The belt areas of the auditory cortex receive more diffuse input from the belt areas of the medial geniculate complex and therefore are less precise in their tonotopic organization. The primary auditory cortex (A1) receives point-to-point input from the ventral division of the medial geniculate complex thus, it contains a precise tonotopic map 2.
The primary auditory cortex (A1) is located on the superior temporal gyrus called Heschl’s gyrus, a ridge in the temporal lobe, on the lower lip of the deep cleft between the temporal and parietal lobes, known as the lateral sulcus (Sylvian fissure) 1. These structures are formed concentrically around one another, with the primary auditory cortex in the middle and the tertiary auditory cortex on the outside. Although the auditory cortex has a number of subdivisions, a broad distinction can be made between a primary auditory cortex, secondary auditory cortex (peripheral area) and tertiary auditory cortex (belt area) (Figure 1). The primary auditory cortex is the region of the brain that is responsible for processing of auditory (sound) information. It lies in the posterior half of the superior temporal gyrus and also dives into the lateral sulcus as the transverse temporal gyri also called Heschl’s gyri. The primary auditory cortex is about the same as Brodmann areas 41 and 42. The auditory cortex is located on the lateral surface in the temporal lobe of the brain. Secondary auditory cortex function Auditory cortex
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