Inferior_Frontal_Gyrus

http://www.semanticweb.org/rjyy/ontologies/2015/5/ESSO#Inferior_Frontal_Gyrus

Inferior_Frontal_Gyrus

Tancred 2005 The triangular and opercular parts of the inferior frontal gyrus of the dominant hemisphere form Broca's motor speech area, which controls the production of the correct sounds in speech. Structures: Central Sulcus Cerebral Hemisphere Cingulate Gyrus Corpus Callosum Gyrus Rectus Inferior Frontal Gyrus Inferior Frontal Sulcus Lateral Fissure Limbic Area Middle Frontal Gyrus Motor Speech (Broca's) Area Olfactory Sulcus Olfactory Tract Orbital Gyri Pars Opercularis (Inf. Fr. G.) Pars Orbitalis (Inf. Fr. G.) Pars Triangularis (Inf. Fr. G.) Precentral Gyrus Precentral Sulcus Prefrontal Area Premotor Area Primary Motor Area Superior Frontal Gyrus Superior Frontal Sulcus Triangular Sulcus Information: The frontal lobe occupies the anterior part of the cerebral hemisphere. Boundaries: On the lateral surface it extends from the frontal pole posteriorly to the central sulcus and is bounded inferiorly by the lateral fissure. On the medial surface it extends posteriorly to an imaginary line from the central sulcus to the corpus callosum. Sulci and Gyri: The superolateral surface of the frontal lobe is formed by the superior, middle and inferior frontal gyri which extend in an anteroposterior direction and the precentral gyrus which extends vertically downwards. The superior and inferior frontal gyri are separated by the superior frontal sulcus and the middle and inferior gyri are separated by the inferior frontal sulcus. The precentral sulcus separates the precentral gyrus from the frontal gyri. The inferior frontal gyrus is divided from anterior to posterior into the pars orbitalis, pars triangularis and pars opercularis by the triangular sulcus. The superior frontal gyrus extends onto the medial surface as far as the cingulate gyrus, the anterior part of which is also included in the frontal lobe. The inferior surface of the frontal lobe is formed by the orbital gyri, which overlie the bony roof of the orbit and gyrus rectus (most medially). The orbital gyri and gyrus rectus are separated by the olfactory sulcus, which contains the olfactory tract. Functional Areas: The frontal lobe includes a number of important functional areas: (1) Primary motor area - located on the precentral gyrus. (2) Premotor area - located on the anterior part of the precentral gyrus and the adjacent parts of the superior and middle frontal gyri. (3) Prefrontal area - which includes the remainder of the superior and middle frontal gyri, the orbital part of the inferior frontal gyrus and the orbital gyri. (4) Motor Speech (Broca's) Area - located on the triangular and opercular parts of the inferior frontal gyrus. (5) Limbic Area - located on the cingulate gyrus.

http://www.semanticweb.org/rjyy/ontologies/2015/5/ESSO#Frontal_Lobe