Fast vs Slow
Squid, cat axon (myelin and diameter)
Electrical synapses mediated by one gene – connexion hexamers.
Slowest action potentials – tiniest unmyelinated fibers.
Ligand gated – ionotropic fastest
Need to know 4 types of receptors iono metabo tyrosine steroid (lipid soluble)
Fewer synapse means faster
PnC giant neurons – fast reflex
Visual cues not as fast – to SC – then replayed through interneurons. Retinal map compared with
auditory map. Auditory info coming from inferior colliculus. Trigeminal – tactile info – whiskers.
Saccadic eye movement – jumping, quick eye movement to target. Almost no delay in response.
Fast foveation of visual stimulus. Vertical – midbrain oculomotor. Horizontal – pons abducens.
Moderate stimuli, crossed tectospinal
Avoidance – big large coming from behind , uncrossed tectopontine, deep layers of SC.