Nervous System and the Senses

1. Sensory systems
   1. Vision
      1. Tapetum lucidum - creates eye shine
      2. Rods and cones
      
      
   2. Hearing
      1. Range of human hearing
      2. Ultrasound (frequency >20,000 Hz)
      3. Infrasound (frequency <20 Hz)
      
      
   3. Taste
   4. Olfaction
   5. Touch
   6. Electroreception
      • platypus bill
      • platypus bill showing distribution of electroreceptors
      • movie of platypus foraging
   
   
2. Central nervous system
   1. Enlarged and convoluted cerebral hemispheres
   2. Corpus callosum

The Howard Hughes Medical Institute electronic publication Seeing, Hearing and Smelling the World is a great site to visit to learn more about mammalian (and particularly human) sensory sytems.