![]() Other receptors are located inside the body, such as the baroceptors in the blood vessels. Mechanoreceptors, on the other hand, are located in muscle spindles, enabling them to detect muscle stretch. ![]() These include nociceptors and thermoreceptors. ![]() Sensory receptors located in the dermis or epidermis of the skin are called cutaneous receptors. The types of sensory receptors according to location include cutaneous receptors and mechanoreceptors. Encapsulated receptors such as Meissner's and Pacinian corpuscles are protected by layered connective tissue. no myelinated sheath or protection, thus they are bare). Free nerve endings such as thermoreceptors and nociceptors have unmyelinated terminal neuronal branches (i.e. Sensory receptors that are classified according to morpohology or form are usually divided into two main groups: free nerve endings and encapsulated receptors. Sensory receptors that are classified according to their adequate stimulus include the following: Sensory ReceptorĪdequate Stimulus (sensory receptor responds to…)ĭamage to body tissues (which leads to pain perception) In short, adequate stimulus is the ability of a sensory receptor to determine the stimulus modality. By Adequate StimulusĪdequate stimulus refers to the property of a sensory receptor that describes the type of energy to which the sensory receptor reacts to. Because there are different stimulus modalities, sensory receptors also vary in terms of adequate stimulus, morphology, and location. Stimulus modality is defined as an aspect of a stimulus that could be light, sound, taste, temperature, smell, pressure, etc. Without these sensory receptors, both sensation and perception cannot occur. Photoreceptors of the eye contain rhodopsin and other proteins that transduce or transform light energy into electrical impulses. Cornea1 epithelial tissue is transparent and innervated exclu- sively by A6 and C fibers which terminate as free nerve endings. Some receptors have been or will be described in. Other sensory receptors function by means of transduction. Free nerve endings: These are the most abundant type of sensory endings, occurring widely in the integument and within muscles, joints, viscera, and other structures. Morphologically, receptors are grouped as having free or naked nerve endings or encapsulated nerve endings. For instance, the chemicals in food interaction with the taste receptors of the taste bud so that an action potential or a nerve signal can be created. Taste or gustatory receptors, odor or olfactory receptors have receptor molecules which undergo a process of binding to chemicals in the stimuli. (unencapsulated) Merkel- tonic receptors for light touch, sensing textures, edges and shapes. ![]() For the purposes of this article, mechanoreceptor refers to the mechanosensory end-organ structure and its associated low-threshold mechanoreceptor (LTMR). In a sensory system, sensory receptors serve as the front-liners because they are in contact with the stimulus. (unencapsulated) bare dendrites that have no special association with specific accessory cells or tissues. Different receptor types and free nerve endings, each with their own specific function, generate the overall sense of touch, position in space, and pain. ![]()
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