internal occipital protuberance
Enable an agent to recognise, describe and assess the internal occipital protuberance as an endocranial bony landmark while distinguishing observed anatomy from inferred relationships.
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
Bundle → Layer → Finding → Questions Filled
6 bundles · 11 layers · 16 findings · 26 questions
Endocranial identity Establish which occipital feature the registry entry denotes.
Bone and surface
Locate the candidate on the correct anatomical substrate.
Internal squamous location
Record the evidence that the candidate is a prominence on the endocranial occipital squama.
- What visible features establish that this is the internal surface of the occipital squama? definition
- Which specimen or imaging series supports this identification? provenance
Neighbouring landmark boundaries
Separate the local prominence from larger or adjacent features.
Protuberance extent
Define the local feature without absorbing the entire cruciform eminence, descending crest or nearby grooves.
- Where does the protuberance merge into the internal occipital crest and surrounding eminence? boundary
- What evidence excludes the external occipital protuberance or a sinus groove as the labelled feature? definition
Prominence geometry Describe the landmark's local shape and position reproducibly.
Contour and size
Characterise the elevation relative to the surrounding internal bone surface.
Defined prominence measurements
Record dimensions only with an explicit local baseline and extent convention.
- Which surrounding surface defines the baseline for prominence height? measurement
- What height, width and extent are measurable, and with what uncertainty? measurement
Position and alignment
Locate the prominence relative to independently defined cranial references.
Crest alignment variation
Do not require exact alignment with the internal occipital crest; misalignment has been reported in a [case report](https://pmc.ncbi.nlm.nih.gov/articles/PMC5014936/).
- How are the protuberance reference point and cranial midsagittal plane defined? measurement
- Does the observed internal occipital crest meet the prominence centrally, or is there a measurable offset? measurement
Dural and venous relations Represent adjacent soft-tissue anatomy without identifying it with the bone.
Sinus topography
Distinguish venous grooves from the actual venous channels and their junctions.
Confluence localisation
Record the confluence as a separate structure whose relationship requires evidence; a [technical anatomical report](https://pmc.ncbi.nlm.nih.gov/articles/PMC4968780/) describes the prominence inferior to the confluence.
- Which adjacent sinus grooves are visible, and where do they lie relative to the prominence? measurement
- Is the confluence itself demonstrated by soft-tissue observation or imaging, or only inferred from bone? provenance
Dural attachment boundaries
Separate attachments attributed to the prominence from those of adjoining crests and margins.
Attachment attribution
Require anatomical evidence for the location and extent of any recorded dural attachment.
- Which dural attachment is directly observed at the prominence, and which evidence supports its identification? provenance
- Does the attachment occupy the protuberance itself or an adjoining ridge or groove margin? boundary
Visibility and preservation Determine whether the observed contour faithfully represents the anatomical landmark.
Observation resolution
Establish whether the prominence can be resolved by the available observation.
Landmark visibility
Separate confident identification from inadequate coverage or resolution.
- Is the internal occipital region adequately exposed or included in the image field? provenance
- Could slice thickness, partial-volume effects or surface smoothing alter the apparent prominence? measurement
Local bone integrity
Assess changes that compromise the landmark's original contour.
Altered contour
Describe visible disruption or alteration without assigning an unsupported cause.
- Is the local contour intact, or affected by fracture, erosion, preparation damage or prior intervention? boundary
- What evidence distinguishes anatomical morphology from acquired or postmortem alteration? provenance
Landmark use Define supported uses of the identified prominence in annotation and anatomical comparison.
Annotation and comparison
Make landmark labels and cross-specimen comparisons traceable.
Reproducible landmark selection
Specify whether an annotation denotes the apex, a selected centre or the whole prominence.
- Which point or region should an agent annotate for the intended comparison? action
- Do compared observations use compatible landmark definitions and measurement methods? measurement
Limits of localisation
Constrain conclusions drawn from this bony landmark.
Independent anatomical confirmation
Use the prominence for orientation while requiring separate evidence for nearby soft-tissue positions.
- What independent evidence is required before using this landmark to localise the venous confluence or a dural attachment? action
- Which ambiguity or alteration makes this instance unsuitable for the proposed localisation task? action
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 internal occipital protuberance 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 internal occipital protuberance this model covers, and on what evidence? provenance
Standards and regulation
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these standards and regulation hold for the sense of internal occipital protuberance 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 internal occipital protuberance 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 internal occipital protuberance 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 internal occipital protuberance 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 internal occipital protuberance is a bony prominence on the intracranial surface of the squamous part of the occipital bone, situated at the intersection of the limbs of its cruciform eminence.
In scope
- Identification of the prominence on the internal surface of the occipital squama
- Boundary between the protuberance and adjoining crests, eminences and grooves
- Specimen-specific position, dimensions and surface morphology
- Relationships to adjacent dural attachments and venous sinus structures
- Visibility, preservation and suitability as an anatomical landmark
Out of scope
- The occipital bone as a whole
- The external occipital protuberance and external craniometric landmarks
- The complete internal occipital crest and cruciform eminence
- Dural folds and venous sinuses as independently modelled structures
- Diagnosis of cranial disease and operative treatment protocols
Why it exists Filled
Enable an agent to recognise, describe and assess the internal occipital protuberance as an endocranial bony landmark while distinguishing observed anatomy from inferred relationships.
Distinguishing features Filled
- Identify it on the cranial cavity-facing surface of the occipital squama; an outward-facing occipital prominence belongs to the external occipital protuberance.
- Identify a local prominence rather than treating the entire descending internal occipital crest as the protuberance.
- Distinguish the bony elevation from adjacent venous grooves and from the soft-tissue confluence of sinuses.
- Use the surrounding cruciform arrangement to support identification, while recording departures from the expected alignment.
What robots and AI may and may not do Filled
Must not
- Interpret skull imaging as a diagnosis without clinical review.
- Handle human skeletal remains without respect for the dead and lawful authority.
- Share identifiable imaging or remains photographs without consent or legal basis.
Only with a human decision
- Any decision about neurosurgical approach near this landmark.
May
- Describe the internal occipital protuberance and its relation to the venous sinuses.
- Support authorized clinicians in labelling it on skull imaging.
Moral aspects Filled
- Human remains deserve dignity, including those used in teaching.
- Venous sinuses near this landmark bleed heavily if injured.
Who is affected
- Patients
- Families of the dead
- Students
Owners Filled
Steward
Nobody: part of a person's skull; clinicians and anatomy departments answer for its study.
Links to other meta-models Filled
parent
- Q66579001 - registry parent class
What else AI and robots need to interact with it Incomplete
Identity and identifiers required Filled
- Vercy registry: vr.tr.internal-occipital-protuberance
- Wikidata: Q833576 (https://www.wikidata.org/wiki/Q833576)
Direct properties required Filled
- Parent anatomical structure: Internal surface of the squamous part of the identified occipital bone
- Identification status: Identified; probable; indeterminate; not visualised
- Position relative to reference midline: Signed distance in mm, with reference plane and landmark-point definition
- Local prominence dimensions: Height, width and extent in mm, with boundary and baseline definitions
- Relationship to internal occipital crest: Observed continuity, alignment and offset; indeterminate
- Relationship to venous confluence: Directly observed or independently imaged spatial relationship; inferred; unknown
- Local surface condition: Intact; damaged; remodelled; surgically altered; indeterminate
- Observation method: Dry-bone inspection; dissection; CT; derived surface reconstruction; other documented method
Recognition required Filled
- A raised point on the inside of the back of the skull where four ridges meet in a cross.
Capabilities and actions required Filled
- Annotate the protuberance on a skull specimen or suitable image with identification confidence.
- Measure its prominence and position using explicitly defined anatomical references.
- Compare its alignment with the internal occipital crest and neighbouring sinus grooves.
- Link the bony landmark to separately observed dural and venous anatomy.
- Flag damage, ambiguity or incomplete imaging that prevents reliable landmark use.
Hazards and failure modes required Filled
- Fractures here can injure underlying venous sinuses.
Standards and interfaces required Filled
- Terminologia Anatomica, Federative International Programme for Anatomical Terminology.
Context of use required Missing, in the backlog
Not described yet. This gap is in the card backlog.
Sources Filled
- Wikidata item Q833576: internal occipital protuberance - identity and sense of the item
- Wikipedia: Internal occipital protuberance - general description of the item
Open questions
- Does the registry intend exclusively human anatomy, or should comparative vertebrate occurrences be represented within this entry?
- Which anatomical or morphometric convention best defines the prominence's boundary and reference point?
- What population evidence establishes the distribution of prominence dimensions and offsets relative to the midsagittal plane and internal occipital crest?
- How consistently do adjacent bony grooves predict the actual position and configuration of the venous confluence?
- Which age-related changes and observation thresholds distinguish a weakly expressed prominence from one that is simply not resolvable?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q833576/spec.json