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|Description= '''A.''' The sinus node (dotted shape) is superimposed onto the terminal groove in this picture of the right atrium viewed from the right side. The arrows indicate the sectioning plane of the histological section shown in B. | |||
<br>'''B.''' This section from an infant heart is stained in Masson’s trichrome stain that colours myocardium red and fibrous tissue blue. The sinus node is readily identifiable by its composition of small myocytes in a fibrous matrix. | |||
|Source= provided by S. Yen Ho, PhD FRCPath FESC FHEA, Royal Brompton Hospital, UK | |||
|Date= 2012 | |||
|Author= S. Yen Ho, PhD FRCPath FESC FHEA, Royal Brompton Hospital, UK | |||
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