Certain developmental relations and fiber connections of the triangular gyrus in primates

The foundation f o r most of our knowledge of the cortical aspects of speech was laid by the work on aphasia of various early observers such as Broca (1861a, 1861b), Jackson (Head, '15), Wernicke (1874), and Marie ( '06a, '06b, ' O ~ C ) , and more recently Goldstein ( '26), Head ( '26) , Weisenberg and &Bride ('35) and Nielsen ('47). Apart from their studies little attention has been given to the neurological patterns involved either in normal speech or in speech disorders. It is the purpose of this paper to present certain anatomical observations which are related to this subject. Fundamental to an understanding of either normal or pathological speech is a knowledge of the development of the so-called speech centers of the brain with their relations to the rest of the developing cortex and, most especially, of their fiber connections. The results presented in this paper, although not complete, provide a basis for further research on the speech centers. It is planned to continue this line of investigation as suitable human material becomes available.

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