Rostrum of corpus callosum
Rostrum corporis callosi
- Related terms: Rostrum
Definition
The rostrum of corpus callosum is the thin, inferiorly and posteriorly directed anterior part of the corpus callosum, situated below the genu. It represents the most inferior portion of the anterior corpus callosum.
It is continuous superiorly with the genu, while its thin posterior margin extends towards and becomes continuous with the lamina terminalis. Its commissural fibres principally connect orbital and ventromedial regions of the frontal lobes across the two cerebral hemispheres.
The rostrum contributes to interhemispheric frontal connectivity, allowing integration of information between corresponding and related frontal cortical regions.
Important distinction
The rostrum of corpus callosum should not be confused with the forceps minor. The forceps minor is formed predominantly by callosal fibres from the genu that curve anteriorly into the frontal lobes.
References
Goldstein A, Covington BP, Mahabadi N, et al. Neuroanatomy, Corpus Callosum. [Updated 2023 Apr 3]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2026 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK448209/
ScienceDirect Topics (n.d.) ‘Corpus callosum – an overview’. ScienceDirect. Available at: ScienceDirect Topics – Corpus Callosum (Accessed: 12 September 2026).
