Head Injury from Antiquity to the Present with Special Reference to Penetrating Head Wounds

animals. Here they present evidence for interneuronal mechanisms within the ventrobasal thalamus. This provides an anatomical substrate for the numerous excitatory, inhibitory, and recurrent collateral mechanisms delineated neurophysiologically by D. Purpura, and by T. Frigyesi and R. Schwartz. A grand overview of the role of cerebral cortex in the modulation of input to the medial thalamus at thalamic and at spinal levels is presented by D. Albe-Fessard and her associates. An intensive analysis of corticifugal mechanisms in learned movement (E. V. Evarts), in contact placing (V. E. Amassian and associates), on eye movements (B. Cohen), and upon the ventrolateral thalamic nucleus (J. Massion and L. RispalPadel) are presented extensively, as are other studies dealing with cerebellofugal mechanisms, corticotectal projections, and retroflexive visual cortical projections to lateral geniculate body. An overall hypothesis of thalamic function, based upon human pathyphysiologic anatomical analysis is presented by R. Hassler. The work which includes edited discussions, is exemplary in its execution, and will serve as a substantial source for reference, both as to substance and hypothesis, in this complex field.