Nervous System

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Created Dec 6, 2006
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1
Nervous system function
 
Adaptation, maintains homiostatis in the body. Receives external and internal information and...
2
Somatci Nervous System
 
Glands or muscles carries out command
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Central Nervous System
 
Brain and Spinal Cord
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Visceral Nervous System
 
Controls smooth muscle and soft body parts, cardiac muscle and viscera
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Automomic Nervous System
 
Involuntary division automatic activity
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Peripheral Nervous System
 
Cranial Nerves:large nerves of the brain carry impulses to and from the brain. Spinal Nerves:...
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Spinal Nerve
 
Large nerves off the spinal cord
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Myelin Sheath
 
Covering of inulation of some axons
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Myelinated Axons
 
Called white fibers found in white matter of brain and spinal cors & nerve trunks
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Grey Matter
 
Fibers & cell bodies of grey matter are NOT covered with myelin
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Cells of the brain and spinal cord
 
Are myelinated by other nueroglia they have NO neurilemmia
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Parasympathetic Nervous System
 
Body in relxation, body functions return to normal
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Sympathetic Nervous System
 
Times of stress and emotion, fight or flight
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Cranial Nerves
 
Large Nerves from the brain
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Effector
 
Voluntary all effectors are skeletal muscles
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Sensor Neuron
 
Carries impulses to CNS receiptors
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Motor Neuron
 
Carries Impulses AWAY from the CNS sends message to recieptors
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Dendrite
 
Neuron fibors carry impulses to the cell body, RECIEPTOR Receives the stimulus begins neuron...
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Axon
 
Neuron fibers conduct impules AWAY from the cell body to another neuron or muscle or gland,...
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Neuroglia
 
Conducting tissue serve for support and protection.AKA glial Protects: Nervous tissue Supports:...
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Myelin
 
Fatty substance neuron fibers, that insulate & protects the fiber
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Schwann Cells
 
In PNS is prduced by special neuroglia wrap around axon like jelly roll dipositiong layers...
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Neurilemma
 
Outermost membranes of schwann cells. Thin coating mechanism by which some peripheral nerves...
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Neuron
 
Conducting cell of the nervous system
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Cell body
 
Contains the nucleus and other organelles found in 2 places. CNS and Ganglion
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Ganglion
 
Groups of nerve cell bodies outside the CNS,close to the spine
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Myelin
 
Fatty material tha covers and insulates axons, found in 2 places. Peripheral Nervous System White...
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Nodes of Ranvier
 
Empty spaces between sections of myelin on the axon
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Motor End Plate/Neuromuscular juntion
 
The point at which a nerve fiber contact a muscle cell
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Nerve
 
Bundle of neuron fibers in the peripheral nervous system
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Tract
 
Bundle of neuron fibers within the CNS that act as a unit (form a pathway) Sensory tract takes...
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Center
 
A collection of cell bodies in the brain that regulates one function Ex/ Respiratory, cardiac,...
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Chemical Changes
 
Occur in spaces between neuron and between neurons and muscles called Synapses. 1.At end of...
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Electrical Changes
 
Occur along the lenght of the neuron.Dendrites and Axions. These changes involve ions, which...
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Spinal Cord
 
Location: Vertebral canal
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Cauda Equnia
 
The nerves that hang below off the end of the spinal cord, seperates into seperate nerves.
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Grey matter
 
H shapes in the brain and continues down the spinal column on each side up and down dorsally,...
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Dorsal Horns
 
Sensory fibers, Stimulus into the spinal cord
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Ventral Horns
 
Motor fibers stimulus out of the spinal cord,
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Tracts
 
Asending: Sensory to brain and from brain Desending: Motor out of brain to the body. Central...
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Functions of Spinal Cord
 
Primary: Transmit sensory impulses to the brain. Motor impulses from the brain to the body Center...
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Reflex Arch
 
Patellar reflex (no brain involment) Knee jerk reflex
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Menniges
 
Connective tissue membraes cover brain and spinal cord
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4 layers of Menniges
 
Dura matter: thick tough very proctive Archnoind matter: middle layer contain spider like...
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Crebro spinal fluid
 
Formed from blood plasma in the cells of 4 ventricles of the brain.
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Name 4 Ventricles
 
1st 2nd 3rd 4th
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Structure of Neuron
 
Cell body Cell fibers: Dendrite: carries impulses to cell body Axon: carries impulses away...
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Types of neurons
 
Sensory(afferent)carries impulses toward CNS Motor(efferent)carries impulses away from CNS
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Cerebral spinal fluid flow
 
through all ventricles of brain to central canal of spinal cord, subarchnoid reabsorbs CSF...
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Characteristics of CSF
 
Clear colorless,alkiline PH sterile no bacteria A few WBC H20 glucos and protein.
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Peripheral Nervous System
 
Branch of Brain and spinal cord arises underside of brain. 12 prs of cranial nerves. Supply...
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Spinal Nerves
 
31 prs.
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Function of spinal nerves
 
supply sensory & motor blelow shoulders Roots are spinal column
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Name cranial nerves and their function
 
Olfactory:sense of smell Optic:sense of sight Oculomotor:movement of the eye ball Acoustic(Vestibulocchlear)...
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Sciatic nerve location
 
Bottom of spine through butt, legs and heels** Major nerve
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Central and perepherial
 
nerves are by location
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Automotic
 
are by action

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