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The Nervous SystemThe Nervous System
Physical Therapy AcademyMs. Treto
Engage
• As a class visit IQ Test Labs at www.intelligencetest.com/reflex/index.htm
• Select various students to come to the computer and test their skills on the different reflex/reaction tests. This website states that scientific tests have shown that reaction times to simple tasks have high correlations with g the general intelligence factor. Students should have fun attempting these reaction time games.
How can you add eight 8's to get the number 1,000? (only use addition)
Brain TeaserBrain Teaser
The key to this math riddle is realizing that the one place must be zero. 888 + 88 + 8 + 8 + 8 = 1,000
Brain TeaserBrain Teaser
If you were running a race, and you passed If you were running a race, and you passed the person in 2the person in 2ndnd place, what place would place, what place would you be in now?you be in now?
SecondSecond
Brain TeaserBrain Teaser
A H I M N O T U V W
Which of the letters above does not belong with the rest?
N It is not a mirror-image of itself
Brain TeaserBrain Teaser
There is a town where 5% of all the people There is a town where 5% of all the people living there have unlisted phone numbers. living there have unlisted phone numbers. If you selected 100 names at random from If you selected 100 names at random from the town’s phone directory, on average, the town’s phone directory, on average, how many of these people would have how many of these people would have unlisted phone numbers?unlisted phone numbers?
0 They would not be in the phone book if 0 They would not be in the phone book if their number was unlistedtheir number was unlisted
Functions of the Nervous SystemFunctions of the Nervous System
1.1. Control center for all body activitiesControl center for all body activities2.2. Responds and adapts to changes that Responds and adapts to changes that
occur both inside and outside the bodyoccur both inside and outside the body (Ex: pain, temperature, pregnancy)(Ex: pain, temperature, pregnancy)
Central Nervous SystemCentral Nervous System
NeuronsNeurons : microscopic : microscopic nerve cells that make nerve cells that make up the brain, spinal up the brain, spinal cord, and nervescord, and nerves
- 30,000 neurons can fit - 30,000 neurons can fit on a pinheadon a pinhead
Anatomy of a NeuronAnatomy of a Neuron
Each neuron contains:Each neuron contains: - - Cell bodyCell body with with
nucleusnucleus - - DendritesDendrites : fibers that : fibers that
receive messages from receive messages from other neuronsother neurons
- - AxonsAxons : fibers that : fibers that send messages to other send messages to other neuronsneurons
• Neurons do NOT touch; Neurons do NOT touch; there is a gap between there is a gap between them called a them called a synapsesynapse
• Messages are sent Messages are sent across the synapses by across the synapses by special chemicals called special chemicals called neurotransmittersneurotransmitters
Communication Between Communication Between NeuronsNeurons
- The use of The use of neurotransmitters neurotransmitters causes an electrical causes an electrical currentcurrent
There is enough There is enough electrical current in electrical current in the brain to power a the brain to power a flashlightflashlight
Two Major Divisions Two Major Divisions of the Nervous of the Nervous
SystemSystem
Central Nervous SystemCentral Nervous SystemBrainBrain : a mass of 100 : a mass of 100
billion neurons located billion neurons located inside the skullinside the skull
-Learning occurs as more -Learning occurs as more and stronger and stronger connections are made connections are made between neuronsbetween neurons
Anatomy of the BrainAnatomy of the Brain
CerebrumCerebrum : largest part of : largest part of human brainhuman brain
- Responsible for:- Responsible for: - Thought- Thought - Language- Language - Senses- Senses - Memory- Memory - Voluntary movement- Voluntary movement
Retrieval of a MemoryRetrieval of a Memory
A memory is not a A memory is not a snapshot stored in the snapshot stored in the brain – it must be put brain – it must be put together from together from information stored in information stored in various parts of the various parts of the brainbrain
Anatomy of the BrainAnatomy of the BrainCerebellum : at base of
brain-Responsible for: - Muscle coordination - Balance - Posture
Anatomy of the BrainAnatomy of the BrainBrain StemBrain Stem : connects : connects
brain to spinal cordbrain to spinal cord-Responsible for:-Responsible for: - Breathing- Breathing - Swallowing- Swallowing - Heartbeat- Heartbeat - Blood pressure- Blood pressure
Central Nervous SystemCentral Nervous SystemSpinal CordSpinal Cord : Column of : Column of
nerves from brain to nerves from brain to tailbone – protected by tailbone – protected by vertebrae of spinevertebrae of spine
- Responsible for:Responsible for: - Conducting - Conducting
impulses between the impulses between the brain and the rest of brain and the rest of the bodythe body
*Impulses may travel as *Impulses may travel as
fast at 268 miles/hrfast at 268 miles/hr
Peripheral Nervous SystemPeripheral Nervous System
NervesNerves : visible bundles : visible bundles of axons and dendrites of axons and dendrites that entend from the that entend from the brain and spinal cord to brain and spinal cord to all other parts of the all other parts of the body body
-Responsibilities:-Responsibilities: - - Sensory nervesSensory nerves - -
carry messages from carry messages from body to brain (pain, body to brain (pain, pressure, temperature)pressure, temperature)
- - Motor nervesMotor nerves – carry – carry messages from brain messages from brain to body to respond to body to respond
• Divided based on vertebral locations• 8 cervical• 12 thoracic• 5 lumbar• 5 sacral• 1 coccygeal• Cauda equina (“horse’s tail”):
collection of nerve roots at inferior end of vertebral canal
Spinal Nerves:
Protection:BoneMeningesCSF (cerebrospinal fluid)
3 meninges:•dura mater (outer)•arachnoid mater (middle)•pia mater (inner)3 potential spaces•epidural: outside dura•subdural: between dura & arachnoid•subarachnoid: deep to arachnoid
Problems of the Nervous SystemProblems of the Nervous System
ConcussionConcussionA temporary disturbance A temporary disturbance
of the brain’s ability to of the brain’s ability to function due to a hard function due to a hard blow to the headblow to the head
ParalysisParalysisA loss of sensation and A loss of sensation and
movement of part of movement of part of the body due to an the body due to an injury of the spinal injury of the spinal cord or braincord or brain
Parkinson’s DiseaseParkinson’s DiseaseThe brain does not produce enough of the The brain does not produce enough of the
neurotransmitter that transmits messages from neurotransmitter that transmits messages from the brain to the musclesthe brain to the muscles
Symptoms: tremors, rigid muscles, shuffling walk, Symptoms: tremors, rigid muscles, shuffling walk, and loss of facial expressionand loss of facial expression
Red areas Red areas show where show where chemical is chemical is storedstored
Alzheimer’s DiseaseAlzheimer’s DiseaseA gradual shrinking of the neurons in the cerebrumA gradual shrinking of the neurons in the cerebrumSymptoms: memory loss, emotional disturbances, Symptoms: memory loss, emotional disturbances,
inability to function on own, deathinability to function on own, death
EpilepsyEpilepsyAbnormal transmission of messages between the Abnormal transmission of messages between the
neurons in the brain neurons in the brain Symptoms: seizuresSymptoms: seizures