inferior colliculi
Enable an agent to identify the inferior colliculi, record their anatomical and auditory functional state, and assess whether observations support further investigation.
Bundle → Layer → Finding → Questions Filled
6 bundles · 11 layers · 15 findings · 25 questions
Tectal identity Establishes which paired midbrain structures and biological instance the record concerns.
Paired anatomical reference
Anchors the registered kind to a subject or specimen and a laterality convention.
Pair and side assignment
Record whether evidence describes the pair, one side, or a pooled bilateral observation.
- Does this observation concern the left inferior colliculus, the right, or both? boundary
- Which species, subject or specimen, and developmental stage does it describe? provenance
Tectal boundaries
Separates inferior collicular tissue from neighboring tectal structures and fiber pathways.
Landmark-supported identification
Use a named anatomical reference and visible landmarks to justify the outer boundary.
- Which landmarks distinguish this region from the superior colliculus and surrounding midbrain tissue? definition
- Where does the segmentation exclude the brachium, lateral lemniscus, and neighboring periaqueductal tissue? boundary
Collicular subdivisions Represents internal parcellation and the evidence supporting regional assignments.
Atlas parcellation
Preserves subdivision names and boundaries under the reference actually used.
Subdivision nomenclature
Record atlas-specific terminology without assuming external cortex and lateral cortex are universally interchangeable. Rat and cat work explicitly addresses these mapping differences. [Cytoarchitecture study](https://pubmed.ncbi.nlm.nih.gov/18313229/)
- Which atlas and species define the central nucleus and surrounding subdivisions in this record? provenance
- Do alternative subdivision names denote identical tissue boundaries in these references? boundary
Regional morphometry
Captures side-specific size and shape at a resolution justified by the method.
Measured collicular extent
Retain whole-structure and subdivision measurements separately, including segmentation uncertainty.
- What volume and dimensions were measured for each side, and which boundaries were used? measurement
- Can the acquisition resolve subdivisions, or only the external collicular boundary? boundary
Auditory pathway interfaces Records pathways entering, leaving, and linking the inferior colliculi.
Ascending and thalamic connections
Describes interfaces with auditory brainstem sources and thalamic targets.
Directed pathway assignment
Record connection endpoints rather than attributing every auditory pathway to the whole colliculus. Rat tracing demonstrates subdivision-dependent sources of input. [Projection study](https://pubmed.ncbi.nlm.nih.gov/3624552/)
- Which brainstem source or medial geniculate target is linked to which side and subdivision? boundary
- What evidence establishes the connection and its direction? provenance
Descending and commissural connections
Distinguishes cortical inputs and connections involving the opposite inferior colliculus.
Feedback and cross-side evidence
Preserve the origin, target, and laterality of each reported pathway. Cat tracing identifies subdivision-specific cortical projections, which require species-qualified interpretation. [Cortical projection study](https://pubmed.ncbi.nlm.nih.gov/9766397/)
- Is the reported connection cortical-to-collicular, intercollicular, or another directed pathway? definition
- Was laterality demonstrated directly, and in which species and experimental preparation? provenance
Localized auditory function Organizes stimulus-linked responses attributable to identified collicular tissue.
Spectral and temporal responses
Records frequency selectivity and response timing without assuming every observation resolves individual neurons.
Stimulus-conditioned response
Bind measured responses to stimulus parameters, anatomical location, and recording modality.
- Which frequencies, sound levels, durations, and repetition rates produced the measured response? measurement
- Does the evidence measure single-unit activity, population activity, or an indirect imaging signal? provenance
Ear-specific response comparison
Captures responses to separately controlled stimulation of the two ears.
Binaural test conditions
Record ear-specific timing and level manipulations before interpreting a response as sensitivity to spatial hearing cues.
- How did the response change with monaural versus binaural presentation? measurement
- Which interaural time differences in µs or level differences in dB were tested? measurement
Collicular integrity and action Connects localized structural or functional changes to justified next steps.
Localized abnormality
Documents observed tissue changes and their anatomical extent.
Abnormality localization
Separate direct observations of collicular tissue from functional deficits attributed to it.
- Which side and subdivisions show an abnormality, and does it extend into adjacent tissue or pathways? boundary
- What imaging, histological, or physiological evidence supports the observation and any change over time? provenance
Interpretation and targeting
Determines whether available evidence supports annotation, comparison, further investigation, or review of a proposed target.
Evidence-bounded next step
Make localization uncertainty and the responsible clinical or experimental protocol explicit before acting on collicular tissue.
- What additional observation would distinguish inferior-colliculus involvement from upstream or downstream auditory dysfunction? action
- For proposed sampling or stimulation, are the target side, subdivision, localization uncertainty, and governing protocol established? 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 inferior colliculi 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 inferior colliculi 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 inferior colliculi 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 inferior colliculi 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 inferior colliculi 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
- Other names and narrower kinds
- right inferior colliculus, left inferior colliculus
What it is Filled
The inferior colliculi are paired nuclei of the dorsal midbrain that form the lower part of the tectum and integrate ascending auditory information, relaying it chiefly to the medial geniculate bodies of the thalamus.
In scope
- The paired inferior colliculi and side-specific observations
- Anatomical boundaries, dimensions, and relationships to adjacent midbrain structures
- Internal subdivisions and their species-specific atlas assignments
- Ascending, descending, and intercollicular connections at their interfaces with these structures
- Localized auditory responses, tissue abnormalities, and changes over time
Out of scope
- The superior colliculi and their internal organization
- The whole midbrain or complete auditory system
- The cochlea, cochlear nuclei, and superior olivary complex as independent structures
- The medial geniculate bodies and auditory cortex as independent structures
- Hearing disorders as diagnoses and patient-level treatment decisions
- Imaging scanners, recording electrodes, and stimulation devices as equipment
Why it exists Filled
Enable an agent to identify the inferior colliculi, record their anatomical and auditory functional state, and assess whether observations support further investigation.
Distinguishing features Filled
- An anatomical candidate must occupy the caudal tectal position below the superior colliculus in a species-appropriate reference, rather than merely show sound-evoked activity. [Anatomical reference](https://www.ncbi.nlm.nih.gov/books/NBK554468/)
- The plural entry represents the left and right inferior colliculi; a unilateral specimen or region of interest is a side-specific observation within that scope.
- The structure contains neural tissue organized into collicular subdivisions; the adjacent lateral lemniscus and brachium must not be mistaken for the entire structure.
- Its midbrain location distinguishes it from the medial geniculate body in the thalamus, even though both participate in auditory processing.
- A central-nucleus label identifies a constituent region, not the whole inferior colliculus; subdivision terminology must be checked against the selected atlas.
What robots and AI may and may not do Filled
Must not
- Diagnose hearing or brain disorders involving the inferior colliculi in a particular person.
- Interpret an individual's brain scan as a clinical finding.
- Present identifiable patient imaging or case details without consent.
Only with a human decision
- Any clinical decision about a lesion or condition affecting the midbrain.
May
- Describe the inferior colliculi and their role in hearing from reliable sources.
- Label them on anatomical diagrams, brain atlases and educational images.
Moral aspects Filled
- Misreading brain imaging can lead to wrong diagnoses and treatment.
- Animal research on the auditory midbrain raises welfare questions that need ethical review.
Who is affected
- Patients with hearing or brain disorders
- Clinicians
- Research animals
Owners Filled
Steward
Nobody owns them; they are part of each person's body, and the treating clinician answers for their care.
Links to other meta-models Filled
parent
- Q112826975 - registry parent class
- Q66558703 - registry parent class
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.inferior-colliculi
- Wikidata: Q358512 (https://www.wikidata.org/wiki/Q358512)
Direct properties required Filled
- Biological context: Species, subject or specimen identifier, developmental stage
- Observation laterality: Left; right; bilateral separately measured; bilateral pooled; unresolved
- Subdivision assignment: Central nucleus; dorsal cortex; external or lateral cortex under a named atlas; other atlas-defined region; unresolved
- Anatomical extent: Volume in mm³ and dimensions in mm, with side, boundary method, and uncertainty
- Spatial localization: Coordinates in mm in a named reference space, with orientation and localization uncertainty
- Connection evidence: Source region, target region, direction, laterality, method, and evidence reference
- Frequency response: Stimulus frequency in Hz; best frequency in Hz when established; sound level in dB with reference specified
- Response timing: Latency and temporal response measures in ms, with recording modality and stimulus timing
- Observed tissue state: No abnormality detected by stated method; abnormality observed; indeterminate; not assessed
Recognition required Filled
- Two rounded swellings on the back of the midbrain, below the larger superior colliculi.
- Together with the superior colliculi they form four bumps on the dorsal midbrain.
Capabilities and actions required Filled
- Locate and annotate each inferior colliculus in an image or specimen using an identified anatomical reference.
- Assign a localized observation to a side and subdivision, preserving uncertain boundaries.
- Compare left and right measurements under matched acquisition and segmentation conditions.
- Relate auditory responses to stimulus frequency, timing, and ear-specific presentation.
- Map a localized abnormality against collicular subdivisions and documented pathway interfaces.
- Flag when localization, evidence quality, or protocol information is insufficient for a proposed interpretation or intervention.
Hazards and failure modes required Filled
- Lesions from stroke, tumour or injury can disturb hearing and sound localization.
- Their small size makes findings on imaging easy to misread.
Standards and interfaces required Filled
- Terminologia Anatomica, issued by the Federative International Programme for Anatomical Terminology, provides standardized anatomical nomenclature for the inferior colliculus.
Context of use required Filled
- The inferior colliculi are encountered in neuroanatomy, brain imaging and research on auditory processing.
- They integrate ascending auditory signals and relay information toward the thalamus.
- Their location and connections help clinicians and researchers interpret observations involving midbrain auditory pathways.
Sources Filled
- Wikidata item Q358512: inferior colliculi - identity and sense of the item
- Wikipedia: Inferior colliculus - general description of the item
Open questions
- Does the registry intend a human anatomical default, or a cross-species concept requiring explicit homology mappings?
- Which anatomical atlas should govern subdivision boundaries, especially mappings between external and lateral cortex terminology?
- Which species-, age-, and method-specific reference datasets support meaningful judgments about size or left-right asymmetry?
- Which available measurement methods can reliably separate subdivisions and localize functional responses in the intended use setting?
- What evidence threshold should support attributing an auditory deficit specifically to unilateral or bilateral inferior-colliculus dysfunction?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q358512/spec.json