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Chap 10 A&P Nervous

The Human Body in health and Illness / Nervous System: Nervous tissue and Brain

Brain and Spinal Cord Central Nervous System (CNS)
Nerves that connect to the CNS with the rest of the body Peripheral Nervous System
Gathers information from inside the body and from the outside environment Sensory Function
Sensory information brought to the CNS is processed or interpreted by Integrative Function
Conveys information from the CNS toward the muscles and glands Motor Function
The nerve glue. most abundant of the nerve cells; located in the CNS. ___ support, protect, insulate, nourish, and generally care for the neurons. Neurogila / Glial Cells
Star shaped cells present in blood brain barrier; also anchor or bind blood vessels to nerves for support act as phagocytes Astrocytes
Line the ventricles as part of the choroid plexus; involved in the formation of cerebrospinal fluid Ependymal cells
Protective role; phagocytosis of pathogens and damaged tissue Microgila
Produce myelin sheath for neurons in the PNS Schwann cells
Produce myelin sheath for neurons in the CNS Oligodendrocytes
Most important in the transmission of information Neuron
Treelike structures that receive information from other neurons that transmit to the cell body Dendrites
Contains the nucleus and is essential for the life of the cell Cell body
A long extension that transmits info away from the cell body Axon
End of the Axon where the chemical neurotransmitters are stored Axon Terminal
White fatty material that protects and insulates the Axon Myelin
The nuclei and cytoplasm of the schwann cell lie outside they myelin sheath Neurilemma
Areas not covered by myelin appear regularly along the Axon Nodes of Ranvier
Carries information from the periphery (the end of the nerve) toward the CNS Sensory Neuron / Afferent Neurons
Carries information from the CNS toward the periphery (the end of the nerve) Motor Neuron / Efferent Neurons
Found only in the CNS; form connections between sensory and motor neurons interneuron
An electrical signal that conveys information along a neuron Nerve impulse
A process of polarization, depolarization and repolarization Action potential
Resting; The inside of the neuron is more negative then the outside Polarization
Stimulated; The inside of the cell changes from negative to positive Depolarization
Resting; The inside of the cell again becomes negative, returns to its resting state Repolarization
"Jumping" from node to node is called Saltatory conduction
Helps information move from one neuron to the next; its a space Synapse
The axon terminal does not physically touch the dendrite this space is called Synaptic cleft
The axon terminal contains thousands of tiny vesicles that store chemical substances called Neurotransmitters
Substances that terminate the activity of the neurotransmitters when they have completed their task Inactivators
Places on the membrane to which the neurotransmitters attach, or bind Receptors
Clusters of cell bodies in the CNS Nuclei
Clusters of cell bodies in the PNS Ganglia
Created by: dhollan127