descending

adjective

de·​scend·​ing ˈdē-ˌsen-diŋ  di-ˈ 

1

: moving or directed downward

descending infection from the kidney

—Therapeutic Notes

2

: being a nerve, nerve fiber, or nerve tract that carries nerve impulses in a direction away from the central nervous system : efferent, motor

the descending branch of a nerve