The clams nervous system is not very complex because a clam does not even have a brain. The brain is the major part of a complex nervous system and requires it to function. In the clam, the nervous system consists of a nerve network and a series of paired ganglia. The cerebral ganglia controls the sensory organs and the pedal ganglia control the foot. That conversation the major areas of the clam and makes for a very simple system.

The frog on the other hand, has a very complex nervous system that is broken up into three different groups: central, peripheral, and autonomic. The central nervous system contains the brain and the spine. The peripheral nervous system contains crawfish and spinal nerves. The autonomic nervous system contains sympathetic and parasympathetic chains of ganglia.

The NERVOUS System