primary motor cortex

E211953

Brodmann area brain region cerebral cortex area motor area

The primary motor cortex is a brain region in the frontal lobe responsible for the voluntary control and precise execution of skeletal muscle movements.

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All labels observed (3)

Label	Occurrences
primary motor cortex canonical	6
precentral gyrus	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 ⓘ primary motor cortex ⓘ surface form: somatomotor 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 ⓘ primary motor cortex self-linksurface differs ⓘ surface form: precentral gyrus
partOf	cerebral cortex ⓘ frontal lobe motor system ⓘ motor cortex ⓘ cerebral cortex ⓘ surface form: neocortex
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

Referenced by (8)

Full triples — surface form annotated when it differs from this entity's canonical label.

Broca's area → connectedTo → primary motor cortex ⓘ

primary motor cortex → alsoKnownAs → primary motor cortex ⓘ

this entity surface form: somatomotor cortex

primary motor cortex → locatedIn → primary motor cortex self-linksurface differs ⓘ

this entity surface form: precentral gyrus

middle cerebral artery → supplies → primary motor cortex ⓘ

cerebral cortex → hasPart → primary motor cortex ⓘ

premotor cortex → borderedPosteriorlyBy → primary motor cortex ⓘ

premotor cortex → projectsTo → primary motor cortex ⓘ

premotor cortex → distinguishedFrom → primary motor cortex ⓘ

All labels observed (3)

How this entity was disambiguated Show

Statements (50)

How these facts were elicited Show

Referenced by (8)

How this entity was disambiguated

How these facts were elicited