Anatomy and White Matter Connections of the Middle Temporal Gyrus Robert G

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Anatomy and White Matter Connections of the Middle Temporal Gyrus Robert G. Briggs BS; Adam Bouvette BS; Camille K Milton BS; Ali Palejwala MD; Andrew K.P. Conner MD; Christopher D Anderson BA; Carol J Abraham BS; Goksel Sali; Daniel L O'Donoghue; James D Battiste; Michael Edward Sughrue MD Introduction Results The middle temporal gyrus (MTG) is understood to play a role in language- We identified two major white matter bundles leaving the MTG: the inferior related tasks such as lexical comprehension and semantic cognition. For longitudinal fasciculus (ILF) and superior longitudinal fasciculus (SLF). The ILF example, this gyrus is important for understanding visual and auditory courses posteriorly from the anterior pole of the MTG to the lingual and cuneal messages, and is thought to utilize contextual knowledge to retrieve relevant gyri, passing deep to the SLF which courses from the MTG underneath the semantic information required for these tasks. A detailed description of the inferior parietal lobule to parts of the superior, middle and inferior frontal gyri. underlying white matter tracts associated with the MTG could prove useful in In addition to long association fibers, a unique linear sequence of u-shaped refining our understanding of semantic function and its preservation. Through fibers was identified in the MTG possibly representing a form of visual semantic DSI-based fiber tracking validated by gross anatomical dissection as ground transfer down the temporal lobe. truth, we have characterized the underlying white matter connections of the MTG based on their relationships to other well-known structures. Conclusions The MTG is an important center for semantic processing. Subtle differences in Methods language function following surgery for temporal lobe tumors may be better Diffusion imaging from the Human Connectome Project for 10 healthy adult understood in the context of the fiber-bundle anatomy highlighted by this study. controls was used for tractography analysis. We evaluated the MTG as a whole based on connectivity with other regions. All tracts were mapped in Learning Objectives both hemispheres, and a lateralization index was calculated with resultant By the conclusion of this session, participants should be able to define the key tract volumes. Ten postmortem dissections were performed using a white matter tracts connecting to the middle temporal gyrus and understand the modified Klingler technique to demonstrate the location of these tracts. different models of ventral semantic transfer. [Default Poster].

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