Of, pertaining to or situated in the anterior part of the frontal lobe. / Of, pertaining to or situated in front of the frontal bone.

A prefrontal bone, scale, etc.

plural of prefrontal

In a prefrontal direction; in a prefrontal region

(neuroanatomy) The anterior part of the frontal lobes of the mammalian brain, lying in front of the motor and premotor areas.