Table 4.

CF bouton morphological properties for individual boutons

Bouton level	Primary N = 2040 (EP) N = 0 (Term)	Nonprimary N = 11,154 (EP) N = 5033 (Term)
Bouton/interbouton diameter ratio	1.5 ± 0.56	2.0 ± 0.72
En passant surface area (μm2)	14 ± 9.3	6.8 ± 4.9
Terminal surface area (μm2)	n/a	5.5 ± 4.1
En passant length (μm)	3.2 ± 1.6	2.4 ± 1.2
Terminal length (μm)	n/a	1.9 ± 1.0
En passant diameter (μm)	0.94 ± 0.36	0.64 ± 0.24
Terminal diameter (μm)	n/a	0.68 ± 0.28
En passant length/diameter ratio	4.4 ± 2.0	4.7 ± 2.2
Terminal length/diameter ratio	n/a	3.8 ± 2.4