chorda tympani
Enable an agent to recognise the chorda tympani, record its anatomical continuity and functional evidence, and identify when assessment or procedural protection requires specialist judgment.
Bundle → Layer → Finding → Questions Filled
6 bundles · 11 layers · 16 findings · 27 questions
Identity and branch boundaries Establish which chorda tympani instance is represented and where its anatomical ownership ends.
Instance identification
Anchor the branch to an organism and side.
Side-specific nerve instance
Require an explicit distinction between the anatomical concept and an observed left or right branch.
- Does this record describe the anatomical concept or a particular nerve in an organism or specimen? definition
- Which species, specimen and side does the observation concern? provenance
Branch and fiber ownership
Separate the discrete branch from connected nerves and continuing fiber populations.
Lingual junction boundary
Represent the lingual-nerve junction as a connection, with continuing chorda-derived fibers distinguished from the whole lingual nerve.
- Does the observation concern the separate chorda tympani or its fibers after joining the lingual nerve? boundary
- What anatomical evidence supports assigning this structure or fiber population to the chorda tympani? provenance
Course and middle-ear relations Record the branch's route and its locally observed anatomical relationships.
Route continuity
Trace the route using named connections and landmarks.
Facial-to-lingual route
Record evidence for the facial-nerve origin, tympanic course, petrotympanic exit and lingual-nerve junction.
- Which portions of the route have actually been visualised or otherwise demonstrated? provenance
- Where are the origin, exit and junction located in this instance? measurement
Local landmarks and variation
Capture relationships needed to interpret a specific anatomical field.
Tympanic landmark relations
Record relationships to the tympanic membrane, malleus and incus without assuming identical geometry across individuals.
- How does the observed nerve relate to the tympanic membrane and adjacent ossicles? measurement
- Does an unusual course reflect a documented variant, displacement, or uncertain identification? boundary
Taste and secretomotor connections Represent the two principal functional components separately.
Gustatory component
Associate taste observations with a precisely identified tongue region.
Regional taste territory
Record the sampled side and tongue region rather than treating every taste complaint as evidence about this branch.
- Which tongue region and side are represented by the taste observation? boundary
- Was taste assessed separately from touch, pain and temperature sensation? measurement
Parasympathetic component
Link the branch to the ganglionic relay and gland targets.
Ganglion and gland boundary
Keep the preganglionic chorda component distinct from the ganglion, postganglionic pathways and gland tissue.
- Does the record concern the chorda component, the submandibular ganglion, or a downstream gland pathway? boundary
- What evidence connects the observed secretory change specifically to this pathway? provenance
Integrity and functional evidence Describe structural condition and functional observations with their limits.
Structural condition
Record the location and evidential basis of suspected or observed disruption.
Segment-specific integrity
Attach continuity or injury assessments to an identified segment, method and date.
- Which segment is intact, disrupted or indeterminate, and how was that assessed? measurement
- Is injury directly documented or inferred from symptoms and procedural history? provenance
Functional observations
Keep regional taste tests, salivary measurements and subjective reports distinguishable.
Test context and attribution
Record methods and competing explanations before attributing a deficit to this branch.
- What protocol, stimulus, collection site and timing produced the functional result? measurement
- Which alternative explanations or unassessed pathways limit attribution to the chorda tympani? boundary
- Are baseline or contralateral observations available under comparable conditions? provenance
Procedural exposure and follow-up Connect documented handling of the branch to subsequent observations.
Operative relationship
Record identification and handling within the actual operative field.
Documented nerve handling
Distinguish confirmed identification, recorded manipulation and observed injury from missing documentation.
- Was the chorda tympani identified, and what handling or injury was recorded? provenance
- Does unresolved anatomy or documented exposure require review by the responsible specialist? action
Post-exposure course
Track observations over time without assuming a universal recovery trajectory.
Serial taste and secretion record
Compare dated symptoms and measurements with baseline while preserving uncertainty about causation and recovery.
- How have regional taste findings, salivary observations and reported symptoms changed since exposure? measurement
- What further assessment has the responsible clinician specified for unresolved findings? 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 chorda tympani 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 chorda tympani 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 chorda tympani 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 chorda tympani 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 chorda tympani 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 chorda tympani 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.LIV
- Other names and narrower kinds
- right chorda tympani, left chorda tympani
What it is Filled
The chorda tympani is a branch of the facial nerve that traverses the middle ear and joins the lingual nerve, carrying taste afferents from the anterior two-thirds of the tongue and preganglionic parasympathetic fibres to the submandibular ganglion for secretion by the submandibular and sublingual salivary glands.
In scope
- Laterality, organism and anatomical-instance identity
- Course from the facial nerve through the middle ear to the lingual nerve
- Taste-afferent and preganglionic parasympathetic components
- Relationships to the tongue and submandibular ganglion
- Observed integrity, functional assessment and procedural exposure
Out of scope
- The complete facial nerve and its other branches
- The lingual nerve's general somatic sensory component
- Whole-tongue anatomy and the complete central taste pathway
- Salivary gland structure and independent gland disease
- Whole-organism taxonomy, habitat and conservation status
- Diagnosis and treatment protocols for ear disease or taste disorders
Why it exists Filled
Enable an agent to recognise the chorda tympani, record its anatomical continuity and functional evidence, and identify when assessment or procedural protection requires specialist judgment.
Distinguishing features Filled
- Identify a branch of the facial nerve carrying taste and parasympathetic fibers, rather than identifying it as an organism or a facial-expression motor branch. [NCBI MeSH](https://www.ncbi.nlm.nih.gov/sites/entrez?Cmd=DetailsSearch&Db=mesh&Term=%22Chorda+Tympani+Nerve%22%5BMeSH+Terms%5D)
- Trace the characteristic middle-ear course and exit toward the lingual nerve; proximity to the tympanic membrane alone is insufficient identification. [Anatomy of the chorda tympani](https://www.ncbi.nlm.nih.gov/books/NBK546586/?report=printable)
- Distinguish taste from the anterior two-thirds of the tongue from general sensation carried by the lingual nerve. [Anatomy of the lingual nerve](https://www.ncbi.nlm.nih.gov/books/NBK546652/?report=reader)
- Identify the parasympathetic connection through the submandibular ganglion toward the submandibular and sublingual glands. [Anatomy of the lingual nerve](https://www.ncbi.nlm.nih.gov/books/NBK546652/?report=reader)
What robots and AI may and may not do Filled
Must not
- Diagnose nerve damage from reported changes in taste.
- Tell a patient whether their nerve was injured during ear surgery.
- Disclose a person's medical records without consent.
- Promote unproven remedies for taste loss.
Only with a human decision
- Surgical decisions on the middle ear that risk the nerve.
May
- Explain the course and functions of the chorda tympani in general terms.
- Suggest that a person with a new loss of taste or facial weakness see a doctor.
Moral aspects Filled
- Taste loss lowers quality of life and appetite, especially in older people.
- Patients deserve honest information about surgical risks to the nerve.
Who is affected
- Patients undergoing ear surgery
- People with facial nerve palsy
- Older people with poor appetite
Owners Filled
Steward
Nobody owns it; it is part of each person's body.
Links to other meta-models Filled
parent
- Q66543496 - registry parent class
- Q9620 - registry parent class
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.chorda-tympani
- Wikidata: Q1076379 (https://www.wikidata.org/wiki/Q1076379)
Direct properties required Filled
- Anatomical instance: Organism or specimen identifier, species, and left or right side
- Observed course: Mapped segments and landmarks, each marked observed, inferred or unassessed
- Fiber component: Taste afferent; preganglionic parasympathetic; unresolved
- Structural continuity: Apparently continuous; partially disrupted; transected; indeterminate; unassessed
- Regional taste assessment: Protocol-specific score or threshold, with stimulus, units, tongue site, side and date
- Salivary assessment: Flow in mL/min where measured, with collection source and stimulation conditions
- Procedural exposure: Unassessed; identified without documented manipulation; manipulated; documented injury
Recognition required Filled
- A thin nerve crossing the middle ear just behind the eardrum, visible to surgeons during ear operations.
Capabilities and actions required Filled
- Identify and annotate a side-specific chorda tympani in anatomical or operative records.
- Trace connections while preserving the distinction between the named branch and its fibers traveling with the lingual nerve.
- Compare regional taste observations across sides and dates under a recorded protocol.
- Flag documented proximity or exposure during middle-ear procedures for specialist review.
- Link structural observations, symptoms and functional measurements without asserting an unsupported causal diagnosis.
Hazards and failure modes required Filled
- Can be stretched or cut during middle ear surgery, altering taste.
- Damage can cause a metallic taste or dry mouth on one side.
Standards and interfaces required Filled
- Terminologia Anatomica, issued by the Federative International Programme for Anatomical Terminology under the International Federation of Associations of Anatomists, provides standardized anatomical nomenclature for the chorda tympani.
Context of use required Filled
- The chorda tympani is encountered in anatomical study of the facial nerve, middle ear and oral sensory pathways.
- Its course is relevant to specialist assessment of taste disturbances and to planning procedures involving nearby ear structures.
- Its parasympathetic connections are considered when studying secretion by the submandibular and sublingual salivary glands.
Sources Filled
- Wikidata item Q1076379: chorda tympani - identity and sense of the item
- Wikipedia: Chorda tympani - general description of the item
Open questions
- Should the registry concept support nonhuman species directly, and which species-specific anatomical differences require separate profiles?
- Which course variants and landmark measurements have sufficiently strong evidence to support recognition in different operative settings?
- Which regional taste protocols and reference values support reliable side-specific assessment across ages and testing conditions?
- How specifically can available salivary measurements distinguish chorda tympani dysfunction from gland disease or other influences?
- What evidence supports prognosis after different documented injuries, and how should symptomatic improvement be distinguished from restored nerve function?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q1076379/spec.json