293643.fig.004a
(a)
293643.fig.004b
(b)
Figure 4: (a) Photomicrograph from the microscopic location of the fibrous white sheet in between the pectinate muscles (PE), in the right atrium (RA) in the male ostrich heart. Green Masson’s Trichrome: CT—connective tissue mass, CO—columns of Purkinje cells. (b) Photomicrograph from the microscopic location of the fibrous white sheet (WP) and related clauses (arrow) in right atrium the male ostrich heart: RA—right atrium bottom, PE—shoulder muscles.