The precentral sulcus lies parallel to, and in front of, the central sulcus

Central sulcus

-External links:* via the Neuroscience Information Framework...

. (A sulcus is one of the prominent grooves on the surface of the human brain

Brain

The brain is the center of the nervous system in all vertebrate and most invertebrate animals—only a few primitive invertebrates such as sponges, jellyfish, sea squirts and starfishes do not have one. It is located in the head, usually close to primary sensory apparatus such as vision, hearing,...

.)

The precentral sulcus divides the inferior

Inferior frontal gyrus

The inferior frontal gyrus is a gyrus of the frontal lobe . It is labelled gyrus frontalis inferior, its Latin name...

, middle

Middle frontal gyrus

The middle frontal gyrus makes up about one-third of the frontal lobe of the human brain....

, and superior

Superior frontal gyrus

The superior frontal gyrus makes up about one-third of the frontal lobe of the human brain. It is bounded laterally by the superior frontal sulcus....

 frontal gyri from the precentral gyrus. In the majority of brains, the precentral sulcus is divided into two parts: the inferior precentral sulcus and the superior precentral sulcus. However, the precentral sulcus may also be divided into three parts or form one continuous sulcus.