Flashcards
Physiology - Sensory Pathways - CNS
Flashcards do conjunto (13)
- 1What are the components of the Sensory Pathway?- Receptors
- Stimulus - 2What are the different sensory receptors?- Thermoreceptor
- Mechanoreceptor
-Chemoreceptors
- Photoreceptors
- Nociceptors - 3What 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. - 4What is a receptive field?An area around a receptor where a stimulus is detected.
*Large receptive fields are less precise than small ones* - 5What is a labelled line?A specific sensory pathway for a specific receptor and sense.
- 6What is lateral Inhibition?The process by which secondary and tertiary neurons are switched off to pinpoint where a sense is being felt.
- 7What 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. - 8What stimulus properties can affect receptors?- Modality (labelled line)
- Location (lateral inhibition)
- Intensity & Duration (adaption) - 9What are the 2 main areas in sensory pathways that detect somatic senses?- Primary Sensory Areas (parietal lobe)
- Association Areas ( cerebral cortex) - 10What are the three sensory pathways?- Posterior Column Pathway (fine)
- Spinocerebellar Pathway
- Spinothalamic Pathway (crude, pain) - 11What are the 3 types of pain receptors?Mechanical - cutting, pinching
Thermal - temp
Polymodal - chemical - 12What are the 2 forms of pain?Fast - mylienated, mechanical & thermal, a-delta fibers, sharp and fast.
Slow- unmylienated, polymodal, c fibers, throbbing pain. - 13What 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.
Informações
- Descrição
- Bachelors Degree Physiology FlashCards sobre Physiology - Sensory Pathways - CNS, criado por Riki M em 20-03-2016.
- Criado por
- Riki M · mar 2016
- Atualizado
- 15 fev 2017
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