Morfologii͡a (Saint Petersburg, Russia)
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Electron microscopic investigation of gap junctions (GJ) on serial sections of rat barrel cortex has shown that GJ were in contact with one or both processes that formed chemical synapses, however, these connections could not traced in single sections. In the serial sections, it was possible to observe two GJ in the immediate proximity to one another, in a single field of vision, thus, each GJ was traced in two or three successive sections in a series. Considering the described variants of GJ arrangement in the cortex, it is suggested that GJ could be a structural basis for local synchronization of the bioelectrical activity not only at postsynaptic, but also at presynaptic level, and the formation of GJ occurs both before, and after the development of chemical synapses.
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Biography Historical Article
[The service to the truth and the Fatherland (on the decorations of Nikolai Ivanovich Pirogov)].
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Biography Historical Article
[Nikolaĭ Ivanovich Pirogov--the first clinical anatomist in Russia].
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Topographic anatomical relationship between the trigeminal nerve trunk (TNT) and superior cerebellar artery (SCA) was investigated in 25 autopsy cases (50 TNTs), in individuals who never suffered from trigeminal neuralgia (TN), by means of injecting colored polymerizing silicone mass into the vertebro-basilar system through one of the vertebral arteries. It was found that the top of SCA loop (formed as its anterior pontomesencephalic segment continues into the lateral pontomesencephalic segment) was situated between TNT and tentorium of the cerebellum, and the lateral pontomesencephalic segment did not intersect the TNT in the vertical plane. The contact between SCA pontomesencephalic segment with the superior surface of TNT in the projection of the entry zone and around it was observed in 16 cases (32%). ⋯ In 121 cases (74%), a single SCA branch was involved and in 42 cases (26%) two branches were involved. Thus, these observations have shown that the contact between SCA and TNT cannot lead to TN development, since traumatizing action on the nerve results not from the pulsation of the wall of artery which touches the nerve, but from the strokes of the distal arm of SCA loop, that unbends during each systole and is located at an angle to TNT. This is the essence of the difference between the neurovascular contact and the neurovascular conflict.