primary motor cortex
E211953
The primary motor cortex is a brain region in the frontal lobe responsible for the voluntary control and precise execution of skeletal muscle movements.
All labels observed (4)
| Label | Occurrences |
|---|---|
| primary motor cortex canonical | 12 |
| precentral gyrus | 4 |
| primary motor area | 1 |
| somatomotor cortex | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1909525 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: primary motor cortex Context triple: [Broca's area, connectedTo, primary motor cortex]
-
A.
prefrontal cortex
The prefrontal cortex is the front part of the brain’s frontal lobes responsible for higher-order functions such as decision-making, attention, impulse control, and working memory.
-
B.
Broca's area
Broca's area is a region in the frontal lobe of the dominant hemisphere of the brain that is crucial for speech production and language processing.
-
C.
Wernicke area
Wernicke area is a region of the human brain’s temporal lobe crucial for understanding spoken and written language.
-
D.
Broca
Broca is a French surname most famously associated with Paul Broca, the 19th-century physician and anatomist who identified the brain region responsible for speech production.
-
E.
RA (robust nucleus of the arcopallium)
RA (robust nucleus of the arcopallium) is a premotor song-control nucleus in the songbird brain that plays a key role in generating and learning vocalizations, particularly studied in species like the zebra finch.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: primary motor cortex Target entity description: The primary motor cortex is a brain region in the frontal lobe responsible for the voluntary control and precise execution of skeletal muscle movements.
-
A.
prefrontal cortex
The prefrontal cortex is the front part of the brain’s frontal lobes responsible for higher-order functions such as decision-making, attention, impulse control, and working memory.
-
B.
Broca's area
Broca's area is a region in the frontal lobe of the dominant hemisphere of the brain that is crucial for speech production and language processing.
-
C.
Wernicke area
Wernicke area is a region of the human brain’s temporal lobe crucial for understanding spoken and written language.
-
D.
Broca
Broca is a French surname most famously associated with Paul Broca, the 19th-century physician and anatomist who identified the brain region responsible for speech production.
-
E.
RA (robust nucleus of the arcopallium)
RA (robust nucleus of the arcopallium) is a premotor song-control nucleus in the songbird brain that plays a key role in generating and learning vocalizations, particularly studied in species like the zebra finch.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
Brodmann area
ⓘ
brain region ⓘ cerebral cortex area ⓘ motor area ⓘ |
| alsoKnownAs |
M1
ⓘ
primary motor area ⓘ somatomotor cortex ⓘ
linked to:
primary motor cortex
|
| bloodSupply |
anterior cerebral artery
ⓘ
middle cerebral artery ⓘ |
| BrodmannAreaNumber | 4 ⓘ |
| contains | Betz cells ⓘ |
| controls |
contralateral face movements
ⓘ
contralateral lower limb movements ⓘ contralateral upper limb movements ⓘ |
| cytoarchitectonicFeature | prominent Betz cells ⓘ |
| developmentalFeature | myelination continues into adolescence ⓘ |
| exhibits |
motor homunculus
ⓘ
somatotopic organization ⓘ |
| hasFunction |
control of contralateral body movements
ⓘ
control of fine motor movements ⓘ control of movement direction ⓘ control of movement force ⓘ control of movement speed ⓘ control of movement timing ⓘ execution of voluntary movements ⓘ generation of motor commands ⓘ somatotopic representation of body muscles ⓘ voluntary control of skeletal muscle movements ⓘ |
| hemisphericOrganization | bilateral (left and right hemispheres) ⓘ |
| layerWithBetzCells | cortical layer V ⓘ |
| lesionConsequence |
contralateral paralysis
ⓘ
contralateral weakness ⓘ loss of fine motor control ⓘ spastic paresis ⓘ |
| locatedAnteriorTo | central sulcus ⓘ |
| locatedIn |
frontal lobe
ⓘ
precentral gyrus ⓘ
linked to:
primary motor cortex
|
| partOf |
cerebral cortex
ⓘ
frontal lobe motor system ⓘ motor cortex ⓘ neocortex ⓘ
linked to:
cerebral cortex
|
| projectsTo |
brainstem motor nuclei
ⓘ
corticobulbar tract ⓘ corticospinal tract ⓘ spinal cord anterior horn ⓘ |
| receivesInputFrom |
basal ganglia
ⓘ
cerebellum ⓘ premotor cortex ⓘ somatosensory cortex ⓘ supplementary motor area ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: primary motor cortex Description of subject: The primary motor cortex is a brain region in the frontal lobe responsible for the voluntary control and precise execution of skeletal muscle movements.
Referenced by (18)
Full triples — surface form annotated when it differs from this entity's canonical label.