Short official Latin term

Libelle of note

The Gyrus cingularis (Cingulate gyrus) can at least be divided into an Anterior, a Posterior and a Retrosplenial part. Vogt BA, Palomero-Gallagher N (2012 Cingulate cortex. In: Mai JK, Paxinos G, eds: The Human Nervous System, 3rd ed. Elsevier, Amsterdam, pp 943-987) added a Midcingulate cortex.

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The Uncus is treated in various ways: 1) as the rostral part of the Parahippocampal gyrus; 2) as a structure on its own. TNA suggests the latter. Insausti R and Amaral DG (2012 Hippocampal formation. In: Mai JK, Paxinos G, eds: The Human Nervous System, 3rd ed. Elsevier, Amsterdam, pp 896-942) advocated to restrict the term Uncus to the Gyrus uncinatus, the Band or limbus of Giacomini and the Gyrus intralimbicus (or Uncal apex). The Sulcus semianularis (Semi-anular sulcus) separates the Ambient and Semilunar sulci (see Duvernoy HM 1992, 1998 The Human Hippocampus, 2nd ed. Springer, Berlin-Heidelberg-New York). The Gyrus uncinatus is the most rostral part of Uncal bulge, according to Insausti and Amaral (2012) and part of field CA1. The Limbus fasciae dentatae (Band of dentate gyrus) is the Middle part of the Uncus, first described by Giacomini CH (1884 Fascia dentata du grand hippocampe dans le cerveau de l'homme. Arch Ital Biol 5:1-16, 205-209, 396-417) and part of the Dentate gyrus. The Gyrus intralimbicus (Intralimbic gyrus or Uncal apex) is the most caudal part of the Uncal bulge and part of field CA3.

The Cortex perirhinalis (Perirhinal cortex) is also not included in TA; for description, see Augustinack JC, Huber KE, Stevens AA, et al. (2013 Predicting the location of human perirhinal cortex, Brodmann's area 35, from MRI. Neuroimage 64:32-42).

Field CA4 appears to correspond most closely to the polymorph zone of the Dentate gyrus, and, therefore, is not a field of the Hippocampus at all. Amaral and Insausti (Amaral DG, Insausti R 1990 Hippocampal formation. In: Paxinos G, ed: The Human Nervous System. Academic Press, San Diego, CA, pp 711-755) suggested the term 'CA3h' for the pyramidal cells within the hilus ('h'), continuous with CA3.

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In the French literature, for the Inner ring of the Limbic lobe the term Gyrus intralimbicus is used. In the German literature, however, this term is used for the Uncal apex.

The Cortex entorhinalis (Entorhinal cortex) is not included in TA; for description, see Braak H, Braak E (1992 The human entorhinal cortex: Normal morphology and lamina-specific pathology in various diseases. Neurosci Res 15:6-31. The Substantia reticularis alba (White reticular substance of Arnold) is the white matter surrounding the darker patches of Layer 2 cell islands. The Verrucae hippocampi (Hippocampal warts) are located above these cell islands and described by Retzius G (1896 Das Menschenhirn: Studien in der makroskopischen Morphologie. Norstedt, Stockholm) and Klingler J (1948 Die makroskopische Anatomie der Ammonsformation. Denkschr Schweiz Naturforsch Ges, Vol 78, Fretz, Zürich). They mark the surface of the Entorhinal cortex.

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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 Dentes subiculi (Gyri of Andreas Retzius) were described by Retzius (1896) for the Caudal part of CA1 at the Hippocampal tail; the term Gyri subspleniales (Subsplenial gyri) indicate their position. Deep to the Gyri andreae retzii, two obliquely oriented small gyri are found (Duvernoy 1998; Insausti and Amaral 2012): 1) a medial gyrus: the Fasciola cinerea, which forms the visible part of the Dentate gyrus as descibed by Giacomini (1884) and Klingler (1948); and 2) a lateral gyrus: Gyrus fasciolaris (Fasciolar gyrus), corresponding to the caudal end of the CA3 field.

The complex Cortex retrosplenialis (Retrosplenial cortex) consists of Periarchicortical (BA26) and Proisocortical (BA29, 30) areas (Braak H 1980 Architectonics of the Human Telencephalic Cortex. Springer, Berlin-Heidelberg-New York; Zilles and Amunts 2012). The TH nomenclature (H4.8.03.122/129) seems to combine these different structures. The Cortex ectosplenialis (Ectosplenial cortex; BA26) has a primitive three-laminar pattern with Molecular, Densocellular and Multiform layers. The Cortex retrosplenialis granularis (Granular retrosplenial cortex; BA29) shows a four-layered structure: Molecular, External and Internal pyramidal and Multiform layers. The Cortex retrosplenialis dysgranularis (Dysgranular retrosplenial cortex; BA 30) shows a further progression of laminar differentiation with an additional (Internal) granular layer.

In the Regio periamygdaloidea (Periamygdaloid region) according to Brockhaus H (1940 Zur normalen und pathologischen Anatomie des Mandelkerngebietes. J Psychol Neurol (Lpz) 49:1-136) and Stephan (1975) only two layers can be distinguished.