- The posterior commissure lies in the inferior lamina of the stalk of the pineal body.
- A number of small nuclei are present in relation to the commissure:
- Interstitial and dorsal nuclei of the posterior commissure,
- Nucleus of Darkschewitsch
- Interstitial nucleus of Cajal
- Some fibres arising from these nuclei pass through the posterior commissure.
- Other fibres continue into it from the medial longitudinal bundle.
- Some fibres arising in the thalamus, the tectum, and the pretectal nuclei also pass through the posterior commissure.
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