A morphological study on sinus and atrioventricular nodes in saanen goats*

In mammals, the sinus node and atrioventricular are defined as heart's specific stimulus conduction systems. The electrical stimulation that starts in continues with node, rhythmic occurs this way. There differences nodes' location, size, cell structures between species. study, which was carried out to determine morphological locations of nodes Saanen goat hearts, nine hearts from healthy goats were used. After performing routine tissue follow-up procedure for histological examinations, 5 μm-thick serial sections taken paraffin-blocked samples stained Crossman Trichrome Periodic Acid Schiff (PAS) photographed. It determined a subepicardial position near where cranial vena cava opens up right atrium. an average length 8-10 mm crescent-shaped. located subendocardium layer half interatrial interventricular septum, coronary opened into An 4.5-5 observed be roughly oval. Two types cells identified both nodes: small, rounded empty cytoplasm rather large nuclei, thin, elongated darker staining.