nervous system Flashcards
roles of the nervous system
- generate and transport electrical impulses
- intergrate the received information
- stimute muscles for movement
-made up of the CNS and VNS
-a network of neurons
nervous system
generate electrical impulses (action potential)
neurons
-integrates and controls the behavior
-dense cluster of interconected neurons that process sensory info or control motor output
NERVE CELL BUNDLE
Segmental Ganglia
a bundle of dendrites or axons that serve the same part of the body
nerve
are typically found grouped in bundles
nerve cells
parts of the neuron
-nerve cell body (nucleus is found)
-dendrites (filamentous arborescent)
-axon (axis cylinder process)
-collaterals (derived from a main branch)
signal transmission is always
UNIDIRECTIONAL
toward - dendrite and collateral
away - axon
carry information towards the CNS
afferent or sensory neurons
conducts signals away from the CNS
Efferent or motor neurons
branching axons that conducts signals within the CNS
internuncial or interneurons
connection point of individual nerve cells
synapses
chemical messenger or neurotransmitter substance of synapses
acetycholine, dopamine, noradrenaline
consist of paired segmental ganglia
ventral nerve cord
a dorsal brain linked to a ventral nerve cord; supervises and coordinates activities of the insect
central nervous system