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Anatomy · Anatomical structures

Broca's area

area Broca

Broca's area (area Broca) is the motor speech center that provides its expressive component. It is located in the posterior parts of the inferior frontal gyrus of the dominant cerebral hemisphere. This structure is responsible for planning articulation and generating the detailed motor program for pronouncing words or writing.

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LocalizationInferior frontal gyrus (Brodmann areas 44, 45)
FunctionMotor organization of speech (expressive component)
PathologyMotor aphasia (Broca's aphasia)
Blood supplyMiddle cerebral artery territory
3 min readFor medical studentsUpdated 09/24/2026
Material prepared by WhiteCoat Pro editorial team based on platform study guidesReviewed by medical editor: Aulov A. A., general practitioner · 09/24/2026

Where is Broca's area located?

Broca's area is spatially separated from the primary motor areas. It was described by P. Broca in 1861.

  • Hemisphere: Localized in the dominant hemisphere. In the vast majority of people (about 95%), this is the left hemisphere, which typically corresponds to contralateral right-handedness.
  • Lobe and gyrus: Occupies the basal part of the frontal lobe (lobus frontalis), specifically the posterior parts of the inferior frontal gyrus.
  • Cytoarchitectonics: Corresponds to Brodmann areas 44 and 45.
  • Topography: Located superior to the lateral (Sylvian) sulcus and anterior to the region of the precentral gyrus that controls the muscles of the larynx, pharynx, tongue, and lips.

Functions and mechanism of action

Broca's area provides the expressive component of speech—the ability to produce one's own coherent, logically structured speech. The center is activated both during speech aloud and during inner speech (silent articulation of words).

The process of speech realization goes through the following stages:

  1. Information reception: The semantic meaning of an utterance is formed in Wernicke's sensory center. From there, the impulse is transmitted to Broca's area via an association pathway, the arcuate fasciculus (fasciculus arcuatus).
  2. Programming: A detailed vocalization program (motor speech scheme) is formed in Broca's area.
  3. Command transmission: Impulses are sent to the facial areas of the motor cortex (precentral gyrus) of the right and left hemispheres. Detailed programs are created there for the motor centers of the brainstem cranial nerves that innervate the speech musculature.

During written speech production, impulses from Broca's center travel not to the facial areas, but to the motor representations of the right or left hand in the cerebral cortex.

Note: During the generation of "non-automatic speech," Broca's area is activated immediately after the primary cortical areas (in contrast to "automatic speech," which involves the insular cortex).

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Blood supply

Broca's area is located in the central part of the middle cerebral artery basin. Direct blood supply to this region comes from the precentral sulcus artery.

Clinical significance: Broca's aphasia

Damage to the posterior parts of the inferior frontal gyrus leads to efferent motor aphasia (Broca's aphasia).

  • Symptomatology: Articulation control is impaired. Speech becomes slow, hesitant, halting, and indistinct. Characteristic features include a "telegraphic style" of communication, agrammatism (distortion of sentence structures), and marked difficulty in word finding. In severe cases, the patient is capable of producing only isolated sounds.
  • Associated impairments: In a clinical case, a small ischemic lesion in the region of the anterior central (precentral) gyrus caused right-sided hemiparesis.
  • MRI findings: In cerebral infarction, the lesion appears as an area of hyperintense (bright) signal on diffusion-weighted imaging (DWI) and T2-weighted images, including FLAIR sequences.

Class and exam questions

How does motor aphasia differ from dysarthria?

Speech is impaired in aphasia. Articulation and phonation are impaired in dysarthria or anarthria, but not speech production per se: grammar, morphology, and syntax are preserved.

How do Broca's and Wernicke's areas interact?

Wernicke's center is responsible for speech comprehension and the creation of the semantic structure of an utterance. This information is transmitted via the arcuate fasciculus to Broca's center, which forms a detailed motor program for word pronunciation.

What happens to Broca's area during writing?

During written speech, Broca's area also forms the motor scheme, but directs impulses not to the facial areas of the motor cortex, but to the motor representations of the right or left hand.

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What else to study on this topic

  • Wernicke's area (sensory speech center)
  • Arcuate fasciculus
  • Precentral gyrus (motor cortex)
  • Middle cerebral artery

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Other topics in the "Anatomical Structures" section

Precentral gyrusWernicke's area
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