1. Divisions of the Nervous System

2. Central Nervous System (CNS)
Consists of the brain and the spinal cord.
made up of mostly interneurons.
Spinal cord: a thick column of nerves that connects the brain to most of the nerves in the peripheral nervous system.
Brain: three regions the cerebrum, cerebellum, and brainstem.
The spinal cord is only about 45 cm long, while the vertebral column is about 71cm long

4. Meninges: three layers of protective tissue in the brain and spinal cord
Cerebral Spinal Fluid: fluid that cushions, provides nourishment & removes waste from the brain and spinal cord
Arachnoid matter is spiderweb like in consistency

5. Paralysis
The loss of muscle function for one or more muscles. Most paralysis is due to injury of the nervous system, in particular, the spinal cord.
When something goes wrong with the way messages pass between your brain and your muscles.
Strokes, spinal cord injury, broken neck.
Bell’s palsy is paralysis of the face.
Stroke is when blood to a part of the brain is cut off; no oxygen to that part, so cells start to die
An aneurysm is when an artery wall is weakened and it bulges out, sometimes bursting.
Cerebral palsy affects a persons ability to move, damage to the brain typically before birth

6. Two divisions : sensory division and motor division
Peripheral Nervous System (PNS)
Two divisions : sensory division and motor division

7. The Sensory Division
Consists of sensory neurons

8. The Motor Division Consists of motor neurons
Carry out both voluntary and involuntary actions

9. Nervous System Central Peripheral
Brain
Sensory Division
Motor Division
Spinal Cord
Interneurons
Sensory neurons
Motor neurons