1. Sensory Systems Interpreting the environment (and ourselves) human vision (R+G+B) only UV vision (UV) “bee vision” (UV+G+B) “bird vision” ( UV+R+G+B)

2. Sensory Receptors • Respond to specific stimuli and convey information … • Converting information into … • Thus, all sensations reach the brain as … • How do we interpret the information? BhutJolokia pepper

3. Sensory Receptors • Sensory neuron • Often, tissue surrounding dendrites act as… • Sensory neuron + associated tissue = Fig. 17.1

4. Sensory Receptors • Sensory receptors act as … • Translates energy from … • PA system: sound waves  electrical energy • What about sensory receptors?

5. Sensory Receptors • General sensory receptors: • Touch, temperature, proprioception • Special sensory receptors: • Usually specialized

6. General Sensory Receptors Fig. 17.2

7. General Sensory Receptors • Free sensory receptors: • Lacks specialized … • May branch (=arborize) to … • Pain, touch, pressure BhutJolokia pepper

8. General Sensory Receptors • Encapsulated sensory receptors: • Terminus of sensory process enclosed in… • Encapsulation aids … • Meissner’s corpuscle – • Corpuscle of Ruffini – • End-bulb of Krause – • Pacinian corpuscles –

9. General Sensory Receptors • Associated sensory receptors: • Terminus of sensory process … • Stimulated by associated organ being stimulated • Nerve endings at base of hair follicle

10. Interpreting General Sensory Input • Read p. 674 • Theory of specific nerve energies vs. pattern theory of sensation