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Liliequist membrane

Liliequist membrane is an arachnoid membrane arising from the diaphragmatic sellae to the anterior edge of the mamillary body and laterally described as attached to the oculomotor nerve (CN III). There is some disagreement concerning the sites of the superior attachment and its lateral border 6

Recently up to 27 subarachnoid membranes have been identified. Liliequist membrane is one of the earliest described subarachnoid membranes. This membrane is not routinely visualised in imaging studies as it is very thin. However it can be visualised on MRI CISS heavily T2 weighted 3D sequences. Chiasmatic and perimesencephalic cisterns are separated by this membrane.

This membrane has neurosurgical importance, especially in endoscopic and microinvasive surgery.

History and etymology

It was thought to be described by Key and Retzius in 1875, but rediscovered by Liliequist in 1956 in his pneumoencephalographic studies of cadavers.


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Neuroanatomy

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