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Lecture 12

Lecture 12 - Sensing The Environment

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University of Toronto Scarborough
Biological Sciences
Kenneth Welch

Lecture 12 Chapter 7 Sensing the Environment Section General Properties of Sensory Reception P. 216 230. Section Mechanoreception Introduction through Insect Mechanoreceptors P. 238 240. Sensory receptors Each category of sensation is called a sensory modality The features that characterize stimuli within a particular modality are qualities Interoceptive (internal) receptors respond to signals from within the body and communicate this information to the brain by pathways that typically are not brought into consciousness Proprioceptors monitor the positions of muscles and joints and other interoceptive receptors monitor the chemical and thermal state of the body and its orientation 3 types 2 are neurons = A and B Where the neuron body is difference between A and B Spike initiation zone sits on one side of the soma rather than the other difference between A and B In invertebrate sensory neurons using A B = Long projection of dendrites etc. in verts. Touch receptors in B C: the receptor cell itself is not a neuron o Chemical synapse o When receptor current is generated, this results in synaptic vesicle release, then inhibition of post synaptic membrane o Ex. A taste receptor is involved in sensory info but is NOT a neuron Molecular mechanism
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