Neuron Nucleus Axon terminal Cell body Myelin sheath Dendrites Axon nodes
Answer the following question?????? Q: What is the function of the nervous system? a: Controls and coordinates functions throughout the body and responds to internal and external stimuli
A couple more tests…… Lets check your vision!
How many black dots can you count?
Are the lines straight or bent?
Is this a spiral?
Which inside circle is bigger?
How many legs does the elephant have?
Do you see a girl or a musician?
Back to the Nervous System notes……
peripheral nervous system (PNS) your nervous system is divided into the central nervous system (CNS) which is the brain and spinal cord Medical Art Service, Munich /, Wellcome Images and the peripheral nervous system (PNS) Credit Medical Art Service, Munich /, Wellcome Images which connects everything to the brain and spinal cord
The Peripheral Nervous System
The Peripheral Nervous System This is the name of the nerves that are connected to the brain and spinal cord on one end and various parts of the body on the other. The peripheral nervous system can be divided into the sensory division and the motor division. Sensory division Motor division
Sensory Division and Motor Division The sensory division transmits impulses from the sense organs to the central nervous system. The motor division transmits impulses from the central nervous to the muscles or glands.
The Motor Division is further divided into the somatic nervous system and the autonomic nervous system.
Somatic Nervous System Nerve bundles that you can control (voluntary), such as movement It reacts to outside stimuli affecting the body such as in touch, cuts, heat and cold sensations. If you step on a tack, sensory receptors , stimulate a sensory neuron, which relays a signal to the spinal cord, which then sends a signal to a motor neuron to lift your leg.
Autonomic Nervous System Autonomic Nerves – nerves that you can not control. (involuntary) regulates the functions of our internal organs such as the heart, stomach and intestines. 2 types of autonomic nerves: sympathetic – fight or flight parasympathetic – rest and digest
Sympathetic Nervous System speeds up the body and prepares it for “fight or flight” These nerves lead to all vital organs (liver, pancreas, stomach, intestines, heart, blood supply, sweat and salivary glands) They prepare your body for action! Let’s look at some examples
Parasympathetic Nervous System slows the body down, acts as a brake Allows your body to “rest and digest”
Which activates the parasympathetic nervous system and which one activates the sympathetic nervous system?
Let’s look at an example of your nervous system at work…