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SENSORY PHYSIOLOGY

SENSORY PHYSIOLOGY. BIOLOGY 305 LABORATORY. ANNOUNCEMENTS. Lab Practical is NEXT Week! Check course web site for schedule of open lab hours. LAB PRACTICAL. Be Sure YOU Know:. LAB PRACTICAL. How You Loose Points:. THIS WEEK: REACTION TIMES. Investigation of Reaction Times:

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SENSORY PHYSIOLOGY

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  1. SENSORY PHYSIOLOGY BIOLOGY 305 LABORATORY

  2. ANNOUNCEMENTS • Lab Practical is NEXT Week! • Check course web site for schedule of open lab hours

  3. LAB PRACTICAL • Be Sure YOU Know:

  4. LAB PRACTICAL • How You Loose Points:

  5. THIS WEEK: REACTION TIMES Investigation of Reaction Times: • Audio Stimuli • Visual Stimuli Investigation of Myotactic Reflex

  6. THIS WEEK: REACTION TIMES Investigation of Reaction Times: • Auditory stimulus takes approx. visual stimulus takes approx. • Influences:

  7. THIS WEEK: REFLEXES Reflexes: • Stereotypical, rapid motor response • Do not require input from brain

  8. NEXT WEEK: THE CRAYFISH STRETCH RECEPTOR CRAYFISH: • Invertebrate • Also includes: crab, lobster, shrimp • Scientific name: • Largely aquatic • Characteristics include:

  9. NEXT WEEK: THE CRAYFISH STRETCH RECEPTOR The Neuron: • Excitable cell • Basic unit of communication in nearly all nervous systems Neuron Anatomy: • Dendrites • Cell body • Axon

  10. THE CRAYFISH STRETCH RECEPTOR Crayfish Nervous System: • Bilateral Symmetry • Segmented Arrangement: • Each body segment contains ganglion • Axons carry info between ganglia • Nerves branch off ganglia to periphery • Contain sensory + motor neurons

  11. THE CRAYFISH STRETCH RECEPTOR Purpose of Exercise: • Experience classic neurophys. prep. • Investigate stimulus-response properties of crayfish nervous system • Observe characteristics of a sensory system: • Differentiate responses from two types of sensory organs

  12. THE CRAYFISH STRETCH RECEPTOR Muscle Receptor Organs (MROs): • Two types: • Composed of

  13. THE CRAYFISH STRETCH RECEPTOR Superficial Extensor Muscle: • Two per abdominal segment • Each contains 2 MRO neurons

  14. THE CRAYFISH STRETCH RECEPTOR When Abdomen of Crayfish Bends:

  15. THE CRAYFISH STRETCH RECEPTOR Signaling: • Electrical signals aregenerated by

  16. THE CRAYFISH STRETCH RECEPTOR For This Exercise: • We’ll record extracellularly from a nerve that carries sensory info from MROs to CNS • Accomplished by curling crayfish tail to stimulate sensory neurons

  17. THE CRAYFISH STRETCH RECEPTOR Major Instruments:

  18. THE CRAYFISH STRETCH RECEPTOR Exercises: • Stimulus Intensity • Adaptation • Tapping Experiment

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