The number of muscle fibers innervated by a motor axon is smallest in:
The extraocular and hand muscle has a ratio of 3-6 (total 3000 motor units) whereas gastrocnemius and back muscle (concern with posture) has a innervation ratio of 2000 (total 600 units).
Gastrocnemius
Orbicularis oculi
Single-unit smooth muscle
Soleus