Nervous Systemcommunication and coordination network throughout the

animal’s body

Neuron – nerve cell specialized for carrying signals from one part of the body to another

Nerve – communication line made from bundles of neuron fibers wrapped in connective tissue

Divisions of the Nervous System

• CNS – central nervous system

• Brain and spinal cord

• PNS – peripheral nervous system

• Nerves that carry impulses in and out of the CNS

3 functions ofthe N.S.

1. Sensory input – sensory neurons carrying impulses from sense organs to CNS

2. Integration – interneurons (found only in the CNS) interpreting the sensory signals and creating a response

3. Motor output – motor neurons conducting signals from integration to effector cells (muscle cells) *(effector cells perform body’s responses)

NEURONS