Chi J G, Dooling E C, Gilles F H
Arch Neurol. 1977 Jun;34(6):346-8. doi: 10.1001/archneur.1977.00500180040008.
Left-right asymmetries of the transverse temporal (Heschl) gyri and the temporal plane become recognizable by 31 weeks' gestation. The transverse temporal gyri are larger in number and extent on the right side in 54% of 207 serially sectioned fetal brains ranging in gestational age from 10 to 44 weeks, and the temporal plane is larger on the left side in those brains. There are two transverse temporal gyri on the left and a single right transverse temporal gyrus on the right in 18% of the brains. No asymmetry of number of transverse temporal gyri or extent of the temporal plane is apparent in 28%. These findings, which confirm those in adult brains, suggest that anatomical asymmetries for left hemispheral speech and language dominance may be established during the last trimester of fetal life.
颞横（Heschl）回和颞平面的左右不对称在妊娠31周时变得可识别。在207例连续切片的胎脑中，胎龄为10至44周，54%的胎儿右侧颞横回在数量和范围上更大，而在这些胎脑中左侧颞平面更大。18%的脑左侧有两个颞横回，右侧有一个单独的颞横回。28%的脑颞横回数量或颞平面范围无明显不对称。这些与成人大脑研究结果相符的发现表明，左半球语言优势的解剖学不对称可能在胎儿期的最后三个月确立。
