Libelle of note

Although the terms Spatium subdurale and Spatium epidurale/extradurale are in common usage, under normal conditions the arachnoid is attached to the dura and the dura is attached to the skull; there are no naturally occurring spaces at these interfaces at all. The occurrence of these spaces is the result of trauma or of pathological process that artifactually separates the arachnoid from the dura or the dura from the skull (Haines DE 1991 On the question of a subdural space. Anat Rec 230:3-21; Van Denabeele F, Creemans J, Lambrichts I 1996 Ultrastructure of the human spinal arachnoid mater and dura mater. J Anat (Lond) 189:417-430).

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In monkeys, the Intraparietal sulcus contains numerous intraparietal areas (AIP, LIP, MIP, PIP and VIP), area PEip and area V6A (Rizzolatti G, Luppino G, Matelli M 1998 The organization of the cortical motor system: New concepts. Electroencephalogr Clin Neurophysiol 106:283-296). In the human brain, at least AIP and VIP areas have been identified (Seitz RJ, Binkofski F 2003 Modular organization of parietal lobe functions as revealed by functional activation studies. Adv Neurol 93:281-292).

Lateral to the Sulcus olfactorius, there are two longitudinally directed sulci, the Sulcus orbitalis medialis and the Sulcus orbitalis lateralis, which are joined together by the Sulcus orbitalis transversus to form the impression of an H or a K pattern (Duvernoy 1992; Petrides and Pandya 2012). The cingulate sulcus continues around the rostrum of the corpus callosum, where it is also known as the Sulcus rostralis superior. This sulcus may continue as the Sulcus rostralis inferior, which separates the straight gyrus from the medial surface of the frontal lobe.

The Sulcus frontomarginalis (Frontomarginal sulcus of Wernicke) is an important landmark in the frontal polar region (Duvernoy HM 1992 Le cerveau humain. Springer, Paris; Tamraz JC, Comair YG 2006 Atlas of Regional Anatomy of the Brain Using MRI. Springer, Berlin-Heidelberg-New York), and used as such in the DTI literature (Catani M, Thiebaut de Schotten M 2012 Atlas of Human Brain Connections. Oxford University Press, Oxford).

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The Sulcus intrarhinalis (Intrarhinal sulcus) is found between the Ambient gyrus and the Entorhinal cortex (see Duvernoy 1992; Insausti and Amaral 2012).

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The Sulcus intermedius primus (First intermediate sulcus of Jensen) may subdivide the Lobulus parietalis inferior into the Gyrus supramarginalis and the Gyrus angularis (Duvernoy 1992; Tamraz and Comair 2006). The Sulcus intermedius secundus (Second intermediate sulcus of Eberstaller) is found posterior to Jensen's sulcus.

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The Lobulus parietalis superior may be divided into an anterior and a posterior portion by the Sulcus parietalis transversus (Transverse parietal sulcus of Brissaud), originating on the medial side and extending to the lateral side of the hemisphere (see Tamraz and Comair 2006).