frontal bone
Enable an agent to recognise a frontal bone, record its regional anatomy and observed condition, and determine which comparisons, assessments or interventions require further evidence.
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.
recalled by Codex without web access - no source was read
Researched by: Codex
Purpose and description
Enable an agent to recognise a frontal bone, record its regional anatomy and observed condition, and determine which comparisons, assessments or interventions require further evidence.
The frontal bone is a cranial bone that in adult humans normally forms a single bone comprising the forehead, the roofs of the orbits, and part of the floor of the anterior cranial fossa.
It can be Attribute an observed bone or fragment to the frontal bone using landmarks and articulated context.; Annotate frontal regions, sutural margins and visible sinus boundaries on an image or specimen.; Measure regional thickness, contour, asymmetry and displacement using declared reference points.; Compare observations over time while accounting for development, imaging differences and intervention.; Flag unresolved discontinuities or boundary involvement for qualified review.; Assemble region-specific evidence for an authorised assessment or intervention without deriving treatment from bone shape alone..
Distinguishing features
In the human reference, identify the anterior cranial bone through its squamous, orbital and nasal regions and supraorbital landmarks. [Complete Anatomy](https://www.elsevier.com/resources/anatomy/skeletal-system/axial-skeleton/frontal-bone/20545)
Distinguish it from a parietal bone by its position anterior to the coronal suture. [Complete Anatomy](https://www.elsevier.com/resources/anatomy/skeletal-system/axial-skeleton/frontal-bone/20545)
Distinguish its nasal region from separate nasal bones by tracing the frontonasal articulation. [Complete Anatomy](https://www.elsevier.com/resources/anatomy/skeletal-system/axial-skeleton/frontal-bone/20545)
Do not require a frontal sinus or complete midline fusion for identification: absent sinuses and persistent adult metopic sutures are documented variants. [Complete Anatomy](https://www.elsevier.com/resources/anatomy/skeletal-system/axial-skeleton/frontal-bone/20545)
For a fragment, require a defensible combination of landmarks, margins and specimen context; a curved bone fragment alone is insufficient.
Scope
+ Identification of a whole frontal bone or an attributable fragment
+ Squamous, orbital and nasal regions, their landmarks and anatomical boundaries
+ Bone geometry, thickness and local structural continuity
+ Metopic and bordering sutures in developmental context
+ Frontal sinus presence and its bony boundaries
+ Local injury, disease-related alteration and surgical modification
- Whole-organism taxonomy, habitat and conservation status
- Complete skull geometry and mechanics beyond frontal-bone relationships
- Brain, meninges and orbital contents as independently modelled structures
- Frontal sinus mucosal disease and drainage physiology
- General fracture classifications and patient-level treatment protocols
- Implants and surgical instruments as manufactured objects
Characteristics
- Species and anatomical bearer
- Species reference; individual or specimen reference; unknown permitted Determines which anatomical and developmental comparisons are applicable.
- Representation and completeness
- In situ bone; isolated bone; fragment; image-derived representation; whole or partial coverage Separates the anatomical structure from the evidence available to identify it.
- Regional attribution
- Squamous; orbital; nasal; multiple regions; uncertain; left/right/midline where applicable Locates observations without treating paired regions as separate registered things.
- Local bone thickness
- mm, with landmark, measurement direction, method and uncertainty Makes regional comparisons reproducible and avoids a misleading single thickness for the entire bone.
- Forehead and supraorbital geometry
- Distances in mm; angles in degrees; landmark coordinates in a declared frame Supports explicit comparisons of contour and asymmetry.
- Metopic suture appearance
- Visible; partly fused; fused; indeterminate; not assessable, with age and observation method Prevents a midline feature from being interpreted without developmental context.
- Frontal sinus configuration
- Presence, absence or indeterminate for each side; extent and asymmetry where assessable Distinguishes demonstrated absence from incomplete observation and locates adjacent bony walls.
- Regional structural integrity
- No discontinuity observed; discontinuity; defect; repaired region; indeterminate Records what is visible before assigning a cause or diagnosis.
- Discontinuity displacement
- Gap and step-off in mm; angulation in degrees; affected region and reference surface Describes local disruption in terms that can be compared across observations.
- Reconstruction relationship
- Linked operative record, bone flap, graft or implant; location and date Explains altered boundaries and separates native bone from introduced material.
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 17 findings · 29 questions.
Anatomical identity Establish which frontal bone, region or fragment is represented.
An anatomical part must not inherit the organism-focused assumptions of the batch, and fragment identification needs explicit support.
Bearer and representation
Connect the anatomical structure to its organism and observational representation.
Frontal bone attribution
Record the basis for assigning a specimen or image region to this registry concept.
- Which species and individual or specimen does this frontal bone belong to? provenance
- Is the record about a whole bone, a fragment or an image representation, and what supports its identification? definition
Regional boundaries
Separate frontal-bone regions from neighbouring bones and soft tissues.
Region and margin assignment
Assign visible material to named regions while preserving uncertain margins.
- Which squamous, orbital or nasal regions and which sided landmarks are represented? definition
- Where does the observed frontal bone end and an adjacent bone, missing segment or segmentation uncertainty begin? boundary
Regional bone architecture Describe the forehead contour, supraorbital landmarks and local bone construction.
Frontal-bone shape and thickness need regional measurements tied to recognisable anatomy.
Forehead and orbital contour
Anchor shape observations to frontal and supraorbital landmarks.
Landmark-based geometry
Record contour and asymmetry with an explicit orientation and comparison basis.
- Which frontal eminence, glabellar and supraorbital landmarks can be located reliably? measurement
- What contour or side-to-side differences are measurable, and in which coordinate frame? measurement
Local thickness and surfaces
Describe the bone at specific sites without averaging away structural differences.
Site-specific bone profile
Associate thickness and surface observations with their precise location and imaging limits.
- Where and along which direction was thickness measured, and does the measurement cross a sinus cavity? measurement
- Which external and internal surfaces or intervening bone layers are actually resolved by the observation? boundary
Development and sutures Interpret frontal-bone fusion and sutural appearance in age and species context.
Midline and bordering sutures require developmental interpretation before an agent labels them abnormal.
Metopic state
Record the observed midline separately from its interpretation.
Midline fusion assessment
Document visibility and extent of midline fusion without imposing an unsupported age cutoff.
- What is the observed metopic suture appearance and extent, and how was it assessed? measurement
- Which age- and species-appropriate evidence supports interpreting this appearance as developmental, persistent or potentially abnormal? provenance
Bordering sutures and growth
Relate bordering sutural observations to frontal contour and recorded development.
Sutural context
Keep individual suture observations distinct from a broader cranial growth assessment.
- Which bordering sutures are assessable, and what appearance is recorded at each? measurement
- Does interpretation require linked whole-skull shape, growth history or specialist assessment? action
Sinus and orbital interfaces Locate frontal sinus spaces and the frontal bone's boundaries with orbital and cranial structures.
An alteration's significance depends on which frontal region and adjacent compartment it involves.
Frontal sinus bony envelope
Record sinus configuration and assessable walls without assuming bilateral presence.
Sinus extent and walls
Distinguish cavity configuration, wall condition and limits of observation.
- For each side, is a frontal sinus demonstrated, demonstrably absent or not assessable? measurement
- Where are its anterior and posterior bony boundaries, and is any discontinuity observed? boundary
Orbital and cranial boundaries
Map local bony observations to neighbouring compartments and supraorbital openings.
Interface involvement
Record which anatomical interfaces an alteration reaches while leaving adjacent tissue assessment to linked records.
- Does the observed alteration involve the orbital region, an intracranial-facing surface or a supraorbital notch or foramen? boundary
- Which linked observations are needed to assess adjacent orbital, neural or meningeal structures? action
Integrity and alteration Describe discontinuities, local remodelling and reconstruction with evidence appropriate to the observation.
The model must distinguish visible frontal-bone changes from inferred causes and support reviewable next actions.
Discontinuities and defects
Characterise interrupted bone and competing explanations.
Discontinuity characterisation
Locate and measure a discontinuity before assigning traumatic, developmental or surgical origin.
- Which frontal regions are interrupted, and what gap, step-off, depression or fragmentation can be measured? measurement
- What evidence distinguishes fracture from suture, operative margin, specimen damage or imaging artefact? provenance
- Which unresolved features require qualified review before the observation is used to guide action? action
Remodelling and reconstruction
Track altered bone and introduced material across dated observations.
Alteration history
Describe thickening, loss, healing or operative change without substituting morphology for a confirmed diagnosis.
- Where is bone thickening, loss or remodelling observed, and has it changed on comparable examinations? measurement
- Which records explain a bone flap, graft, implant or resection, and where are native-bone boundaries? provenance
- What additional evidence is needed before attributing the change to a disease or selecting an intervention? 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.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- The description assumes human anatomy; frontal bones also occur in other vertebrates, with differences in form and fusion.
- The listed kinds are fusion variants, not separate formal classes of bone; the squamous, orbital, and nasal portions are anatomical parts.
- Recalled anatomical knowledge only; numerical measurements and database identifiers are omitted because they require verification.
- Which of these check these first hold for the sense of frontal bone this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Adult frontal bone with a fused metopic suture
- Adult frontal bone with a persistent metopic suture
- Which of these kinds and varieties hold for the sense of frontal bone this model covers, and on what evidence? provenance
Identifiers and schemes
Recalled without web access and unsourced; every item is a lead to verify.
- Terminologia Anatomica - Os frontale - Standard Latin anatomical name for the frontal bone.
- Which of these identifiers and schemes hold for the sense of frontal bone this model covers, and on what evidence? provenance
Standards and regulation
Recalled without web access and unsourced; every item is a lead to verify.
- Terminologia Anatomica, maintained by the Federative International Programme for Anatomical Terminology (FIPAT), standardizes human anatomical terminology.
- Which of these standards and regulation hold for the sense of frontal bone this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Anatomical landmark in skull imaging and craniofacial surgery.
- Assessment of forehead, orbital roof, and frontal sinus injuries.
- Cranial measurements in biological anthropology and forensic examination.
- Study of skull development and premature cranial suture fusion.
- Which of these real-world use hold for the sense of frontal bone 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.
- Fractures can involve the frontal sinus, orbital roof, or underlying intracranial structures.
- Posterior frontal sinus wall injury can be associated with cerebrospinal fluid leakage.
- Premature fusion of the metopic suture can produce trigonocephaly.
- Infection involving the frontal sinus can spread into the frontal bone and cause osteomyelitis.
- Which of these failure modes and hazards hold for the sense of frontal bone 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.
- Frontal sinus - An air-filled paranasal cavity within the frontal bone, rather than the enclosing bone itself.
- Frontal lobe - Brain tissue lying behind the forehead, rather than part of the skull.
- Parietal bone - One of the paired bones forming much of the superior and lateral cranial vault; the coronal suture separates it from the frontal bone.
- Forehead - An external body region containing skin and other soft tissues over the frontal bone.
- Metopic suture - The developmental midline junction between the two frontal bone halves, rather than the bone itself.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of frontal bone this model covers, and on what evidence? provenance
What the second pass must settle
- Does vr.tr.frontal-bone denote human anatomy specifically or homologous frontal bones across vertebrates, and which species-specific extensions are required?
- Does an existing Vercy world model already own this anatomical concept, requiring a registry link instead of a separate publication?
- Which authoritative age- and species-specific references should govern interpretation of metopic fusion and frontal sinus development?
- Which landmark conventions and imaging methods provide reproducible frontal thickness, contour and sinus-wall measurements, with what uncertainty?
- What validated criteria and professional review requirements should govern escalation of ambiguous sutures, discontinuities and orbital or cranial interface involvement?