Topographic and anatomical features of muscular and vascular structures in lateral cervical region during prenatal period of human ontogenesis

Background. One of topical areas of morphological research is features of topographic a relationships of the vascular, nervous, muscular, fascial and cartilaginous structures of the neck in prenatal period of human ontogenesis, as data on their formation at different stages of development will improve diagnostic methods of visualization and surgical correction of congenital and acquired pathologies of head and neck. Objective. To find out the peculiarities of synthopia of vascular and muscular structures of the lateral cervical region in human prefetuses. Methods. 9 human prenatal specimens aged 9-12 weeks of prenatal development have been studied by using a set of morphological methods, according to existing bioethical norms. Results. During 9th week of development, bony and musclar boundaries of the lateral triangle of the neck, the carotid vagina, and the components of the vascular-nervous bundle of the neck have been determined. Within the carotid triangle, the external carotid artery is located superficially; it is crossed frontally by the cervical branch of facial nerve and the sublingual nerve. The superior thyroid artery departs from the external carotid artery at the level of the cartilaginous model of the large horns of hyoid bone and passes to the rudiment of thyroid gland. Retropharyngeal space is found at 9th week of development, moderately filled with adipose tissue. The anterior vertebral plate of the cervical fascia forms the bottom for posterior triangle of neck. Conclusion. The lateral cervical region in human prefetuses is represented by a multilayered topographic zone with formed boundaries and contents. Cervical fascia forms carotid vagina within the carotid triangle, and pharyngeal space. The course of blood vessels and nerves within the lateral cervical region is variable. Three-dimensional reconstructions of prefetuses serve as evidence of the early formation of definitive topographic connections within early bony and cartilaginous models in relation to the muscles of the anterior and lateral cervical regions.

On the Issue of Eyeball Topography Development in the Intermediate Fetal Period of Human Ontogenesis

The article considers the microtopography of the eyeball during the intermediate fetal period of human ontogenesis.Objective – to identify the features of qualitative and quantitative topography characteristics development of the eyeball with the orbit and its contents in the intermediate fetal period of human ontogenesisMaterial and methods. The study was conducted on 50 fetuses of both genders (25 male, 25 female) aged from the 14th to the 27th week of gestation, which make up the collection of Human Anatomy Department of the Federal State Budget Educational Institution of Higher Education Orenburg State Medical University of the Ministry of Health of the Russian Federation. All the material was divided into three age groups: group I (14–18 weeks) contained 18 fetuses, group II (19–23 weeks) contained 19 fetuses, group III (24–27 weeks) contained 13 fetuses. The work was performed by methods of macromicroscopic preparation, by modified N. I. Pirogov's oversplitting method, and by histotopographic method.Results. At an earlier stage, the eyeball occupies a central position in the orbit. By the end of the intermediate fetal period of human ontogenesis, the eyeball shifts closer to the medial wall of the orbit. In the intermediate fetal period of human ontogenesis, the entrance to the orbit has the shape of an ellipse with a height and width equal to 15.01±3.98 mm and 13.91±3.25 mm, respectively. The thickness of the medial, lateral, upper and lower walls of the orbit in the intermediate fetal period is 0.46±0.12 mm, 1.98±0.41 mm, 0.45±0.12 mm and 2.11±0.62 mm, respectively. The predominance of length and thickness of the medial rectus muscle of eye over the lateral rectus muscle of eye was noted in all observation groups.Conclusions. The eyeball topography in the intermediate fetal period of human ontogenesis is similar to the topography in the childhood and adult periods, but it has its own fetal features: the shape of the eyeball, the position in the orbit, the relation to the auxiliary apparatus. The most complex topographic and anatomical relationships are noted at the posterior pole of the eyeball in the area of the visual canal.

Morphometric Characteristics of the Thigh Bone in Human Fetuses

Defining quantitative growth parameters of individual skeletal bones, namely the right and left femurs, is practically important for determining the age of the fetus. Lack of data on changes in the length of the femur in 4-10 months’ fetuses, as well as the dependence of its morphometric parameters on the length of the lower limb and the age of the fetus, prompted us to conduct this study. The purpose of the study was to determine the morphometric parameters of the length of the right and left femurs during the fetal period of human ontogenesis, which could form the base of normal indicators. Materials and methods. Morphometric study was performed on the lower extremities specimens of 40 human fetuses of an 81.0-375.0 mm parietal-coccygeal length. Results and discussion. As a result of the study, the dynamics of changes in the length of the right and left femurs and lower extremities in 4-10 months’ human fetuses was established. Direct correlations were found in the studied fetal groups, and only in 5-month-old fetuses a direct medium-strength reliable correlation between the lengths of the right and left femurs was found. A weak correlation between the length of the left lower limb and the length of the left femur was found in 7-month-old fetuses. In other cases, direct significant strong correlations were found between the analyzed indicators. The results obtained regarding the change in the length of the right and left femurs, as well as the Pearson correlation coefficient between the morphometric parameters of the length of the right and left femurs and the length of the lower extremities and parietal-coccygeal length of human fetuses 4-10 months are important both theoretically and practically for fetal anatomy. Conclusion. During the fetal period of human ontogenesis, where there is a relatively uniform increase in the length of the right and left femurs, no significant differences in their length were detected. Between the 4th and the 10th month of fetal development, the length of the right femur increases by 5.59 times (from 13.18 ± 2.56 mm to 73.66 ± 2.19 mm), and the length of the left femur increases by 5.44 times: from 13.54 ± 2.35 mm to 73.73 ± 2.12 mm, respectively. In the fetal period the right and left lower extremities also grow equally, no significant differences in their length have been established

THE INFLUENCE OF ADOLESCENTS ' SELF-ESTEEM ON THE MOTIVATION TO ACHIEVE SUCCESS

This article reveals the features of the development of self-esteem and achievement motivation in older adolescents. Adolescence is considered a crisis period in human ontogenesis. In modern studies, there is a steady increase in the formation of unfavorable personality traits in adolescents. At this age, problems with self-esteem of the individual are more common, since the teenager's interest in himself, his self-perception and the need to understand himself are activated by the processes of puberty and psycho-physiological changes. The danger of this tendency for the future generation lies in the fact that inadequate self-esteem can cause the development of insecurity, complexes, anxiety, aggression, and can also act as a factor in suicidal behavior of adolescents. It should be noted that for many years Kazakhstan has been among the ten countries in the world in terms of the number of suicides among adolescents and youth. In modern socio-economic conditions, it is especially important to achieve a high level of development of a teenager's personality, and the formation of such qualities as self-confidence, motivation to achieve success. Therefore, the study of the relationship between self-esteem and the motivation for achieving success of the younger generation, along with modern social and revolutionary changes, is one of the urgent problems. The article presents an analysis of the results of an empirical study, the purpose of which was to identify the relationship between self-esteem and motivation for achieving success in adolescents. To achieve the goal of the study, the following psychodiagnostic methods were used: the method of G.N.Kazantseva "Study of general self-esteem"; the method of A. A. Rean "Motivation for success and fear of failure". The results suggest that there is a close positive relationship between self-esteem and achievement motivation in adolescents

Peculiarities of morphogenesis of orbit and organ of vision structures in human fetuses

The aim of this work is to elucidate the features of morphogenesis, syntopic and morphometric changes in the structures of the orbit, neurovascular and muscular structures of the organ of vision in the fetal period of human ontogenesis.Material and methods. By means of complex of methods of morphological research (anthropometry, morphometry, microscopy, preparation, three-dimensional computer reconstruction and statistical analysis), 30 specimens of human fetuses of both sexes aged from 4 to 10 months of intrauterine development (IUD) (160.0-460.0 mm parietal-coccygeal length (PCL)) were studied. Computer tomography was used to study 17 human fetuses aged from 4 to 9 months of IUD (180.0-440.0 mm PCL).Results. At the end of the 5th month of IUD, an orbital index is 75%, which is noted in the transformation of the shape of orbit from flattened to rounded due to an increase in its vertical size relative to the horizontal one. We associate this transformation of the orbit with syntopic influence of adjacent regions: the growth of the lateral wall of the nasal cavity, development of the paranasal sinuses, and facial skeleton. At the end of the 5th week of intrauterine development, external eyeball muscles are finally differentiated from the common muscle rudiment. The analysis of changes in morphometric parameters of muscles of the eyeball made it possible to derive mathematical functions, that describe normal dynamics of growth of their length, as well as to reveal critical periods of their development in terms of the rate of changes in their thickness and width.Conclusions1. The development of the organ of vision in the fetal period of human ontogenesis is a complex process due to the coordinated interaction between morphological and morphometric changes in the orbit, eyeball and its muscles, nerves and vessels.2. Critical periods of development of the orbit and its structures is the 6th month of intrauterine development, during which there is an uneven growth rate of the size of the muscles of the eyeball, as well as the size of the orbit.3. At the 6th month of intrauterine development, uneven growth rates of the horizontal size of the orbit relative to the vertical one are observed, as a result of which its shape begins to return to the mesoconchal type characteristic of such prefetuses. Such age-related transformations of shape and size of the orbit are due to the growth of the eyeball, skull and face, which generally determines the shape of the orbit.4. Starting from the 8th month of fetal period of development, structure and topography of the structures of the orbit acquire signs of a definitive condition, the shape of the orbit is finally established, and uniform growth rates of all structures of the organ of vision are observed, except for the growth of the circumference of the orbit at the end of prenatal period of human ontogenesis.

Anatomy of the Human Cervical Spine and Spinal Cord at 20–22 Weeks of Intrauterine Development

Early and timely diagnosis of the spinal column and spinal cord pathologies, their intrauterine and postnatal correction require detailed knowledge of the anatomy and topography of the cervical spine in the fetus. The complex interactions of the cervical spine with the corresponding parts of the spinal cord and adjacent structures require detailed study during the embryonic period of ontogenesis.The aim of the study was to investigate the morphometric and topographic anatomical fetal features of the cervical spine and adjacent structures at 20–22 weeks of the intrauterine development.Material and methods. This study was performed on the sectional material from human fetuses, 20–22 weeks of development (20 human fetuses of both sexes), obtained from the fetal collection of the Department of Human Anatomy, Orenburg State Medical University. A standard set of morphological methods were applied in the study – macromicroscopic preparation, Pirogov method of cuts in three mutually perpendicular planes, production of serial histotopograms with Van Gieson staining, photography, morphometry.Results. It was found that during the studied periods of prenatal ontogenesis, the length of the cervical spine averaged 17.5±1.5 mm. The transverse size of the vertebral body in fetuses of 20–22 weeks of development throughout the cervical spine is of greater importance than the anteroposterior. The transverse and anteroposterior dimensions of the vertebral foramen gradually decrease in the craniocaudal direction. It was also demonstrated that it is necessary to remove the dura mater in order to obtain reliable dimensional characteristics of the spinal cord.Conclusion. Thus, the data obtained on the anatomy and topography of the spinal column and the spinal cord at the 20th – 22nd weeks of the human ontogenesis can serve as the morphological basis of fetal surgery.

CHARACTERISTICS OF HUMAN MOTOR ACTIVITY DURING SLEEP IN YOUNG ADULTS (18–21 YEARS) USING INFORMATIONANALYTICALSYSTEM

The study of human motor activity during sleep in the period of adolescence/early adulthood was carried out. The study involved 35 healthy people — 18 women (51.5%) and 17 men (49.5%) aged 18 to 21 years. The data was obtained and processed with the employment of an original information-analytical system developed by the authors. When analyzing the data, we identified and used the following parameters: the number of movements, the maximum value of jerk and the coefficient of motor activity. For the number of movements, the average value was 9.6 and 10.2 for men and women, respectively. For the maximum value of jerk, the average value was 26.4 g/s and 24.3 g/s for men and women, respectively. For the coefficient of physical activity, the average value was 10.3% and 12.7% for men and for women, respectively. Thus, the results of the study are fundamental for understanding the adolescent period of postnatal human ontogenesis, indicate sexual dimorphism, and can also be used in research and practice in the field of physiology, neurology, neurosurgery, psychiatry and functional diagnostics with account of the specific age interval, as well as for prognosis.