1. Nervous Tissue

2. Neuron (motor)

3. Parts of a Neuron
Nerves – bundles of neurons held together by connective tissue (found in PNS)
Neurons – specialized nerve cells that make up both the CNS and PNS
- many different types
Dendrites – extensions of cell body that conduct nerve impulses toward cell body

4. Parts of a Neuron
Axons – carries impulse away from cell body to next nerve cell, muscle or gland
Myelin – lipid sheath that covers some axons, provides a thick pad of insulation
Schwann cells – places on axon covered with myelin sheath
Nodes of Ranvier – gaps between Schwann cells, no myelin at that spot

5. Neural Circuits receptor cells receives sufficient stimuli
sensory (afferent) neurons carry info to CNS
Interneurons in CNS interpret info and stimulate motor neurons
motor (efferent) neurons carry info to effectors (muscles, glands, organs)
response to stimuli is produced

6. Reflex Arc involuntary & unconscious
stimuli to spinal cord via sensory
interneurons interpret respond via motor (send info to brain at same time)
effectors activated
prevents damage in cases of emergency
YouTube - The Nervous System ( Animation )