Teeth may have one or more roots. In those teeth with two or more
roots the point where they diverge is called the furcation angle.
This can be a bifurcation or a trifurcation.
At the end of the root is the apex, which can have a single foramen
(humans), a multiple canal delta arrangement (cats and dogs) or
remain open as in herbivores. In some herbivores the apex closes
eventually (horse) whereas in others it remains open throughout
life. The apical area is where nerves, blood vessels and lymphatics
travel into the pulp.