind":"thing","plane":"PHY","domain":["PHY.LIV"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"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.","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.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["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"],"structure":{"bundles":[{"id":"landmark","name":"Landmark","description":"What and where it is.","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.","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.","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.","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"}]}]}]}]},"agentConduct":{"may":["Explain the landmark and cite the anatomical reference used.","Help learners locate it on models and images."],"mustNot":["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."],"requiresHuman":["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."],"affectedParties":["Patients and infants","Descendant communities of studied remains","Students"]},"owners":{"steward":"Nobody: an anatomical landmark; anatomical terminology bodies maintain its name.","roles":[],"masterSystems":["Terminologia Anatomica"]},"relations":[{"target":"Q66603128","type":"parent","note":"registry parent class"},{"target":"craniometric point","type":"related"},{"target":"bregma","type":"related","note":"the landmark at the other end of the sagittal suture"},{"target":"sagittal suture","type":"contains","note":"one of the sutures that meet there"},{"target":"lambdoid suture","type":"contains","note":"the other suture that meets there"},{"target":"lambda (letter)","type":"related","note":"the Greek letter it is named after"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.lambda","Wikidata: Q4927079 (https://www.wikidata.org/wiki/Q4927079)","Wikidata: Q4927079 registry item"]},"properties":{"applicability":"required","items":["kind: craniometric landmark note","location: posterior skull midline note","bones meeting: two parietal bones and the occipital bone note"]},"recognition":{"applicability":"required","items":["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","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."]},"capabilities":{"applicability":"required","items":["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"]},"hazards":{"applicability":"required","items":["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"]},"interfaces":{"applicability":"required","items":["Terminologia Anatomica, the international anatomical terminology"]},"context":{"applicability":"required","items":["lambda in the adult skull","posterior fontanelle in the infant","lambda as a reference point in animal stereotaxy"]}},"sources":[{"title":"Wikidata item Q4927079: lambda","url":"https://www.wikidata.org/wiki/Q4927079","note":"identity and sense of the item"},{"title":"Wikipedia: Lambda (anatomy)","url":"https://en.wikipedia.org/wiki/Lambda_%28anatomy%29","note":"general description of the item"}],"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?"],"resources":{"spec":"/models/things/publications/thing-q4927079/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q4927079/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-10-06T10:45:08Z","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 2026-10-09T07:30:02+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}