Indusium griseum

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Indusium griseum
Gray732.png
Scheme of rhinencephalon. (Indusium griseum labelled as gyrus supracallosus at center top.)
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Corpus callosum from above.
Identifiers
NeuroNames 173
NeuroLex ID birnlex_1316
TA98 A14.1.09.246
TA2 5526
FMA 62488
Anatomical terms of neuroanatomy

The indusium griseum, (supracallosal gyrus, gyrus epicallosus, dorsal hippocampal continuation) [1] consists of a thin membranous layer of grey matter in contact with the upper surface of the corpus callosum and continuous laterally with the grey matter of the cingulate cortex and inferiorly with the hippocampus. It is vestigial in humans and is a remnant of the former position of the hippocampus in lower animals.

On either side of the midline of the indusium griseum are two ridges formed by bands of longitudinally directed fibers known as the medial and lateral longitudinal striae. [2]

The indusium griseum is prolonged around the splenium of the corpus callosum as a delicate layer, the fasciolar gyrus, (also gyrus fasciolaris) [3] which is continuous below with the surface of the dentate gyrus. [4] The indusium griseum and fasciolar gyrus are very small components of the limbic lobe, and are continuations of the hippocampal formation, forming an unremarkable thin continuous ring of grey matter at the edge of the cortex. [4]

Toward the genu of the corpus callosum it curves down along the rostrum to form the subcallosal gyrus. [5]

References

PD-icon.svgThis article incorporates text in the public domain from page 827 of the 20th edition of Gray's Anatomy (1918)

  1. Cleland, Thomas A.; Linster, Christiane; Haberland, G. (2019). "Central olfactory structures". Handbook of Clinical Neurology. 164: 79–96. doi:10.1016/B978-0-444-63855-7.00006-X.
  2. Di Ieva, A; Fathalla, H; Cusimano, MD; Tschabitscher, M (January 2015). "The indusium griseum and the longitudinal striae of the corpus callosum". Cortex. 62: 34–40. doi:10.1016/j.cortex.2014.06.016. PMID   25091482. S2CID   1246791.
  3. "fasciola gyrus". TheFreeDictionary.com.
  4. 1 2 Kiernan, JA (2012). "Anatomy of the temporal lobe". Epilepsy Research and Treatment. 2012: 176157. doi: 10.1155/2012/176157 . PMC   3420617 . PMID   22934160.
  5. Naidich, Thomas P.; Castillo, Mauricio; Cha, Soonmee; Smirniotopoulos, James G. (31 October 2012). Imaging of the Brain, Expert Radiology Series,1: Imaging of the Brain. Elsevier Health Sciences. ISBN   978-1416050094.