Question

1. what is the peripheral nervous system? 20. why cant you tickle yourself?

Explanation:

The peripheral nervous system consists of all the nerves outside the brain and spinal cord. It is divided into the somatic nervous system (controls voluntary movements) and the autonomic nervous system (controls involuntary functions like heart - rate and digestion). When you try to tickle yourself, the brain predicts the sensation based on the motor commands it sends to your body. Since it anticipates the input, the surprise element which is crucial for the tickle response is missing.

Answer:

1. The peripheral nervous system consists of all the nerves outside the brain and spinal cord, divided into the somatic and autonomic nervous systems.
2. You can't tickle yourself because the brain predicts the sensation from self - initiated movements, removing the surprise element needed for the tickle response.