Ultrastructure of the basilar artery has been examined in 14 animals aged 70 and 140 days. The structure is characteristic for the muscular type artery. During the most intensive physical growth of the animals between 70 and 140 days, at the time of sexual maturation, the number of laminae in the middle layer increases from 4 to 6 and collagenous, and elastic fibers increase as well.
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