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The angular gyrus is a portion of the parietal lobe of the brain. It is one of the two parts of the inferior parietal lobule, the other part being the supramarginal gyrus. It plays a part in language and number processing, memory and reasoning 1.
It lies as a horseshoe shaped gyrus capping the angular sulcus, a continuation of the upswing of the superior temporal sulcus. It is bound by the intraparietal sulcus superiorly, parieto-occipital sulcus caudally and supramarginal gyrus rostrally.
It is supplied by the middle cerebral artery.
The angular gyrus sign 2 suggests that the gyrus capping the posterior end of the superior temporal sulcus is the angular gyrus. This sulcus can be identified as it lies in parallel with the lateral sulcus.
Damage to the angular gyrus has been shown to cause agraphia, alexia, Gerstmann syndrome and behavioral changes3.
- 1. Seghier ML. The angular gyrus: multiple functions and multiple subdivisions. Neuroscientist. 2012;19 (1): 43-61. doi:10.1177/1073858412440596 - Free text at pubmed - Pubmed citation
- 3. Nagaratnam N, Phan TA, Barnett C et-al. Angular gyrus syndrome mimicking depressive pseudodementia. J Psychiatry Neurosci. 2002;27 (5): 364-8. Free text at pubmed - Pubmed citation
- 2. Naidich TP, Castillo M, Cha S et-al. Imaging of the Brain,Expert Radiology Series,1. Saunders. (2012) ISBN:1416050094. Read it at Google Books - Find it at Amazon