Assertion: mediastinum's part | /r/HasAspect | internal muscular ridges
Facets:
Source sentences:
text: The internal wall of the right atrium consists of: (1) a smooth posterior part, called the sinus venarum (sinus of the venae cavae), which receives the venae cavae and coronary sinus, and (2) a rough anterior part, which has internal muscular ridges ( musculi pectinati) that resembles the teeth of a comb (L. pectin).