If one likens a spinal nerve to the trunk of a tree, then the two roots of this tree are the dorsal and ventral roots. what would represent the two large branches of this tree

Ventral and dorsal rami

Explanation:

The dorsal ramus is the posterior division of a spinal nerve.  Is the dorsal branck of spinal nerve that forms from the dorsal root of the nerve after it emerges from the spinal cord.  The spinal nerve is formed from the dorsal and ventral rami

protist eukaryotes that are not plants, animals, or fungi ("misfits")