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Daphne Sumodlayon posted an update in the group
MT30-Histology Art AB 3 years, 8 months ago Nervous tissue is found in the brain, spinal cord, and nerves. It is responsible for coordinating and controlling many body activities. It stimulates muscle contraction, creates an awareness of the environment, and plays a major role in emotions, memory, and reasoning.
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Structure of a neuron:
Cell body – contains numerous organelles and a cell nucleus that produces RNA for protein synthesis. It also produces proteins that are consumed by other parts of the neuron in order to function properly
Processes (axon & dendrites) – finger-like projections from the cell body that is able to conduct and transmit signals. The dendrites receive electrical messages and transfer received information to the soma. The axon form branches to send messages to several neurons at once
Five types of neurons:
– Unipolar (pseudo unipolar) – single, short processes
– Multipolar – three or more processes
– Pyramidal – neurons with a pyramidal shaped cell body and two
distinct dendritic trees
– Bipolar – two processes
– Purkinje – have multiple dendrites that fan out from the cell body
Two types of neuroglia in PNS:
Satellite cells – flattened cells with prominent nuclei that surrounds nerve cells of ganglia. They insulate and support neurons of ganglia
Schwann cells – flattened cells with a flattened nucleus that form myelin sheath in the peripheral NS