Table 1.

Ultrastructural analysis of HRP-labeled vibrissa afferent boutons and their presynaptic endings (p-endings) in the cat trigeminal caudal nucleus

N indicates the number of HRP-labeled boutons and p-endings analyzed. ^*Vesicle density indicates number of vesicles per unit volume (µm³). ^†Values for the active zone area and apposed surface area indicate the data obtained from the contacts between HRP-labeled boutons and their p-endings. ^‡Indicates statistically significant differences between HRP-labeled boutons and p-endings (unpaired t-test, P<0.05).