[Asymmetry in the structure of the middle part of the facial skull].

The results of study of the middle third of the facial region, performed on a total of 412 skulls of male individuals, lead to the following conclusions: 1. In the investigated upper section, the zygomatic bone inclusive, downwards to its lower section along the alveolar process of the maxillary bone, a complete and approximative symmetry displayed by the width values is more frequently met with, whilst asymmetry is rather rarely. In the same direction, from above downwards, the number of skulls with differences in favour of the right side decrease, whereas the number in favour of the left side increase, with the rarely observed asymmetry in the lowermost section usually involving the leftside. 2. The height of the upper jaw-bone region near the sagittal line shows more frequently symmetry (complete and approximative), and rather rarely asymmetry, whilst insofar as the zygomatic bone is concerned the opposite is observed; therefore, in the direction from medial to lateral-wards the incidence of asymmetry increases, whereas that of the symmetry decreases. In the same direction the number of skulls with differences in favour of the right side increases, while the number in favour of the left side decreases. 3. The coincidence of absolute differences recorded in 69%, respectively 61.6%, between right and left side of closely positioned dimensions (20 and 31, resp. 20 and 42) proves that the data about these dimensions are apt to determine symmetry and asymmetry manifestations with a sufficient reliability. 4. The individual values of the pairs of breadth dimensions of one and the same region of the studies craniofacial portion show a higher degree of correlation than those of different regions which is due to the differences between the latter in terms of incidence of symmetry and asymmetry in their build up. 5. The width of the middle third of the median craniofacial portion and the lateral distance of the skull Zygomaxillare--Porion do not correlate, i.e. there is no parallelism between the fluctuations of their individual values. 6. In most of the cases the bones of the external nose are symmetrical, and hence its asymmetry is attributed to the soft parts as cartilage and skin.