The interthalamic adhesion (massa intermedia) is a small band of grey matter that crosses the third ventricle to join the two thalami. It is present in about 70-80% of people and is often larger in women.
| Location | Middle of the third ventricle, between the medial surfaces of the two thalami |
|---|---|
| Parts |
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| Connections |
|
| Blood Supply | Posterior cerebral artery (thalamoperforating and thalamogeniculate branches); Posterior communicating artery |
Function uncertain; it contains a few crossing fibres between the thalami.
It is a visible landmark during third ventricle endoscopy and on midline MRI. It may be enlarged in Chiari II malformation and absent more often in some psychiatric conditions in research studies.
Hindbrain malformation in spina bifida often with an enlarged interthalamic adhesion.
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