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      Direct optic nerve pulvinar connections defined by diffusion MR tractography in humans: implications for photophobia.

      Human Brain Mapping

      Adult, Brain Mapping, Diffusion Tensor Imaging, Female, Humans, Image Processing, Computer-Assisted, Male, Optic Nerve, physiology, Photophobia, physiopathology, Pulvinar, Visual Pathways

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          Abstract

          The pathway that underlies exacerbation of migraine headache by light has not been elucidated in the human brain but has recently been reported in a rodent model. We employ diffusion weighted imaging and probabilistic tractography to map connectivity of direct pathways from the optic nerve to the pulvinar implicated with whole-body allodynia during migraine. Nine healthy subjects were recruited to the study and underwent scanning on a 3T magnet. We were able to define well-known image-forming (optic nerve -> lateral geniculate -> visual cortex) as well as a less known nonimage forming visual pathway from the optic chiasm to the pulvinar, and from the pulvinar to several associative cortical brain regions. Such pathway may allow photic signals to converge on a thalamic region we described recently to be selectively activated during migraine headache. Consistent with physiological and anatomical studies in rats, the data provide an anatomical substrate for exacerbation of migraine headache by light in the human. Copyright © 2011 Wiley Periodicals, Inc.

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          Author and article information

          Journal
          21337474
          3711521
          10.1002/hbm.21194

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