Table 2.

Morphological data for normal facial nerve-innervated orbicularis oris and tibial nerve-innervated gastrocnemius.

Muscle	Mean fiber cross section area (CSA, μm2)	Endplate surface area (ESA, μm2)	ESA/CSA
Orbicularis oris	301.85 ± 83.19*	148.39 ± 33.28*	0.53 ± 0.21*
Gastrocnemius	628.79 ± 47.15	251.82 ± 26.34	0.40 ± 0.06

The size of the ESA was measured by analyzing the circumference of the total endplate region from transverse sections. The size of the mean fiber CSA was measured from longitudinal sections in the same way. Values are means ± standard deviation. Significant differences detected by the paired t-test. ^*P < 0.05 vs. gastrocnemius.