The dorsal rootlets carry sensory (afferent) fibers to the spinal cord, and ventral rootlets carry motor (efferent) fibers away from the spinal cord. ... There, the dorsal and ventral roots fuse to form the spinal nerve, which is a mixed nerve carrying both sensory and motor fibers.

What are rootlets in plants?

rootlet Strictly, a small plant root, but the term is also commonly used to describe the traces of plant roots preserved in a fossil soil or sediment. A Dictionary of Earth Sciences.

What does the root simple mean?

simple (adj.)

"plain, decent; friendly, sweet; naive, foolish, stupid," hence "wretched, miserable," from Latin simplus from PIE compound *sm-plo-, from root *sem- (1) "one; as one, together with" + *-plo- "-fold."