Developmental relations between the weight of internal organs and somatic features of fetuses and newborns.

The paper contains results of investigations on statistical developmental interrelations between the weight of brain, heart, lungs, liver, spleen, kidneys, adrenal glands and thymus, and the total length, the crown-rump length and the body weight, and the circumference of head, shoulders, chest and abdomen of fetuses and newborns in the age from 17 to 43 weeks of life. The character and the force of the relations between the degree of the development of the weight of organs and the body dimensions was investigated by statistical methods on three levels. On the basis of the value of linear correlation coefficients, statistical relations were determined between the weight of the particular organs and the particular sometic features. The dependence between the particular organs and the complex of somatic features was determined on the basis on the multiple regression analysis. On the other hand the relation between two complexes of features, i.e. all organs and all somatic features was investigated with the help of canonical correlation coefficients. The analysis of results indicated that between the weight of internal organs and the somatic features in the fetal period there exists a statistical developmental relation. The developmental relations are most strongly marked between the 6th and the 10th months of intrauterine life, while in the 5th month of life and in postmature fetuses and newborns they are weaker.