Valve of Rosenmuller is located at
A fold of mucous membrane found at the junction between the common canaliculus and the lacrimal sac. It is not strictly a valve because fluids can be blown back to emerge at the puncta. It is not always fully developed. ref -medscape.com
Cystic duct
Opening of nasolacrimal duct
Junction of lacrimal sac and canaliculus
Ampulla of vater
Head and neck