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| Question | Answer |
| What are the components of the Sensory Pathway? | - Receptors - Stimulus |
| What are the different sensory receptors? | - Thermoreceptor - Mechanoreceptor -Chemoreceptors - Photoreceptors - Nociceptors |
| What are the steps in Sensory Transduction? | - A stimulus activates a receptor - A threshold point is reached - Depolarisation of the receptor memebrane occurs (receptor potential) - This results in an Action Potential _ Neurotransmitters act on sensory neurons. |
| What is a receptive field? | An area around a receptor where a stimulus is detected. *Large receptive fields are less precise than small ones* |
| What is a labelled line? | A specific sensory pathway for a specific receptor and sense. |
| What is lateral Inhibition? | The process by which secondary and tertiary neurons are switched off to pinpoint where a sense is being felt. |
| What is Adaption? | The ability of a receptor to change it's response to a stimulus. *2 types of receptors - Tonic & Phasic - Phasic is fast firing, turns off. |
| What stimulus properties can affect receptors? | - Modality (labelled line) - Location (lateral inhibition) - Intensity & Duration (adaption) |
| What are the 2 main areas in sensory pathways that detect somatic senses? | - Primary Sensory Areas (parietal lobe) - Association Areas ( cerebral cortex) |
| What are the three sensory pathways? | - Posterior Column Pathway (fine) - Spinocerebellar Pathway - Spinothalamic Pathway (crude, pain) |
| What are the 3 types of pain receptors? | Mechanical - cutting, pinching Thermal - temp Polymodal - chemical |
| What are the 2 forms of pain? | Fast - mylienated, mechanical & thermal, a-delta fibers, sharp and fast. Slow- unmylienated, polymodal, c fibers, throbbing pain. |
| What are the steps involved in the Spinothalamic Pathway? | - First order neuron enters SC via dorsal horn - Synapses onto second order neuron in dorsal horn - Axon crosses the midline & ascends into thalamus - Here it synapses onto third order neuron which ascends to somatic cortex. |
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