[Structural changes in the stomach muscular coat as basis for heterochronia in human early postnatal ontogenesis].
The structure of muscular tunic of human stomach since birth up to the age of 3 months in cadavers of 15 infants was studied using light microscopy. Wideness of groups of smooth myocytes and of stromal gaps between them was measured in cardial and pyloric regions. Stomach regions were compared according to the results of measuring using parametric statistics. Periods of rapid (0-2 months) and slow (2-3 months) structural changes of muscular tunic were found out. It was exposed that decrease of wideness of the groups of myocytes and of the stromal gaps accompanied increase of transverse size of the organ. Outstripping development of nonstriated musculature determined rapid growth of stomach region, outstripping changes of stroma determined delayed growth of the region.
Vilkova
I V
IV
Department of Operative Surgery and Topographic Anatomy, State Medical Academy of the Urals, Catherinburg.
D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D009024:Morphogenesis; D024510:Muscle Development; D009130:Muscle, Smooth / Q000254:growth & development*; D013270:Stomach / Q000254:growth & development*; D013997:Time Factors