Medial longitudinal stria

The medial longitudinal stria is a slender longitudinal bundle of myelinated fibres embedded within the indusium griseum close to the sagittal midline on the dorsal surface of the corpus callosum. Like the lateral longitudinal stria, it represents supracallosal fibres of the fornix and forms part of the residual hippocampal/limbic structures lying above the corpus callosum.

The medial longitudinal stria runs close to its counterpart from the opposite side for much of its course.

• Anteriorly, the striae converge and curve around the genu and rostrum toward the paraterminal gyri.

• Posteriorly, they diverge around the splenium, where each medial stria joins the corresponding lateral stria and continues into the fasciolar gyrus.