Biology report 2nd semester part 3

Nervous System
is the body's computer
3 systems of the nervous system
Central nervous system:
controls all basic bodily functions and responds to external changes
Peripheral nervous system:
provides a complete network of motor and sensory fibers connecting the CNS to the rest of the body
Autonomic nervous system
parallels the spinal cord but is separated involved in control of exocrine glands, blood vessels, viscera and external genitalia
The nervous tissues are made up of two specialized cells:
1.Neuroglia or Glial cells
- cells in the nervous tissues that allow it to perform nervous system functions
2.Neurons
- all of the control functions of body are being transferred with the neurons.
- they work like messengers
Spinal Cord
- has 31 segments, each with a pair of spinal nerves
- ventral root is integral to motor functions and the dorsal root is integral to sensory functions
Pictures:
http://www.cedars-sinai.edu/images/468380_SPINALCO_copy.jpg
http://crystalskullworld.com/Neuron.gif