The lamina terminalis is a thin sheet of grey matter and pia that forms the front wall of the third ventricle. It stretches from the optic chiasm up to the anterior commissure and marks the front end of the embryonic neural tube.
| Location | Anterior wall of the third ventricle, between the optic chiasm and the anterior commissure |
|---|---|
| Parts |
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| Connections |
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| Blood Supply | Anterior cerebral artery; Anterior communicating artery |
Closes the front of the third ventricle and contains a circumventricular organ that senses blood salt concentration.
Surgeons may open the lamina terminalis (fenestration) to drain fluid into the subarachnoid space during aneurysm surgery, and it is a route to some third ventricle tumours. It lies close to anterior communicating artery aneurysms.
The commonest site of brain aneurysm, lying just in front of the lamina terminalis.
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