QS Study

Broca’s area

The area, which is concerned with speech, is named Broca’s area on the cerebral cortex. This area also called Brodmann area 44, is an area of the lateral frontal lobe in the dominant hemisphere concerned with the production of speech.

Brodmann’s area number: Area 44 & 45. It is anterior to the primary motor cortex on the precentral gyrus.

Location: In the inferior frontal gyrus. It lies specifically in the third frontal convolution, just anterior to the face area of the motor cortex and just above the Sylvian fissure. It is bounded anteriorly by the ascending ramus of the lateral (Sylvian) fissure and posteriorly by the precentral sulcus.

Area 44 (Pars triangularis): Between the anterior and ascending rami of lateral fissure.

Area 45 (pars opercularis): Between the ascending and posterior rami of lateral fissure.

Function: Control the motor functions of speech. This area is a brain center associated with the motor control of speech and usually located in the left side of the frontal lobe

Effects of lesion: Motor aphasia.

Broca's Area 1

Fig: Broca’s Area

Blood supply –

  • Arterial supply – By the middle cerebral artery.
  • Venous drainage – Into superficial middle cerebral vein.

The middle cerebral artery is the major artery supplying this area while the collosomarginal artery appears as a collateral artery in significant cases.

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