Biliary tree model
FIG. 1 is a front perspective view of a biliary tree model, showing my new design; 
     FIG. 2 is a top plan view thereof; 
     FIG. 3 is a rear elevational view thereof; 
     FIG. 4 is a bottom plan view thereof; 
     FIG. 5 is an elevational view thereof from the left side of FIG. 1; and 
     FIG. 6 is an elevational view thereof from the right side of FIG. 1.