|Brain: Operculum (brain)|
The insula of the left side, exposed by removing the opercula
|Latin||operculum frontale, operculum parietale, operculum temporale|
In human brain anatomy, an operculum (Latin, meaning "little lid") (pl. opercula), may refer to the frontal operculum, part of the frontal lobe, or to the parietal operculum, part of the parietal lobe, or to the temporal operculum, part of the temporal lobe, which together cover the insula as the opercula of insula. 1 It can also refer to the occipital operculum, part of the occipital lobe. The insular lobe is a portion of the cerebral cortex that has invaginated to lie deep within the lateral sulcus. The insular lobe sits like an island (the meaning of insular) almost surrounded by the groove of the circular sulcus and covered over and obscured by the insular opercula. A part of the parietal lobe, the frontoparietal operculum, covers the upper part of the insular lobe from the front to the back.2 The opercula lie on the precentral and postcentral gyri (on either side of the central sulcus).3
The part of the parietal operculum that forms the ceiling of the lateral sulcus functions as the secondary somatosensory cortex.
Normally, the insular opercula begin to develop between the 20th and the 22nd weeks of pregnancy. At weeks 14 to 16 of fetal development, the insula begins to invaginate from the surface of the immature cerebrum of the brain, until at full term, the opercula completely cover the insula.4
Contrary to the literature, Einstein’s brain is not spherical and has non-confluent Sylvian and inferior postcentral sulci.5
Einstein's lower parietal lobe (which is responsible for mathematical thought, visuospatial cognition, and imagery of movement) was 15% larger than average.
- Dorland 2012, p. 1328
- Dorland 2012, p. 1327
- Joseph M. Tonkonogy; Antonio E. Puente (23 January 2009). Localization of Clinical Syndromes in Neuropsychology and Neuroscience. Springer Publishing Company. p. 392. ISBN 978-0-8261-1967-4. Retrieved 12 October 2012.
- Larroche JC. (1977) "Development of the central nervous system". Developmental Pathology of the Neonate. Amsterdam, the Netherlands: Excerpta Medica; 1977:319–327, cited as Note 3 of
- Cheng-Yu Chen, Robert A. Zimmerman, Scott Faro, Beth Parrish, Zhiyue Wang, Larissa T. Bilaniuk, and Ting-Ywan Chou (1996), "MR of the Cerebral Operculum: Abnormal Opercular Formation in Infants and Children" American Journal of Neuroradiology, AJNR Am J Neuroradiol 17:1303–1311, August 1996
- Falk 2012, p. 22
- Dorland (2012), Dorlands Illustrated Medical Dictionary (32nd ed.), ISBN 978-1-4160-6257-8
- Falk (2012), "The cerebral cortex of Albert Einstein: a description and preliminary analysis of unpublished photographs", Brain (Oxford University Press), retrieved 1 December 2012
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