Two functions of the nervous system a. Somatic, voluntary movement b. autonomic, involuntary movement.

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Presentation transcript:

Two functions of the nervous system a. Somatic, voluntary movement b. autonomic, involuntary movement

The central nervous system contains the brain and the spinal cord.

The peripheral nervous system- Consists of all nerves on the edge of or outside of the CNS.

Parts of the rat brain

Function of intervertebral disks- Cushions and protects the spinal cord and vertebrae.

Cells of the nervous system Neurons and ganglia

Types of neurons Neurons come in many sizes. For example, a single sensory neuron from your fingertip has an axon that extends the length of your arm, while neurons within the brain may extend only a few millimeters. They also have different shapes depending on their functions. Motor neurons that control muscle contractions have a cell body on one end, a long axon in the middle and dendrites on the other end. Sensory neurons have dendrites on both ends, connected by a long axon with a cell body in the middle. Interneurons, or associative neurons, carry information between motor and sensory neurons.

Parts of a neuron

Function of neuron parts A Cell body- Produces proteins B nucleus- Information, DNA C Dendrites- receive signals from other nerves D axon- sends messages E Myelin sheath-protects axon F Nodes of Ranvier- cause impulses to move more quickly along the neuron G Axon terminals contain neurotransmitters make contact with other nerves

How a neuron works