Eustachian valve is seen in -
Eustachian tube opening at nasopharyngeal end
Eustachian tube opening in tympanic cavity
IVC opening in right atrium
Coronary sinus opening in right atrium
Ans. is 'c' i.e., IVC opening in right atrium o Opening of IVC in right atrium is guarded by - Eustachian valve (rudimentary valve). o Opening of coronary sinus in right atrium is guarded by - Semilunar valve/Thebesian valve (functional valve)
Pericardium & Heart