middle frontal sulcus
(redirected from sulcus frontalis medius)mid·dle fron·tal sul·cus
a relatively shallow sagittal fissure of the brain dividing the middle frontal convolution into an upper and lower part; this sulcus is found only in humans and anthropoid apes; at its anterior extremity it bifurcates, the two branches spreading out laterally and constituting the frontomarginal sulcus.
Synonym(s): sulcus frontalis medius