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PT  - JOURNAL ARTICLE
AU  - Caulo, M.
AU  - Briganti, C.
AU  - Mattei, P.A.
AU  - Perfetti, B.
AU  - Ferretti, A.
AU  - Romani, G.L.
AU  - Tartaro, A.
AU  - Colosimo, C.
TI  - New Morphologic Variants of the Hand Motor Cortex as Seen with MR Imaging in a Large Study Population
AID  - 10.3174/ajnr.A0597
DP  - 2007 Sep 01
TA  - American Journal of Neuroradiology
PG  - 1480--1485
VI  - 28
IP  - 8
4099  - http://www.ajnr.org/content/28/8/1480.short
4100  - http://www.ajnr.org/content/28/8/1480.full
SO  - Am. J. Neuroradiol.2007 Sep 01; 28
AB  - BACKGROUND AND PURPOSE: The hand motor cortex (HMC) has been classically described as having an omega or epsilon shape in axial-plane images obtained with CT and MR imaging. The aim of this study was to use MR imaging and Talairach normalization in a large sample population that was homogeneous for age and handedness to evaluate in a sex model a new classification with 5 morphologic variants of the HMC in the axial plane (omega, medially asymmetric epsilon, epsilon, laterally asymmetric epsilon, and null).MATERIALS AND METHODS: Structural brain MR images were obtained from 257 right-handed healthy subjects (143 men and 114 women; mean age, 23.1 ± 1.1 years) via a Talairach space transformed 3D magnetization-prepared rapid acquisition of gradient echo sequence. The frequencies of the different HMC variants were reported for hemisphere and sex.RESULTS: The new variants of the HMC (medially asymmetric epsilon, laterally asymmetric epsilon, and null) were observed in 2.9%, 7.0%, and 1.8% of the hemispheres, respectively. Statistically significant sex differences were observed: The epsilon variant was twice as frequent in men, and an interhemispheric concordance for morphologic variants was observed only for women.CONCLUSION: The large study population permitted the description of a new morphologic classification that included 3 new variants of the HMC. This new morphologic classification should facilitate the identification of the precentral gyrus in subsequent studies and in everyday practice.