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Criado por Diamond Sapphire
quase 4 anos atrás
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Excitable cells that communicate via neurotransmitters; found in the brain, spinal cord, peripheral nerves, and secretory structures
"cell body," "Perikaryon;" contain nucleus, cytoplasm, and nissl substance
spheroidal shape; centrally placed; size is directly proportional to size of the neuron.
Sex chromatin that may be found in the vicinity of the nucleolus or nuclear membrane
Why is the neuron's cytoplasm rich in nissl substance?
Composed of axon and dendrites
starts at the axon hillock and ends at terminal bouton
The axon terminal of a_ _is usually in contact with the dendrite of a _ _.
The extent of branching of the dendrite is described as...
What are the 5 categories of neurons?
sensory neurons that from the body wall entering the spinal cord through the dorsal root
Sensory neurons generally found in sense organs such as olfactory epithelium, retina,
and cochlear
"Typical" textbook neuron; mostly motor neurons in the ventral horn of the spinal cord or cortex of the brain
Most sensory neurons are_?
a large cell body requires _ excitatory input to become "excited"
Presynaptic terminals (AKA telodendrons) is usually based on the type of _ that has been detected in the neuron or parts of the brain where they are localized
_ _ contains cell bodies and _ _ contains mylenated axons
Also called the post- synaptic density because it is rich in structural proteins, cytoskeleton, receptors, ion channels, junctional complexes, and enzymes; significant amount on mitochondria present at post-synaptic site.
what are the 4 types of synapses?
chemical junction between a nerve terminal and a muscle spindle
The neurotransmitter acting across the NMJ is...?
Support neurons structurally and metabolically; processes terminate in expansions called end feet
How do astrocytes represent a source of reserve energy?
How do astrocytes stop ongoing synaptic activity?
Macrophages that are very active in neuroinflammation
in grey matter _ serve as perineuronal satellites ; in white matter they form myelin sheaths around axons, speeding up action potential propagation in CNS
Form myelin sheaths around neurons in the peripheral nervous system
Form an epithelium that lines ventricular cavities within the brain and the central canal of the spinal cord; typically cuboidal or columnar with numerous motile cilia on their apical surfaces
Groups of neurons
___ ___ is the longest nerve
Neurons are held together by what 3 connective tissues?
Grey or white matter?
Grey or white matter?
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Sensory or motor?
Sensory or motor?