MCELLBI C61 Lecture Notes - Lecture 20: Visual Cortex, Brain Mapping, Brainstem

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Skin contains multiple receptors that allow for the perception of touch. Free nerve endings respond to changes in pressure + temperature. Detector structures responding to temperature, pressure, painfully intense stimulation, are all connected via nerve bers to clusters of neurons that area located along the spinal cord, called the dorsal route ganglia. Its these clusters that have bidirectional axons (bipolar neurons) Dendrites transmit signals from sensory structures of the skin + are continuous with the axon that carries the signal to the spinal cord and into the brain stem. From there, it goes through a series of steps into the somatosensory map of the visual cortex, which responds to di erent sensory stimuli. Receptive eld: the part of the skin in contact with a stimulus will activate a particular neuron in the somatosensory cortex. Postcentral gyrus is the primary somatosensory cortex (s1), which is the rst to receives signals from the somatosensory receptors.

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