Abstract

This study presents results about features of the structure of the atrial myocardium and scallop muscles of the Anglo-Nubian goat (Capra aegagrus hircus), and their morphometric parameters have been determined. Sixteen corpses of Anglo-Nubian goats at the age of twelve months were studied in the Department of Animal Anatomy of the St. Petersburg State University of Veterinary Medicine. The study was carried out by making histological preparations. The atrial myocardium of Anglo-Nubian goats consists of working cardiomyocytes, tightly adjacent to each other, between which capillary blood vessels and single adipocytes are revealed. It has been determined that atrial cardiomyocytes in Anglo-Nubian goats are characterized by heterogeneity of their structure, and secretory granules and perinuclear clearances are found in cardiomyocytes less differentiated in terms of contractile activity. In the present study, the histological structure of the atrial scallop muscles of the Anglo-Nubian goat was identified. Also, the atrial myocardium's working cardiomyocytes' morphometric parameters and its scallop muscles had discovered. The thickness of the endocardium in these sections was measured by determining the diameters of its nuclei. The obtained data indicate that the histological structure of the atrial myocardium and its scallop muscles in Anglo-Nubian goats has possibly similar features in compared with small ruminants from commercial breeds (sheep and goat). These results expand the field of knowledge on pedigree anatomy and histology of the heart in farm animals, particularly in small ruminants. © 2021. All Rights Reserved.