SEM, TEM, and IHC Analysis of the Sinus Node and Its Implications for the Cardiac Conduction System
Figure 7
SN inner structure. In the center, helicoidal connective structures can be seen in sections parallel to the SN artery, regularly twisted whereas, in the transverse sections, they appear as vortices (on the left, note the inner centered capillary (*) and on the right, note SEM ×925, ×1360, and ×1770).
