Sec. 2Divisions of the Nervous System

nervous system

central nervoussystem

peripheral nervous system

central nervous system

• control center of body

• incl:1.brain2.spinal cord

Brain &

Spinal Cord

central nervous system

brain

• contains about 100 billion neurons

3 mainregions of brain

cerebrum cerebellum brain stem

cerebrum

• largest part of brain

• interprets input from senses

• controls movement of skeletal muscles

• divided into right half & left half

– right half creativity & artistic ability

– left half math skills, speech, writing, logical thinking

cerebrum

cerebellum• muscular coordination

• balance

brainstem

• controls involuntary actions

–breathing, heartbeat

peripheral nervous system

• all the nerves located outside of central nervous system

• divided into 2 groups:

1. somatic system- controls voluntary actions

2. autonomic system- controls involuntary actions

reflex• automatic response that occurs

very rapidly & without conscious control

nervous system injuries

1. concussion= bruiselike injury of brain

2. spinal cord injury= spinal cord is cut or crushed

Ouch !!!!!

It may be a concussion????

Spinal cord injury

Christopher Reeve as Superman

Christopher Reeve

The Man of Steel

Christopher Reeve

Spinal cord injury

Quadripalegic