{HEAD ~ The peripheral walls} of the funnel meet {TAIL ~ the vessel walls} at an oblique angle and channel fluid and debris flowing proximally into the funnel to efflux ports at the base of the funnel 
{ HEAD ~ The peripheral walls } of the funnel meet { TAIL ~ the vessel walls } at an oblique angle and channel fluid and debris flowing proximally into the funnel to efflux ports at the base of the funnel
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH