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. 2015 Feb 13;7:4. doi: 10.3389/fnagi.2015.00004

Figure 8.

Figure 8

Comparison of age related neuron loss in three cholinergic efferent systems. There is considerable loss in the olivocochlear efferent system (left) of 26% (t = 4,984; df = 18; p < 0.0001), whereas the vestibular efferent system (middle) is not affected by age and the trigeminal motor system (right) shows only a moderate neuronal loss of 12% (t = 2.155; df = 18; n.s.). Neuron numbers are given as mean ± SEM. Dark gray columns: young adult animals, light gray columns: aged animals. **** p < 0.0001.