Table 2.

Morphological Synaptic Parameters During Postnatal Development

Age	P6–7	n *	N †	P8–9	n *	N†	P10–11	n *	N†	P12–13	n *	N†	>P30	n *	N†	P Value
No. of contacting cone terminals	45 ± 3.7	6	2	59.86 ± 5.6	7	3	61.88 ± 4.0	8	2	56.11 ± 3.3	9	3	50.25 ± 4.6	8	4	0.0695 (ANOVA)
Cone terminal area (µm2)	6.64 ± 0.13	149	2	7.77 ± 0.20	144	3	10.16 ± 0.24	142	2	11.27 ± 0.28	146	3	17.21 ± 0.28	147	4	<0.001 (Kruskal–Wallis)
No. of HC contacts at cone terminals	3.53 ± 0.32	51	2	5.64 ± 0.32	104	3	5.21 ± 0.26	119	2	6.81 ± 0.40	84	3	6.01 ± 0.30	100	4	<0.001 (Kruskal–Wallis)
No. of AZs	4.34 ± 0.23	38	2	5.57 ± 0.34	30	2	8.65 ± 0.49	31	2	8.13 ± 0.48	32	2	13.52 ± 0.59	33	2	<0.001 (Kruskal–Wallis)
AZ area	1.06 ± 0.08	38	2	1.81 ± 0.14	30	2	2.43 ± 0.15	31	2	2.01 ± 0.13	32	2	4.47 ± 0.21	33	2	<0.001 (ANOVA)
No. of synaptic ribbons	5.29 ± 0.30	31	4	5.55 ± 0.30	31	3	7.30 ± 0.48	30	3	7.27 ± 0.62	29	3	10.65 ± 0.47	34	4	<0.001 (Kruskal–Wallis)
Synaptic ribbon length (µm)	0.62 ± 0.02	164	4	0.64 ± 0.02	172	3	0.82 ± 0.02	218	3	0.86 ± 0.02	218	3	1.04 ± 0.02	360	4	<0.001 Kruskal–Wallis)
% Attached synaptic ribbons	23.82 ± 4.45	4	4	23.90 ± 3.93	3	3	18.72 ± 1.40	3	3	32.78 ± 4.63	3	3	78.07 ± 2.77	4	4	<0.001 (ANOVA)

^*n denotes statistical n.

^† N denotes animal n.