Question: The historical period when anatomical studies of nerves greatly increased started in what area of the continent where the mouth of the Tikhaya Sosna is located?

<P0-S0> It flows in a northeasterly direction, and joins the Don some west of the town of Liski in Voronezh Oblast. <P0-S1> The river has its sources in the eastern part of Belgorod Oblast, on the southeastern slopes of the Central Russian Upland. <SEP> <P1-S0> the ordovician period started at a major extinction event called the cambrian-ordovician extinction events some time about 485.4 ± 1.9 ma. <P1-S1> during the ordovician the southern continents were collected into a single continent called gondwana. <P1-S2> gondwana started the period in the equatorial latitudes and, as the period progressed, drifted toward the south pole. <P1-S3> early in the ordovician the continents laurentia, siberia and baltica were still independent continents (since the break-up of the supercontinent pannotia earlier), but baltica began to move toward laurentia later in the period, causing the iapetus ocean to shrink between them. <P1-S4> also, avalonia broke free from gondwana and began to head north toward laurentia. <P1-S5> the rheic ocean was formed as a result of this. <P1-S6> by the end of the period, gondwana had neared or approached the pole and was largely glaciated. <SEP> <P2-S0> The Roman physician Galen also argued for the importance of the brain, and theorized in some depth about how it might work. <P2-S1> Galen's ideas were widely known during the Middle Ages, but not much further progress came until the Renaissance, when detailed anatomical study resumed, combined with the theoretical speculations of René Descartes and those who followed him. <P2-S2> Galen traced out the anatomical relationships among brain, nerves, and muscles, demonstrating that all muscles in the body are connected to the brain through a branching network of nerves. <P2-S3> He postulated that nerves activate muscles mechanically by carrying a mysterious substance he called pneumata psychikon, usually translated as "animal spirits". <P2-S4> Descartes, like Galen, thought of the nervous system in hydraulic terms. <P2-S5> He believed that the highest cognitive functions are carried out by a non-physical res cogitans, but that the majority of behaviors of humans, and all behaviors of animals, could be explained mechanistically. <SEP> <P3-S0> It grew in fragments, with the very first traces found seemingly in Italy, coming to cover much of Europe, for some scholars marking the beginning of the modern age. <P3-S1> The Renaissance (UK: / rɪˈneɪsəns /, US: / rɛnəˈsɑːns /) is a period in European history, covering the span between the 14th and 17th centuries. <P3-S2> It is an extension of the Middle Ages, and is bridged by the Age of Enlightenment to modern history. <SEP> <P4-S0> the european migrant crisis, or the european refugee crisis, is a term given to a period beginning in 2015 when rising numbers of people arrived in the european union (eu), travelling across the mediterranean sea or overland through southeast europe. <P4-S1> it is part of a pattern of increased immigration to europe from other continents which began in the late 20th century and which has encountered resistance in many european countries. <SEP> <P5-S0> The Huns were victorious. <P5-S1> The Battle of the Tanais River in 373 AD between the Huns and the Alans, was fought on the traditional border between Asia and Europe.