CbN neurons produce putative collaterals targeting the “eyelid conditioning microzone” region of the cerebellar cortex, located at the apex of the primary fissure joining the Simple and 4/5 lobules (n=4 mice). A. An atlas section illustrates site of injection into eyelid conditioning zone of cerebellar cortex. B. BDA label in interposed nucleus somata was seen following injection into eyelid conditioning microzone. C. Terminal boutons in red nucleus (RN) were labeled with BDA following microzone injections; D. Terminal boutons in ventrolateral thalamus (VL) were labeled with BDA following microzone injections. Scales, B = 20 μm; C,D = 10 μm. Convention: Arrows, axons; Arrowheads, terminals; Asterisks, somata; Crosses, injection sites.