Lecture—05 December 2003

Analog versus digital

Cnidaria Porifera

Can responds by cell to cell contact

Subepithelial nerve net

Platyhelminthes

Nerve net==sensory inputs to the organism

Ladder type central nervous system

Sensory and motor

Simple reflex arc

Two nerve cells

Sensory and the other motor

Central nervous systems

Neuron—processes and cell bodies.

Those coming are dendrites

Those leaving are axons

Nerve=collection of processes

Ganglion==collection of nerve cell bodies

Memory

Hardwired

Softwired

Molecular manner

Interconnections between neurons

Movement of information across the synapse by chemical means

Temporal summation

Spatial summation