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. Author manuscript; available in PMC: 2024 Oct 11.
Published in final edited form as: J Comp Neurol. 1997 Dec 22;389(3):419–443. doi: 10.1002/(sici)1096-9861(19971222)389:3<419::aid-cne5>3.0.co;2-3

TABLE 5.

Synaptic Structures per Type II Hair Cell, Chinchilla Crista1

Zone Samples Hair cells Ribbon synapses Afferent boutons Efferent boutons Outer-face ribbon synapses Ribbon synapses per afferent bouton
Central 10 58 15 ± 1 9 ± 1 3.5 ± 0.4 2.5 ± 0.5 1.8 ± 0.4
Intermediate 10 30 22 ± 2 22 ± 3 4.2 ± 0.4 1.5 ± 0.6 1.0 ± 0.1
Peripheral 8 30 17 ± 2 22 ± 2 2.5 ± 0.4 0.1 ± 0.1 0.8 ± 0.1
All 28 118 18 ± 1 17 ± 2 3.5 ± 0.3 1.5 ± 0.3 1.2 ± 0.2
1

Samples, number of 31-section dissectors. Hair cells, equivalent number of type II hair cells in the samples. All other values, mean ± SE, number of structures per type II hair cell. The last column was obtained by taking a ratio in each sample between the number of ribbon synapses not making outer-face synapses and the number of afferent boutons. Results of an ANOVA with categorical variables as in Table 1. Zone effects: Ribbon synapses: overall (P < 0.01); C vs. I (P < 0.005); I vs. P (P < 0.02). Afferent boutons: overall (P < 0.001); C vs. I (P < 0.001); C vs. P (P < 0.005). Efferent boutons: overall (P < 0.05); I vs. P (P < 0.02). Outer-face ribbon synapses: overall (P < 0.002); C vs. P (P < 0.001); I vs. P (P < 0.02). Ribbon synapses per afferent bouton: overall (P < 0.05); C vs. I and C vs. P (P < 0.05). Axis effects: Efferent boutons: CL > CT (P < 0.02). Outer-face ribbon synapses: CL > CT (P < 0.10); IP > IB (P < 0.001).