Card Set Information
Chapter 24: Nervous System
What receives, processes and sends info thru the body quickly?
Invertebrate/ Vertebrate Nervous System
All animals except sponges have nervous syst.
Nerve net (jellyfish)- ladder-like w/ ganglion
Flat worm/earthworm- simple brain w/ nerve cord
Crab/squid- well defined brain, sense organs
Nervous syst. most complex in vertebrates, highly
Cephalization- sensory cells concentrated in head
Humans well-developed nervous syst
2 major subdivisions
: brain & spinal cord
: all nervous tissue outside CNS
Nervous tissue: 2 main cell types
: functional unit of nervous syst
: receive stimuli
-Cell body w/ nucleus
-Axon (nerve fiber)
: conducts up to 3'.