Supratrochlear nerve

The supratrochlear nerve, smaller than the Supraorbital nerve, passes above the pulley of the Superior oblique, and gives off a descending filament, to join the infratrochlear branch of the nasociliary nerve.

It then escapes from the orbit between the pulley of the Superior oblique and the supraorbital foramen, curves up on to the forehead close to the bone, ascends beneath the Corrugator and Frontalis, and dividing into branches which pierce these muscles, it supplies the skin of the lower part of the forehead close to the middle line and sends filaments to the conjunctiva and skin of the upper eyelid.

Etymology
Supratrochlear means "above the trochlea". The term trochlea means "pulley" in Latin. Specifically, the trochlea referred to is a loop inside the orbit of the eye, through which the tendon of the superior oblique muscle passes.