Specialized Cell & External Factors
Of The Nervous System
External Factors That Affect The Nervous System
Specialized Cells In The Nervous System
transmit nerve messages
variable in size and shape
Dendrites - receive information from another cell and transmit the message to the cell body.
Cell Body - contains the nucleus, mitochondria and other organelles typical of eukaryotic cells.
Axon - conducts messages away from the cell body.
Sensory neurons - have a long dendrite and short axon, and they carry messages from sensory receptors to the central nervous system.
Motor neurons - have a long axon and short dendrites, and transmit messages from the central nervous system to the muscles or to the glands.
Interneurons - found only in the central nervous system where they connect neuron to neuron.
Glial cell (or glia)
in direct contact with neurons and often surrounds them
do not conduct electrical impulses
- most abundant cell in the central nervous system