BIOL 2410 Lecture Notes - Lecture 20: Phantom Limb, Sensory Neuron, Cranial Nerves
23 Nov 2016
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Document Summary
Sensory information is sent to the spinal cord and up toward the brain in ascending tracts. Some visceral re exes generate automatic responses and never reach the brain for conscious awareness. All incoming sensory information rst goes to the thalamus before reaching the nal destination in the cerebrum. Some visceral information heads directly to the brainstem via cranial nerves rather than stopping at the thalamus. Olfactory (smell) information does not pass through the thalamus. Moves from the nose -> cranial nerve #1 -> olfactory cortex of the cerebrum (above eye) Perception threshold: minimum stimulus intensity needed for you to be aware of the sensation. Anything that doesn"t meet this threshold will not send a signal to the brain. In order to differentiate between many different types of incoming stimuli four different properties of the stimulus must be determined: modality. Which sensory neurons are stimulated and where they terminate in the brain.
