The rostrum is the thin front-lower part of the corpus callosum, curving backwards and downwards from the genu towards the anterior commissure. It continues as the lamina terminalis. It connects parts of the orbital surfaces of the frontal lobes.
| Location | Inferior-anterior end of the corpus callosum, below the genu and above the anterior commissure |
|---|---|
| Connections | |
| Blood Supply | Anterior cerebral artery (pericallosal and anterior communicating branches) |
Connects the orbital and inferior frontal regions of the two hemispheres.
The rostrum is the last part of the corpus callosum to form during development, so it is often missing in partial callosal agenesis. Its thinness makes it hard to see on imaging. It forms part of the floor of the frontal horn of the lateral ventricle.
Incomplete formation of the corpus callosum, usually missing the rostrum and splenium.
A lesion in the floor of the frontal horn of the lateral ventricle that may involve the rostrum.
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