fasciculus circumolivaris pyramidis

fas·cic·u·lus cir·'cum·o·li·va·'ris py·ra·m'i·dis

an anomalous bundle of nerve fibers on the anterior surface of the medulla oblongata that emerges from the pyramid and curves forward and dorsally over the lower pole of the olive; it is variously interpreted as an aberrant bundle of pontocerebellar fibers or corticopontine fibers.