Rosehip neuron 

A type of human brain cell with a distinctive appearance that looks similar to a rosehip (the fruit of the rose plant)

One reason rosehip neurons eluded neuroscientists for so long is likely because the cells are so rare in the brain, Bakken said. Another reason, he added, is because human brain tissue is difficult for scientists to obtain for study. Indeed, in the study, the researchers examined only one layer of the brain. It’s possible, however, that rosehip neurons could be found in other layers, too, Bakken said.

Rosehip neuron by Corona Australis February 12, 2019