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