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The study was performed on 82 small saphenous veins in human fetuses of both sexes aged 9 to 37 weeks. The earliest valves were observed in 13 week-old fetuses. In fetuses between 13 and 18 weeks old the number of valves increased from 1 to 8. In the older fetuses between 19 and 37 weeks the number of valves varied from 5 to 9 and does not seem to be related to age. During development more valves were found in the upper part of the small saphenous vein. The height of valves increases with age and differs between particular valves of the same vein.
The purpose of the present review was to provide an up-to-date summary of the bio ecological theory in sport literature. Systematic reviews can facilitate decision-making in areas where randomized control trials (RCTs) have not been performed or are inappropriate. In order to appreciate the status of current knowledge and understanding and to identify potential future directions, the authors conducted a synthesis of published work in sports science using a systematic-review methodology. Published since 1977, Bronfenbrenner’s model of human development provided an ecological lens for identifying and synthesizing barriers to sport participation. From a search of electronic databases, findings comprised 1120 identified records, from which only 896 entries were considered. From these a total of 183 published studies relating to the bioecological theory and sports science were assessed, and from this point only articles pertaining to sport related issues were taken into consideration (n = 89) excluding other types of documents (n = 94). The Systematic Review (SR)develops upon these 89 articles and a total of 23 articles were selected for the fourth and final retrieval. A semi quantitative review protocol and standard quality assessment criteriahave dominated the research. The authors conclude by summarizing the key findings in the literature and highlighting the gaps that could be filled by future research.
Background: Functioning in a peer group plays an important role in child development. Building self-esteem of children depends on many factors such as physical health, self-evaluation of their physical performance, academic achievement, social support, family relationships, as well as relationships with peers and teachers. Importance of contacts with peers increases during school-age. At this time children are not able to reject the opinion of other people and subject their behaviour completely to the expectations of their peers. When the need for emotional contact is not satisfied, the complex of being different appears. Isolation within group causes a sense of inferiority, the child becomes passive and resigned. Children, who are chronically ill, rejected or isolated often follow negative emotions in their actions, they become aggressive towards other children or do not want to continue learning. Often the decision about an individual teaching plan results in further isolation of the child. The child’s position in the peer group affects the developing personality, self-confidence and self-esteem. Aim of the study: The aim of the study was to determine the interpersonal relationships of young school-aged children with type 1 diabetes in their peer groups. Material and methods: The study was conducted on children with type 1 diabetes and their parents, who are supervised by Clinic of Diabetes, Regional Medical Center in Opole. The research tool used in both groups was a questionnaire consisting of open and closed questions elaborated by the authors of this study. Results: 73% (41) of evaluated children declared that diabetes does not hinder their performance at school. 93% (55) children claimed that they do not hide their condition from their peers. In addition, 61% (34) talk about their illness with their peers and 69% (38) of them can count on their peers’ help in self-control of diabetes. 71.9% (46) of parents of children with type 1 diabetes allow their children to participate in school trips and 68.8% (44) to participate in school competitions. Conclusions: In most children, diabetes does not affect children’s performance at school. They participate in classes, are accepted and liked in their peer group. Chronically ill children should be able to participate in all types of activities as much as their healthy peers. It seems necessary to continue studies on performance of young school-aged children with type 1 diabetes in their peer group.
There is no agreement in the literature as to the time of the onset and progress of the vertebral column ossification. The aim of the present study was to determine the precise sequence of ossification of the neural arches and vertebral centra. Histological and radiographic studies were performed on 27 human foetuses aged from 9 to 21 weeks. It was found that the ossification of vertebrae commences in foetuses aged 10 and 11 weeks. Ossification centres appear first for neural arches in the cervical and upper thoracic vertebrae and by the end of 11th week they are present in all thoracic and lumbar neural arches. In the vertebral centra in foetus of 10 weeks ossification was found in the lower 7 thoracic and first lumbar vertebrae. By the end of 11th week ossification is present in the lower 4 cervical, all thoracic, all lumbar and 4 sacral vertebral centra. The study indicates that ossification of the neural arches proceeds in the craniocaudal direction, whereas in the vertebral centra it progresses from the lower thoracic vertebrae into both directions. Different shapes of ossification centres were also described. (Folia Morphol 2013; 72, 3: 230–238)
The study was performed on 110 great saphenous veins in human foetuses of both sexes aged 9 to 37 weeks. The earliest well-shaped valves were observed in foetuses aged 13 weeks. In these foetuses the number of valves varies from 2 to 7. Consecutive microscopic sections revealed that the developing valves at their origin present thickening of the endothelium which is continuous into the cusps of the valves. The bicuspid cusps are crescent-shaped and both surfaces are lined by endothelium.
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