interventricular foramina
Enable an agent to identify the interventricular foramina, record their anatomy and evidence of patency, and support review of abnormalities affecting communication between the lateral and third ventricles.
Bundle → Layer → Finding → Questions Filled
6 bundles · 11 layers · 15 findings · 30 questions
Ventricular identity Establish which passages are represented and how side-specific observations belong to the registered pair.
Paired foramina
Bind observations to the registered anatomical kind and the appropriate side.
Pair and side
Record whether an observation concerns one foramen or the pair, retaining the single registry identity.
- Does this observation describe the left foramen, the right foramen or both? definition
- What image orientation or specimen label establishes the assigned side? provenance
Ventricular continuity
Identify each passage by the spaces it connects.
Endpoint confirmation
Trace continuity with the ipsilateral lateral ventricle and the third ventricle before accepting a label.
- Can both ventricular endpoints be followed through the available images or specimen? boundary
- Could the apparent opening instead be a septal fenestration, adjacent recess or surgically created communication? definition
Foraminal anatomy Describe the local margins, lumen geometry and relevant variation.
Local landmarks
Record relationships to the fornix, thalamus, choroid plexus and nearby vessels.
Margin recognition
Document visible local landmarks and any distortion; anatomical context is illustrated in [Three-dimensional anatomy of the central core](https://d1xe7tfg0uwul9.cloudfront.net/cbc-portal/wp-content/uploads/2013/07/02022011-JNS1.pdf).
- Which foraminal margins can be identified relative to the fornix and thalamus? boundary
- Do choroid plexus, vessels or displaced tissue obscure the lumen boundary? boundary
Lumen geometry
Capture dimensions and shape using explicit anatomical and acquisition conventions.
Dimension and asymmetry
Measure each assessable lumen independently and retain the method needed to interpret asymmetry.
- What are the minimum visible dimensions or cross-sectional area, and in which plane were they measured? measurement
- Does the apparent left-right difference persist when both sides are assessed with comparable orientation and resolution? measurement
- What species, age or altered-anatomy context limits comparison with a reference population? boundary
Patency and CSF transit Separate structural openness from evidence that cerebrospinal fluid traverses each passage.
Structural patency
Assess continuity and material occupying or narrowing the passage.
Lumen continuity
Express patency as an evidence-qualified assessment for each side.
- Is an uninterrupted lumen demonstrated, or is narrowing or occluding material visible? boundary
- What evidence distinguishes true occlusion from inadequate spatial resolution or an oblique section? provenance
Functional transit
Record flow evidence with its acquisition conditions and limitations.
Transit evidence
Avoid treating structural appearance as proof of adequate CSF transit or absent signal as proof of obstruction.
- Was transit through this specific foramen demonstrated directly, inferred indirectly or not assessed? measurement
- Which acquisition settings and technical limitations affect interpretation of the flow observation? provenance
- Does disagreement between structural and flow observations require additional assessment? action
Obstruction and ventricular effects Relate local abnormalities to their suspected causes and associated ventricular changes.
Local mechanism
Characterize whether the passage is occupied, compressed, narrowed or displaced.
Cause and contact
Record the proposed obstruction mechanism and link the responsible entity separately; lesion relationships are examined in [A classification of lesions around interventricular foramen and its clinical value](https://pmc.ncbi.nlm.nih.gov/articles/PMC4637789/).
- What observed entity occupies, compresses or distorts the foramen, and on which side? boundary
- Is the proposed causal relationship directly observed or inferred from proximity? provenance
Ventricular response
Link local patency assessments to the configuration of connected ventricular compartments.
Compartment pattern
Record associated ventricular changes without deriving a complete hydrocephalus diagnosis from foraminal appearance.
- What enlargement or interval change is present in each lateral ventricle and the third ventricle? measurement
- Is that pattern consistent with the proposed side and extent of foraminal obstruction? boundary
- What conflicting observations require review before attributing the ventricular changes to this foramen? action
Observation and altered anatomy Preserve evidence quality and distinguish native foraminal anatomy from changes following intervention.
Observation quality
Attach the acquisition and interpretive evidence necessary to assess a foraminal claim.
Local assessability
Record whether the specific foramen is resolved and which source supports its annotation.
- Which examination, sequence, image location or specimen observation supports the annotation? provenance
- Are resolution, motion and partial-volume effects compatible with the claimed lumen boundary? measurement
- Should the result remain indeterminate because the foramen is not adequately visualized? action
Intervention and follow-up
Track changes to the native passage and related ventricular communications over time.
Native versus created route
Distinguish a modified native foramen from an alternative communication, and compare follow-up observations under compatible conditions.
- Did the documented intervention modify this native foramen or create a separate CSF route? boundary
- What operative record or imaging evidence establishes the altered anatomy? provenance
- Which changes in lumen appearance, transit evidence and ventricular configuration can be supported on follow-up? measurement
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these check these first hold for the sense of interventricular foramina this model covers, and on what evidence? provenance
Identifiers and schemes
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these identifiers and schemes hold for the sense of interventricular foramina this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these real-world use hold for the sense of interventricular foramina this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these failure modes and hazards hold for the sense of interventricular foramina this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of interventricular foramina this model covers, and on what evidence? provenance
Classifiers Filled
- Family
- Thing Registry
- Category
- Physical world and living systems
- Entry kind
- thing
- Plane
- PHY
- Domain
- PHY.OBJ
What it is Filled
The interventricular foramina, also called the foramina of Monro, are paired openings in the brain that connect each lateral ventricle with the third ventricle and permit cerebrospinal fluid to pass between them.
In scope
- Identity of the paired foramina and side-specific observations
- Connections between each lateral ventricle and the third ventricle
- Local boundaries, neighbouring structures and anatomical variation
- Foraminal geometry and evidence of patency or obstruction
- Imaging visibility, measurement uncertainty and changes after intervention
Out of scope
- The ventricular system as a whole
- Cerebrospinal fluid production and absorption mechanisms
- Hydrocephalus diagnosis and treatment as a complete clinical model
- Colloid cysts, tumours and other obstructing lesions as independent entities
- Neurosurgical procedures, instruments and operative protocols
- Cardiac interventricular openings and septal defects
Why it exists Filled
Enable an agent to identify the interventricular foramina, record their anatomy and evidence of patency, and support review of abnormalities affecting communication between the lateral and third ventricles.
Distinguishing features Filled
- Each passage connects a lateral ventricle with the third ventricle; confirm these endpoints before assigning the identity. Anatomical reference: [Three-dimensional anatomy of the central core](https://d1xe7tfg0uwul9.cloudfront.net/cbc-portal/wp-content/uploads/2013/07/02022011-JNS1.pdf).
- The cerebral aqueduct connects the third and fourth ventricles, whereas these foramina occupy the lateral-to-third ventricular junction.
- The fourth ventricular apertures communicate with the subarachnoid space, which is not the defining connection here.
- A septal fenestration connects the lateral ventricles across the septum pellucidum and must not be labelled an interventricular foramen of Monro.
- The local relationship to the fornix and thalamus helps distinguish the foramina from an adjacent cavity or lesion; displacement requires checking ventricular continuity rather than relying on position alone.
What robots and AI may and may not do Filled
Must not
- Diagnose hydrocephalus or a brain lesion in a person from images or symptoms.
- Share a person's brain imaging or records without consent.
- Delay advice to seek emergency care when symptoms of raised brain pressure are described.
- Present surgical options as decided for a person.
Only with a human decision
- Any clinical decision about a person's brain imaging.
- Publishing images from a patient's records.
May
- Describe the interventricular foramina and their role in cerebrospinal fluid flow, citing anatomical sources.
- Explain that blockage here can cause raised pressure and needs urgent medical care.
Moral aspects Filled
- Brain conditions are frightening and sensitive, so information must be accurate and careful.
- Delayed care for blocked fluid flow can cause lasting harm.
Who is affected
- Patients
- Families
- Clinicians
Owners Filled
Steward
The person in whose body they lie; clinicians hold the records of findings.
Links to other meta-models Filled
parent
- Q112826975 - registry parent class
- Q28654074 - registry parent class
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.interventricular-foramina
- Wikidata: Q3540833 (https://www.wikidata.org/wiki/Q3540833)
Direct properties required Filled
- Observation laterality: left | right | bilateral | indeterminate
- Anatomical context: species, developmental stage and native or surgically altered anatomy
- Ventricular endpoints: ipsilateral lateral ventricle and third ventricle, with evidence for each connection
- Minimum visible lumen dimensions: mm; specify side, plane, sequence, boundary convention and uncertainty
- Visible lumen area: mm²; specify section orientation and segmentation method
- Patency assessment: supported patent | suspected partial obstruction | supported complete obstruction | indeterminate
- CSF transit evidence: directly demonstrated | indirectly supported | not demonstrated | not assessed; include method
- Local obstructing or displacing entity: linked lesion, membrane, adhesion or other finding; suspected or confirmed relationship
- Foraminal assessability: adequately visualized | partially visualized | not resolved | obscured by artefact
Recognition required Filled
- Paired small openings between each lateral ventricle and the third ventricle.
- Seen on brain imaging or in dissection, not from outside the body.
Capabilities and actions required Filled
- Identify and annotate each foramen in a ventricular image or anatomical specimen.
- Compare left and right lumen geometry using a documented measurement convention.
- Associate suspected obstruction with a local lesion and the observed ventricular enlargement pattern.
- Track foraminal appearance and patency evidence across examinations or interventions.
- Flag uncertain identity, inadequate visualization or conflicting structural and flow evidence for expert review.
Hazards and failure modes required Filled
- Blockage by cysts or tumours causing hydrocephalus.
- Misreading of imaging by non-specialists.
Standards and interfaces required Filled
- Terminologia Anatomica, Federative International Programme for Anatomical Terminology (FIPAT).
Context of use required Filled
- These paired openings are encountered in neuroanatomy, brain imaging and neurosurgical assessment of the ventricular system.
- Their location and openness are assessed when investigating impaired cerebrospinal fluid circulation or enlargement of the lateral ventricles.
Sources Filled
- Wikidata item Q3540833: interventricular foramina - identity and sense of the item
- Wikipedia: Interventricular foramina (neuroanatomy) - general description of the item
Open questions
- Should the registry concept formally cover homologous structures across species, and which anatomical differences require explicit qualification?
- Which age-specific reference measurements are sufficiently validated, and what section orientation and lumen-boundary convention do they require?
- What imaging evidence reliably distinguishes a very narrow patent foramen from complete occlusion when direct flow assessment is inconclusive?
- How should congenital variation, acquired narrowing and postoperative distortion be distinguished when baseline observations are unavailable?
- Which findings justify suspected intermittent obstruction, and how should uncertainty be represented when examinations capture only isolated time points?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q3540833/spec.json