middle frontal sulcus

(redirected from sulcus frontomarginalis)

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.