XXVI.—Situs Inversus Viscerum in a White Rat (Mus norvegicus)

Abstract

Congenital transposition of the viscera has frequently been recorded in man. Figures relating to its incidence are quoted by O'Farrell (1941) and by Kean (1942), and the possible causes of reversal of symmetry are discussed by Cockayne (1939). A case of situs inversus viscerum in the cat is described by Wragg (1939), and one case was observed in the mouse by Grüneberg (1943). So far as the writers are aware this condition has not previously been recorded in the rat.