Arrows indicate motor neurons within the spinal anterior horn.
From the nature.com
The gears are not engaged and so the car is not moving, only the motor keeps whirring and may be you can hoot the horn.
From the economist.com
These lower motor neurons, unlike those of the DL, are located in the ventral horn all the way throughout the spinal cord.
From the en.wikipedia.org
Within several weeks, the cells migrated to the ventral horn, a region of the spinal cord containing the bodies of motor nerve cells.
From the sciencedaily.com
The driver of a motor vehicle shall when reasonably necessary to ensure safe operation give audible warning with his horn but shall not otherwise use such horn when upon a highway.