The article examines in detail the main areas and methodological features of a comprehensive analysis of movement and use of fixed capital of machine building enterprises. The fixed capital of enterprises is particularly important in the process of economic activity and it requires considerable investment for development and improvement. The purpose of this study is to develop a comprehensive approach to the quantitative assessment of change in the fixed assets of enterprises, their structure, and efficiency of use.

The aim of the study was to describe morphometric characteristics of the posterior parts of the nasal cavity in different periods of childhood and to specify the age-related norm for improving surgical treatment options of choanal atresia and providing an optimal access to the anterior part of the skull base. Material and methods. The study included 87 children aged 1-21 who were exposed to craniometry of the nasal cavity structures. Results. The age-related variability of the linear dimensions and shape of the choanae, their relationship with the dimensions of the pyriform aperture and the height of the nasal cavity in the posterior part were defined in the study. The increase in the height of the choanae and the height of the nasal cavity at the back starts from 2– 3 years of age, and the width – from 8–12 years of age. The height and width of the pyriform aperture are equal to the age of 8–12; these parameters increase in older children's groups with a predominance of the height over the width. The height of the nasal cavity at the back increases in all age periods. The growth of the studied structures of the nasal cavity is completed by adolescence. In infancy, the height of the choanae is less than the height of the nasal cavity at the back by 45%, and less than the height of the pyriform aperture by 20%; in adolescence, these ratios are 42% and 23%, respectively. In infancy the choanal width is less than the width of the pyriform aperture by 49%, and in adolescence – by 40%. In infancy and early childhood, the choanae are typically small in height and width. Their shape is round in 25% of cases, however, ovoid shape is also found. The height and width of the pyriform-shaped aperture at these age periods are similar and do not exceed 17–18 mm; the height of the nasal cavity at the back is 25–27 mm. Conclusion. The authors have described age-related morphometric features of the posterior structures of the nasal cavity. These features should be taken into account by otorhinolaryngologists and neurosurgeons when planning endoscopic intranasal surgical access in children. The younger the child is, the more difficult it is to perform a surgery due to the significant restriction of the access resulted from the small size of the piriform opening and the nasal cavity, and the obstinacy of the nasal septum. When performing choanotomy for atresia, it is necessary to form the choana comparing it in shape and size with the age-related norm

The morphotopometric variability of the ethmoidal labyrinth and the parameters of the nasal cavity for 87 childrens cranium (121 years) has been determined. The growth of the ethmoidal labyrinth and the nasal cavity occurs undulating and unevenly. The increase of the height of the ethmoidal labyrinth begins earlier than its width and length from 23 years to 1316 years old. Growth periods the height of ethmoidal labyrinth occur for 23 years, 812 and 1316 years; widths 47, 812 and 1721 years; length 47, 812 and 1316 years. At the ethmoidotomy in the infant and early childhood, the smallest size of the ethmoidal labyrinth should be taken into account: width 78 mm, height 1416 mm, length 2729 mm, so in these age periods there is a high risk of damage of the cribriform and orbital plates ethmoid bone with the development of iatrogenic complications. The nasal cavity штchildren expands posteriorly as well as in adults. In the infancy, the width of the nasal cavity at the back corresponds to the width in the front section, from 2 years prevails than in front and by adolescence becomes larger for 33,5 mm. Knowing these agerelated features of the structure of the childrens nasal cavity, during surgery the rhinosurgeon when shifting the middle nasal shells medially or laterally should ensure to maintain the physiological model of the nasal cavity. In infancy, the width of the ethmoidal labyrinth is larger than the width of the nasal cavity by 38,5%, and by adolescence this ratio increases to 76,8%. The length of the nasal cavity increases from 47 years to adolescence, the length of the ethmoidal labyrinth grows parallel to the maximum length of the nasal cavity and it is less for more than a half in all childrens age groups: in the infancy by 74%, in adolescence by 85.1%. The height of the nasal cavity is twice the height of the labyrinth in any childhood age, the distance from the bottom of the nasal cavity to the lower edge of the middle nasal shell must be correlated with the distance above the level of the average nasal shell during intranasal surgeries and do not exceed it for the introduction of tools.

The use of video-endoscopic equipment in pediatric rhino-surgery necessitates a thorough study of the structure of the nasal cavity structures at different age periods. The aim of the study was to study the width of the nasal meatuses in childhood based on craniometrics data. Craniometry of 65 children's skulls was performed, divided into six groups (infancy, early childhood, first and second childhood, adolescence and youth). It was found that the width of the nasal meatuses increases unevenly with the age of the child; periods of the permanency are replaced by periods of growth. The maximum values of the width of the lower and middle nasal meatuses of the skull reach in adolescence, and the general meatuses - in adolescence. Also, an increase in the width of the middle and common nasal meatuses was revealed along their length from the anterior to posterior edges of the nasal conches by an average of 30%, while the width of the lower nasal meatuses remains constant. The ratios of the width of the lower and middle nasal meatuses to the width of the common nasal passages were determined depending on age. The width of the inferior nasal meatus to the width of the common nasal meatus at 1-1.5 years is 1: 2 at the level of the anterior end of the inferior nasal conchae and 1: 3 at the level of its posterior end, in other age groups it is 1: 1.5 and 1: 2 respectively. The width of the middle nasal meatus to the width of the common nasal meatus at the level of both ends of the middle meatus in each age group is 1: 1. The obtained data are of clinical importance for the choice of trans-nasal surgical access, for the choice of the size of endoscopic instruments, the diameter and angle of view of endoscopes, the preservation of age-related physiological relationships of the structures of the nasal cavity, and the reduction of the risk of intraoperative complications. Up to 4 years old, it is recommended to use endoscopes and endoscopic instruments of the smallest diameter; over 4 years old, the size of the nasal passages makes it possible to increase the diameter of the endoscopic set to improve access.

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