Rosette Homer Wright rosette 2018-07-04T13:24:50Z The delicate fibrillary material found within the central lumen of the Homer Wright rosette is composed of neuropil, which contains primitive neuronal processes or neurites. The typical Homer Wright rosette with its central lumen or hub filled with fiber-like processes can also be found in medulloblastomas and histologically similar tumors occurring outside of the cerebellum, designated PNETs. A type of rosette in which the central lumen or hub is filled with fiber-like processes.