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Laboratory 20. Heart
Step 13. Chamber of Right Atrium

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Examine the inner surfaces of the anterior and posterior walls of the right atrium [cross-section]. The posterior wall which extends from the superior vena cava to the inferior vena cava is smooth. This area is called the sinus venarum [cross-section].

The anterior wall of the right atrium is covered with a series of parallel ridges of cardiac muscle, called pectinate muscles [probe] [cross-section ]. These muscles end on a prominent ridge called the cristae terminalis [probe] close up [cross-section ] which is located between the pectinate muscles and the sinus venarum.

Links and References:
Grant's: 1.63
Netter: 208
Rohen/Yokochi: 240