The bilateral left cerebrum temporal lobe middle temporal gyrus gray matter corresponds to cortical tissue in the mid-portion of the temporal lobe, situated between the superior and inferior temporal gyri and extending longitudinally along the lateral aspect of the hemisphere. This region participates in higher-order auditory and language processing, semantic memory, and aspects of visual perception, including motion and object recognition, with left-hemisphere portions particularly implicated in lexical–semantic aspects of language and comprehension. Its cytoarchitecture is predominantly heteromodal association cortex, receiving convergent input from auditory, visual, and multimodal areas and projecting to frontal and limbic regions, supporting integrative functions such as narrative understanding and social cognition. A closely related and encompassing structure is described at Middle temporal gyrus.
The bilateral left middle temporal gyrus gray matter has been implicated in multiple genetic and GWAS findings, especially those related to language, semantic processing, social cognition, and psychiatric risk. Twin and heritability studies consistently show moderate to high genetic influence on cortical thickness and surface area in the temporal lobe, including the middle temporal gyrus, with common variants identified in large imaging-genetics consortia (e.g., ENIGMA and UK Biobank) mapping to neurodevelopmental, synaptic, and axon guidance pathways. GWAS of cortical regional measures have associated loci near genes such as KIAA0586, DACT1, WNT family members, and other regulators of cortical patterning with structural variation in temporal regions that encompass the middle temporal gyrus. Functionally, the left middle temporal gyrus is a key node of language and semantic networks, and genetic studies of reading ability, dyslexia, and language impairment (including variants in FOXP2 and CNTNAP2) have been linked to altered activation and structure in this area. Psychiatric and neurodevelopmental GWAS—particularly for schizophrenia, autism spectrum disorder, and major depressive disorder—have shown that polygenic risk scores correlate with reduced gray matter volume or cortical thinning in temporal regions including the middle temporal gyrus, while risk loci in synaptic and immune-related genes (e.g., complement pathway genes) contribute to these structural and functional changes. In neurodegenerative disease, variants in APOE and other Alzheimer’s disease risk genes have been associated with accelerated atrophy and hypometabolism in temporal cortices, including the middle temporal gyrus, which is involved in episodic memory and semantic network disruption in prodromal and mild cognitive impairment stages. Overall, genetic influences on this region converge on neurodevelopmental patterning, synaptic signaling, and vulnerability to language-related and psychiatric phenotypes.
Overview generated by GPT-4o (2026).
Region ID: 528
Hemisphere: bilateral
Atlas: Talairach labels 2mm
Full Quality Version: Download MP4
Full Quality Version: Download MP4
Wali Sidiqyar*, Gaurav Rudravaram*, Elyssa M. McMaster, Trent M. Schwartz, Adam M. Saunders, Kurt G. Schilling, Bennett A. Landman "Introducing SPINS: A Shared Public Visualization Library of Neuroanatomical Structures." Medical Imaging with Deep Learning- short paper
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