PSY290H1 Lecture Notes - Lecture 5: Brainstem, Reticular Formation, Aspirin

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12 Oct 2012
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Lecture 5
Oct 9, PSY290
Touch Pain Taste and Smell
Pathways from skin to brain
Cutaneous sensations
Touch and Pain
Cutaneous Receptors
Meissner’s Corp.: Small fields, Fast adapting
Good at locating things
Merkel’s Disk: Small fields, slowly adapting
Pacinian Corp.: Large fields, fast adapting
Deep vibration
Ruffini Ending: Large fields, slowly adapting
Deep tugging, gripping (slow adapting to make sure you know you’re still hanging
on)
Free nerve ending: Pain and temperature
Hair Ending: Sensitive to breezes and touch
Fast- and Slow-adapting receptors
There are receptors that are fast-adapting and only respond to a change, i.e. if
someone sits on your lap, it would fire when they sit and when they get up
On the other hand, slow-adapting would fire the entire time that the person sits on
you
Pathways for inhibition of pain
Analgesia and Opiates
Pathways from internal organs to brain
Visceral sensations
Taste
Pathways from outer world to brain
Olfaction
The Telencephalon
Other Subcortical Systems
Startle Reflex
Sound Localisation
Head Turns and Balance
Dermatomes
Cervical (back of head, neck, shoulders, arms
Thoractic
Sacral Lumbar
Nerves
Trigeminal V (two sensory branches, not 3 in the face)
Cervical 1-8 (C1-C8)
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