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Asymmetry in the bone weight of the mandible and limbs of rats.

Asymmetry in bone weights of the mandible (mandible with teeth and mandible without teeth), thoracic limb (scapula, humerus, radius and ulna) and pelvic limb (os coxae, femur and tibio-fibula) was studied in 54 rats consisting of male and female (weighing from 200 to 260gr.) Therefore, we compared the bone weight on the right side with that on the left in each bone, and whether the presence or absence of one-sided dominance was examined.As a result, the following findings were obtained.1) The mean weights of bones are greater on the dominant side in each instance (p<0.01 or p<0.001).2) The degree of difference in bone weights between the dominant and nondominant sides determined by the method of von VERSCHUER'S average percentile deviation is large in the thoracic limb, pelvic limb and mandible in that order. The deviation of scapula is great especially among other bones in the thoracic limb, in the pelvic limb that of os coxae is more or less greater than other bones.3) There does not exist one-sided dominance in the mandible, thoracic limb and pelvic limb.4) Every bone consisting of a limb is not necessarily heavier on the same side.