Middle Frontal Gyrus
The middle frontal gyrus is separated inferiorly from the portion of the cingulate gyrus within the frontal lobe by the cingulate sulcus. The posterior end of the medial frontal gyrus and the anterior half of the paracentral lobule are separated by a rising branch of the cingulate sulcus that is called the paracentral sulcus.
The middle frontal gyrus is one of four such gyri in the frontal lobe. These series of convolutions called gyri (singular, gyrus) are perhaps the most distinguishing feature of the external cerebral surface. Between them are grooves of varying depth called sulci (singular, sulcum) or fissures. The frontal lobe is crossed over by three sulci, which divide it into four gyri. These are the precentral, superior frontal, and inferior frontal sulci and the precentral, superior frontal, middle frontal, and inferior frontal gyri.
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