of journal "Morphologia", E. office 2019. Junqueira’s Basic Histology : Text & Atlas (15th ed.), 2018. Морфологія / Morphologia / Morfologìâ. 13, 2 (Jun. 2019), 101–104. DOI:https://doi.org/10.26641/1997-9665.2019.3.101-104.