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The Development of the Adrenals and Sympathetic Paraganglia in certain Madagascar Insectivores

Department of Embryology, Carnegie Institution of Washington, Baltimore

¹ Author's address: Department of Anatomy, University of Otago, Dunedin, New Zealand.

Received for publication 31 March 1958.

SUMMARY

The development of the adrenal gland in the insectivores has not been extensively studied, Aichel (1900) and Soulié (1903) having described it in the mole (Talpa) and Celestino da Costa (1920, 1926) in the hedgehog (Erinaceus europaeus). Both Soulié and Celestino da Costa agree that in these animals the adrenal develops basically much as in other mammals, i.e. the cortical primordium comes from the coelomic epithelium, and is later invaded by migrating elements (phaeochromoblasts) from the adjacent sympathetic anlage (Aichel, however, regards the two as having a common origin, from remains of nephrostomal canals of the upper part of the mesonephros).

Nevertheless, there are some notable differences in time relations, at least in the hedgehog, for the invasion of the cortical primordium by medullary elements occurs unusually early (8 mm.): ‘La pénétration débute assez précocement à une époque où il est encore douteux qu'il existe deux espèces cellulaires dans l'ébauche proto-sympathique’ (Celestino da Costa, 1926, p. 157) (it appears to be later—about 20 mm.—in Talpa, according to Soulié, 1903, p. 515).

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