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