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Nervous System

SPC Goswami ATE1211

QuestionAnswer
What shape is a nervous cell? Smooth or Stellate  
What is another name for Cell Body? Soma  
What is a Chromatophilic Substance comprised of? clusters of Ribosomes  
Microtubules extending from the Axon are known as? Neurofibrils  
Where Soma are concentrated they form? Ganglia or Nuclei  
What are Dendrites? Short, highly Branched extensions of the cell body  
What do Dendrites do? carry Impulses INTO/TOWARD the cell body  
What is an Axon? Long, Slender extension of the cell body  
What is the function of the Axon? to carry impulses AWAY from the cell body  
What are Axons insulated by? Neuroglia  
Why are Axons insulated? to protect them and other neurons from the electrical impulses traveling within them  
Name 2 types of Terminal Filaments. Synapse and Neuromuscular Junction  
What is a Synapse? a Terminal Filament when joined to a Dendrite of another Neuron  
What is a Neuromuscular Junction? a Terminal Filament when joined at a Muscle cell  
Define Amitotic. Cells NOT capable of cell division (replication) - Adult nerve cells  
What are Neuroglia, and where are they found? they are Supportive Cells found among/AROUND neurons (axons)  
Name 3 types of Neuroglia. Schwann Cells, Oligodendrocytes, Astrocytes  
What are Schwann Cells and what is their function? Neuroglia - 1. provide Support and Axon Insulation (myelination); 2. improve SPEED of Nerve Impulses  
Where are Schwann Cells located? wrapped Around PERIPHERAL Neurons  
What are Nodes of Ranvier? GAPS between Schwann Cells  
What do Nodes do? serve as RELAY points for Nerve Impulses  
What are Oligodendrocytes and where are they located? Neuroglia - wrapped around Central Neurons  
What is the function of Oligodendrocytes? Their main functions are to provide support and insulation to axons in the central nervous system
What is the main difference between Schwann Cells and Oligodendrocytes? Schwann Cells insulate PERIPHERAL Neurons; Oligodendrocytes insulate CENTRAL Neurons  
What are Astrocytes and where are they located? Neuroglia - Crowded among CENTRAL Neurons  
What are the functions of Astrocytes? 1. Support and Link neurons to blood Capillaries; 2. regulate Diffusion --. contribute to the Blood-Brain Barrier  
What are the Neuron Functional Types? Afferent (sensory), Efferent (motor), Interneurons (association)  
What is the function of Afferent Neurons? impulses travel TOWARD Brain, FROM Sensory receptors in Skin and Organs  
What is the function of Efferent Neurons? impulses travel AWAY from Brain, into Effectors (muscles/glands)  
What are the functions of Interneurons? 1. transmit impulses BETWEEN Neurons in the CENTRAL nervous system; 2. help in ANALYSIS of SENSORY input and coordination of MOTOR output  
What are the Neuron Structural Types? Multi-polar and Unipolar  
Describe a Multi-polar Neuron. multiple Dendrites; one long Axon - usually in MOTOR function  
Describe a Unipolar Neuron. one process SPLITS near cell body - usually in SENSORY function  
What is the function of the Presynaptic Neuron? reacts to Arriving Impulses  
What is the function of Synaptic Vesicles? Contain/Release Neurotransmitters  
What is the Synaptic Cleft? narrow GAP between nerve cells  
What is the function of the Postsynaptic Neuron? reacts to Neurotransmitters  
What is the definition of Transmission? the Sequence of events in Impulse  
What are the sequences of events involved in Transmission? Presynaptic impulses --> rupture of Synaptic Vesicles --> release of Neurotransmitter --> new, Postsynaptic impulse(s)  
What is the difference between the CENTRAL Nervous System and the PERIPHERAL Nervous System? CENTRAL Nervous System: Brain and Spinal Cord; PERIPHERAL Nervous System: Nerve Trunks leading To/From the Brain and Spinal Cord  
Created by: Rsande11
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