Nervous System

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


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