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