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Updated: Aug 25, 2026

Fiber Connections of the Supplementary Motor Area Revisited: Methodology of Fiber Dissection, DTI, and Three Dimensional Documentation
Published on: May 23, 2017
Supracallosal longitudinal fiber bundle: heterotopic cingulum, dorsal fornix or Probst bundle?
1Institute of Neuropathology, Medizinische Hochschule Hannover, Germany. hori.akira@mh-hannover.de
Abstract:
A thick longitudinal fiber bundle found within the dorsal corpus callosum in two unrelated adults (in a micrencephalic female patient and incidentally in another male patient) is considered to be a congenital aberrant cingulum. Agenesis or apparent hypoplasia of the indusium griseum of the limbic-cingular system as an accompanying finding in the present cases may support this hypothesis. The dorsal fornix and Probst bundle are discussed in terms of differential diagnosis, although there was no further support for this possibility. The hyperplastic dorsocallosal gray substance is excluded.
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