Morphologic study of the hand motor cortex based on MRI

Objective: To locate and analyze the morphology features of the hand motor cortex. Methods: The brains of 48 right-handed healthy people were scanned using MRI. The MRI imagings of transection plane, sagittal plane, coronal plane from 96 cerebral hemispheres were collected, which was used to identify, locate and analyze the morphology features of the hand motor cortex. Results: The hand motor cortex were classified into the inverted omega, omega, medially nonsymmetric omega, laterally nonsymmetric omega, curve, clover and wave types. The differences of the constituent ratio of various types between male and female, and between bilateral cerebral hemispheres of male and female were not statistically significant(P>0.05). The width of the inverted omega type in male was significantly more than that in female(P<0.01). Conclusions: Improving the procentral knob motor cortex typing can provide the basis in identifing precentral gyrus.