The document discusses the sensory system, emphasizing the processes of stimulus detection, transmission, and perception. It outlines the roles of grey and white matter in information processing and includes examples like pain receptors and the pupillary light reflex. It also mentions conditions affecting motor functions, such as pseudoathetosis, due to sensory disturbances.

1. Sensory System Dr. Marc Gotkine Submitted 2008 to

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4. Stimulus

5. Stimulus Response

6. Stimulus Response Consciousness HOT !!!

7. Stimulus Response Consciousness HOT !!! Expensive ! -

8. Monosynaptic reflex

9. Stimulus Consciousness Detection Transmission Perception HOT !!!

10. Stimulus Consciousness Detection Transmission Perception HOT !!!

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15. Processing Grey Matter Cell bodies & Synapses = Area of processing More processing = larger area of grey matter Stimulus Consciousness Detection Transmission Perception

16. White Matter Myelinated Axons = Transmission pathway No processing within white matter Can stop at grey-matter “stations” to process information on the way Stimulus Consciousness Detection Transmission Perception

17. Transmission

18. Processing Stimulus Consciousness Detection Transmission Perception

19. Processing עיבוד Stimulus Consciousness Detection Transmission Perception

20. Processing Stimulus Consciousness Detection Transmission Perception

21. Processing עיבוד Stimulus Consciousness Detection Transmission Perception

22. Processing Stimulus Consciousness Detection Transmission Perception

23. Processing עיבוד Stimulus Consciousness Detection Transmission Perception

27. Pacinian corpuscle Pressure Vibration

28. Meissner's corpuscle Light touch

29. Nociceptors (Pain receptors) Free nerve endings Temperature Mechanical stimuli Polymodality

33. Homonculus (point-to-point mapping)

34. Vision

41. Sphincter pupillae muscle Pathways involved in the pupillary light reflex

55. Stimulus Response Consciousness -

56. A man with abnormal hand-movements only when he looks at his hand Case

57. Pseudoathetosis http://www.asktheneurologist.com/movement-disorders-lecture.html

58. Pseudoathetosis - deciding on the basis of faulty input Due to a disturbance in the pathway which sense where the joints are in space Sensory disturbances can cause motor problems

59. THANKS