BIOL 121 Lecture Notes - Lecture 19: Transient Receptor Potential Channel, Parietal Lobe, Proprioception
Document Summary
Arise from a variety of mechanoreceptors in the skin. Mechanical deformation leads to opening of ion channels. Most afferent neurons are larch and myelinated (fast conduction velocity) Areas requiring fine sensation (fingertips and mouth) have small receptive fields, high receptive field density, and a large corresponding area of cortex. Sensory receptors: muscle spindles, golgi tendon organs, and skin stretch receptors. Somatic sensation arises from sensory receptors located in skin, muscles, bones, tendons, and joints. Different types of receptors lead to sensations of. Sensed by afferent neurons with transient receptor potential proteins (trp) Trp proteins are ion channels that open within a certain temperature range. Some chemicals can cause the ion channels to open as well even though there is no change in temperature. Afferent neurons have small axons that are unmyelinated. Comes through nocieceptors- which can respond to mechanical stimuli, temperature, and chemicals as long as the stimuli is potentially injurious.
