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Localization of the motor hand area to a knob on the precentral gyrus. A new landmark
Abstract
Using functional magnetic resonance imaging (fMRI) we have evaluated the anatomical location of the motor hand area. The segment of the precentral gyrus that most often contained motor hand function was a knob-like structure, that is shaped like an omega or epsilon in the axial plane and like a hook in the sagittal plane. On the cortical surface of cadaver specimens this precentral knob corresponded precisely to the characteristic 'middle knee' of the central sulcus that has been described by various anatomists in the last century. We were then able to show that this knob is a reliable landmark for identifying the precentral gyrus directly. We therefore conclude that neural elements involved in motor hand function are located in a characteristic 'precentral knob' which is a reliable landmark for identifying the precentral gyrus under normal and pathological conditions. It faces and forms the 'middle knee' of the central sulcus, is located just at the cross point between the precentral sulcus and the central sulcus, and is therefore also visible on the cortical surface.
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Metadata
- Authors
- Yousry, T.
- Venue
- Brain
- Publisher
- Oxford University Press (OUP)
- Published
- 1997-01-01
- Volume
- 120
- Issue
- 1
- Pages
- 141-157
- ISSN
- 0006-8950 (ISSN-L)
- 1460-2156
- OpenAlex
- W2098406191
- Cited by
- 1,837
- References
- 1
- FWCI
- 20.33
- Type
- journal article
- Language
- en
- Open access
- closed
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