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The Origin of the Acoustic Ganglion in the Sheep

Department of Physiology, University of Bristol

¹ Author's address: Department of Physiology, The University, Bristol 8, U.K.

Received for publication 11 April 1958.

SUMMARY

It has long been customary to regard the VII and VIII ganglia in the mammal as originating from a common primordium—the acustico—facial crest—probably owing to their almost simultaneous appearance and close apposition during development (Adelmann, 1925; Bartelmez, 1922; Holmdahl, 1934; Kolmer, 1928; Politzer, 1928; Völker, 1922; and Weigner, 1901). But as long ago as 1906 Streeter drew attention to the early independence of the VII and VIII ganglia in the human embryo and suggested that their close intimacy should be regarded as contiguity rather than fusion. While he did not investigate the source of the acoustic ganglion cells Streeter (1906) questioned the accepted view of their origin from a common primordium and later (Streeter, 1912) stated that they were not derived from the neural crest. The resolution of this problem clearly involves the examination of a close series of embryos, particularly at stages earlier than that at which these ganglia appear to be fused.

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