Ascending Spinal Pathways Flashcards
anatomical types of receptors
free nerve endings - painencapsulated - touch, mechanicalspecial neural receptor cells - special/chemical senses
functional types of receptors
mechanoreceptorsnociceptorsphotoreceptorschemoreceptorsthermoreceptors
adequate stimulus
most appropriate stimulus that will allow receptor to pass current
modality
the sense it carriesex/ stimulus = lightmodality = vision
receptor potential
proportional to strength of stimulus-graded potentialat threshold - primary afferent produces action potential
pre-cenral gyrus
primary motor cortex
post-central gyrus
primary somatosensory cortex
brodmans areas post central gyrus?
3, 1, 2 somatosensory
brodmans area for pre-central gyrus?
4motor
targets for somatosensation
reflex arcreticular formationhypothlamus > limbic systemthalamus > cerebral cortexcerebellum**divergence of neurosystem
labeled line code
if you stimulate this tract-modality of this tract results in certain sensation being feltcodes modality
population code
as intensity increases number of receptors activated increased
frequency code
as intensity increases - rate of APs increases
receptor field
part of environment to which neuron responds
resolution
ability to distinguish between 2 separate stimuluslow density - large receptive field - less resolution-few number of neurons in cortexhigh density - small receptive field - more resolution-larger number of neurons in cortex
large receptive field
lower density lower resolutionfewer number of neurons in cortex
