![]() ![]() Free nerve endings are sensitive to painful stimuli, to hot and cold, and to light touch. Free nerve endings, and encapsulated endings such as Pacinian corpuscles, have been demonstrated in the bladder wall. A free nerve ending is an unencapsulated dendrite of a sensory neuron they are the most common nerve endings in skin. Therefore, the correct answer is option D. Mechanoreceptors in the skin are described as encapsulated or unencapsulated. They are made up of branched termini of sensory fibers. Zabusov and Maslov (1961) distinguished three categories. Microscopic examination of the skin reveals a variety of nerve terminals including free nerve endings (which are most common), Ruffini endings, and encapsulated endings, such Pacinian corpuscles, Meissner’s corpuscles, and Krause end bulbs. Free nerve endings are sensitive to painful stimuli, to hot and cold, and to light touch. Free nerve endings Free nerve endings are the most copious mechanoreceptors found in the epidermis. Stilwell (1957) described free endings in joint capsules, Ruffini endings and encapsulated endings. ![]() A free nerve ending is an unencapsulated dendrite of a sensory neuron they are the most common nerve endings in the skin. The sensitivity of free nerve endings is high in comparison to the covered nerve endings. They are most commonly present in the skin and extend to the middle portion of the epidermis. Furthermore, they are encapsulated free nerve endings. There are four primary tactile mechanoreceptors in human skin: Merkel's disks, Meissner's corpuscles, Ruffini endings, and Pacinian corpuscle two are located toward the surface of the skin and two are located deeper. Merkel's disks are slow-adapting, unencapsulated nerve endings, which respond to light touch. Meissner's corpuscles respond to fine touch and pressure, but they also respond to low-frequency vibration or flutter. Pacinian corpuscles are rapidly adapting mechanoreceptors that sense deep, transient (not prolonged) pressure, and high-frequency vibration. Meissner's and Pacinian corpuscles are both encapsulated receptor types, surrounded by concentric layers of a specialized connective tissue. Ruffini endings are slow-adapting, encapsulated mechanoreceptors that detect skin stretch and deformations within joints. Free nerve endings are the nerve endings that have no complex sensory structures. Baroreceptors: They are free nerve endings located in the carotid sinuses and aortic. There are three classes of mechanoreceptors tactile, proprioceptors, and baroreceptors. Pacinian corpuscles: They are most rapidly adapting, encapsulated. ![]()
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