By John C. Eccles, J. P. Schade

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The fibres of this bundle enter the tip of the dorsal horn where they break up into terminal branches, contributing to a dense meshwork, the dorsal neuropil of Silver (1942). The medial division of the dorsal roots is made up by heavily medullated fibres, which enter the dorsal funiculus and there dichotomize into ascending and descending branches. From these branches a great number of collaterals arise which, running ventrally, penetrate into the gray substance. , 1936) believed that in the adult frog a number of these sensory collaterals are in synaptic relation with the ventral horn cells, but there is no general agreement on this point.

All students of the lamprey’s brain agree that the Miiller fibres originate from cell bodies situated in the midbrain and in the medulla oblongata, but there is some disagreement concerning the size and the exact location of these cells. Johnston (1902) traced the fibres of Miiller ‘with ease’ to a number of large cells scattered among the motor elements of the brain stem, but Tretjakoff (1 909a) found that their cells of origin vary in size and are grouped in about 6 agglomerations, which form a chain extending from the midbrain to the level of the vagus nerve.

This latter was first described by Mauthner (1 859) as ‘Eine kolossale markhaltige Nervenfaser, welche sich durch den ganzen Verlauf des Ruckenmarkes erstreckt’. Some 30 years later Goronowitsch (1888) showed that the Mauthner fibres originate from 2 large cells, lying close to the acustico-lateral area in the brain stem. The myelin sheath of these fibres is, just as the axon, very thick but the lamellae which constitute the sheath are unusually loosely Fig. 16. Motor neuron in the cord of the lungfish, Protopterus dolloi.

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