Summary
Two new variants of the presphenoid of the mouse are described. They are sutures in the preoptic root and reduction or absence of the postoptic root of the ala orbitalis. The former variant arises during ossification, while the latter is preformed in cartilage. Both variants occur in different frequencies in three inbred strains of mice. They are regarded as quasi-continuous variations, and their behaviour in crosses between two of the pure fines is best explained on a multifactorial basis. Additional data for interfrontal and parted froutals described previously indicate a similar genetic basis for these two variants.
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Truslove, G.M. Genetical studies on the skeleton of the mouse. J Genet 52, 589–602 (1954). https://doi.org/10.1007/BF02985082
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DOI: https://doi.org/10.1007/BF02985082