The lateral occipitotemporal gyrus (fusiform gyrus) lies on the basal surface of the temporal and occipital lobes. It forms part of Brodmann area 37, along with the inferior and middle temporal gyri. It is composed of a temporal or anterior portion (T4) and an occipital or posterior portion (O4). It is delineated medially by the collateral sulcus and laterally by the occipitotemporal sulcus.
Anatomically, the fusiform gyrus is the largest macro-anatomical structure within the ventral temporal cortex. The term fusiform gyrus (lit. "spindle-shaped convolution“) refers to the fact that the shape of the gyrus is wider at its centre than at its ends. This term is based on the description of the gyrus by Emil Huschke in 1854. The fusiform gyrus is situated at the basal surface of the temporal and occipital lobes and is delineated by the collateral sulcus (CoS) and occipitotemporal sulcus (OTS), respectively. The OTS separates the fusiform gyrus from the inferior temporal gyrus (located laterally in respect to the fusiform gyrus) and the CoS separates the fusiform gyrus from the parahippocampal gyrus (located medially in respect to the fusiform gyrus).
The lateral occipitotemporal gyrus has two components: