Morphology and development of the thoracic part of the sympathetic trunk (pars thoracica trunci sympathici) in the pig (Sus scrofa L.) during the prenatal period.
The aim of the experiment was to establish, on the basis of morphometric and statistic analysis, the changes occurring in the thoracic part of the sympathetic trunk of the pig during its prenatal period. The experiment was conducted on 36 swine fetuses divided into three age groups. The standard variation (s) and the coefficient of variation (CV%) of the length of sympathetic components were calculated. The rates of standard variation increased with the age of the fetuses and it was found that the most dynamic development of the elements examined took place during the terminal period of gestation. Also the coefficient of correlation of the length of those elements investigated with the length of the fetuses was calculated. The part of the sympathetic trunk in question was found to be negatively allometric in relation to the body length during the whole of gestation. A gradual emergence of an increasing domination of the right side of the body, in relation either to the ganglia or to the interganglionic branches was observed. There was no perceptible influence of sex on the rate of development of the part of the sympathetic trunk studied. Also an emergence of an increasing domination of the fetuses originating from the left uterine horn at the end of gestation was noted.
Pospieszny
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Katedra Anatomii Zwierzat Akademii Rolniczej we Wrocławiu, Poland.
Bruzewicz
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D000818:Animals; D005314:Embryonic and Fetal Development; D005260:Female; D005728:Ganglia, Sympathetic / Q000033:anatomy & histology / Q000196:embryology; D005865:Gestational Age; D008297:Male; D011247:Pregnancy; D013552:Swine / Q000196:embryology*; D013564:Sympathetic Nervous System / Q000033:anatomy & histology / Q000196:embryology*; D013909:Thorax