Nervous Tissue Flashcards
What is the Neural Tissue function?
Detect and respond to continuous changes in external and internal environment.
The CNS is derived embryonically from [] []
Neural Tube
- Ganglia/Neurons are derived embryonically from [] []
- Except: …..?
- Neural Crest
- Olfactory neurons and spirl aganglia of the cochlea
- Neurons carrying information to the CNS are []
- Neurons carring information from the CNS are []
- Afferent
- Efferent
Neurons are specialized to transmit information to other [] and excitable tissues like []
Neurons and excitable tissues like muscle
- The most common type of neurons in vertebrates is the [] neuron
Multipolar
- [] Neurons have a single axon and multiple dendrites.
- [] Neurons have a singel axon and single dendrite
- [] Neurons have single process at the soma which branches
- Multipolar
- Bipolar
- Pseudounipolar/Unipolar
Functional Classification of Neurons:
- Sensory Neurons: receive [] and [] stimuli and conduct information to appropriate [] centers
- [] Neurons: integrate [] and [] neurons
- Motor Neurons: transmit information from the CNS to other [], [], and []
- Internal and External; CNS
- Integrative Neurons; sensory and motor
- Neurons, Muscles, and Glands
- Sensory neurons include these types of Neurons:…
- Integrative neurons include these types of Neurons:….
- Motor neurons include these types of neurons:….
- Pseudounipolar, Bipolar
- Internuerons, Pyramidal Cells, Pukinje Cell
- Motor neurons, presynaptic/postsynaptic ANS neurons.
What are other names for the neuronal cell body?
Soma or Perikaryon
Neuronal Cell Body:
- Large [] with promients [] nucleolus
- rER is arranged into a basophilic [] []
- Prominent [] apparati and numerous []
- Characteristic of cells with high [] rate and lots of [] transport
- Nucleus; basophillic
- Nissl Body
- Golgi; mitochondria
- metabolic rate; vesicular transport
Neuronal cell body has a significant cytoskeleton containing [] and []
neurofibrils
microtubules
[] spines are small provesses which serve to increase synaptic surface area
Dendritic Spines
T/F
Dendrites cannot make proteins
FALSE
Dendrites CAN make proteins.
T/F
- Distally dendrites have many microtubules; Golgi, ribosomes, and Nissl Body
False
- Distally dendrites have many microtubules; Golgi, ribosomes, and Nissl decreases with distance…
- Proximally dendrites have similar cytological features as soma.
The Axon:
- [] Diameter throughout axon
- Limited by plasma membrane called the []
- Begins at the axon [], Contains no [] or []like the soma.
- Has [], abundant microtubules and []
- Uniform
- Axolemma
- Hillock; Golgi and rER
- Mitochondria; neurofilaments
Where would you find the following cytological structures in a neuron cell? (Soma, Dendrites, Axon)
rER, Golgi, Mitochondria, Microtubules, Neurofilaments, Dendritic Spines
-
Soma:
- Tons of rER, Golgi, Mitochondria, Microtubules, Neurofilaments
-
Dendrites:
- Proximally - same cytological featues as Soma
- Distally - no Golgi, Nissle substance decreases (so rER amounts decrease). Has microtubules, Dendritic spines…probably has neurofilaments
-
Axon
- Has mitochondria and a lot of microtubules and neurofilaments….no organelles
What is the most common form of neuronal synapse?
Chemical
(using neurotransmitters)
Define the following Morphologic Types of Synapses:
- Axodendritic Synapse:
- Axosomatic Synapse:
- Axoaxonic Synapse:
- Dendrodendritic Synapse:
- Functional contact between an axon and a dendrite
- Contact between axon and cell soma
- Contact between 2 axons
- Electric synapses between retina amacrine inte-neurons.
What are the 2 functional types of synapses?
Chemical Synapse (neurotransmitters)
Electrical Synapse (Connected by Gap junctions)
T/F
Amino Acids can act as Nuerotransmitters?
True
Examples: glutamic acid (excitatory), GABA, dopamine, serotonin, glycine
Which neurotransmittes are primarily inhibitory in function?
GABA
Glycine
T/F
Dendrites have a smooth surface that is covered by myelin and have no ribosomes and ER in the cytosol.
FALSE
- Axons are smooth, covered by myeling and have no ribosomes/ER
- Dendrites are the opposite.
Axonal Anterograde Transport entails:
Axonal Retrograde Transport entails:
- Anterograde - Moves materials from the soma, to the terminal buoton
- Fast - used to move vesicles/mitochondria
- Slow - Used for regeneration and carries proteins, enzymes
- Mediated by Kinesin
- Retrograde - Moves materials from the terminal buoton to the soma
- Intermediate rate - recycling and viral transport
- Mediated by Dynein