INTRODUCTION The nervous system and the endocrine system together play an important role in our body. It works to maintain the homeostasis of our body and allows us to survive. The nervous system detects changes in our body and responds to those changes. NERVOUS SYSTEM BRAIN AND SPINAL CORD AFFERENT ( SENSORY ) NERVE EFFERENT (MOTOR) NERVE SOMATIC (MOTOR) NERVE SYMPATHETIC PARASYMPATHETIC. Brain contains a large number (100 billion) of