How control and coordination is facilitated in our body by electrical -chemical means?
Answers
Explanation:
Control over movement is exerted by all parts of the nervous system, not just those identified as "motor" in textbooks. The participation of alpha-motoneurons in motor control is obvious; without them there can be no movement! Considering our knowledge of reflex pathways, the role of the primary afferent neurons, certain interneurons, and the gamma-motoneurons seem fairly evident. Most of the nerve fibers that innervate a muscle are there to sense and control the length and tension of the muscle, not to make it contract. This is clearly seen in Table 16-1. In the cat soleus muscle, there are about 50 group Ia fibers, 50 group II fibers, 40 group Ib fibers, and 100 gamma-motoneurons compared with only 150 alpha-motoneurons. This means the muscle has 240 nerve fibers for control and only 150 for contraction. Clearly the bias is in favor of control.