Functions of Mechanoreceptors in the Skin

p {margin: 0; padding: 0;} .ft00{font-size:31px;font-family:TimesNewRomanPS;color:#cc0000;} .ft01{font-size:17px;font-family:TimesNewRomanPS;color:#000000;} .ft02{font-size:17px;font-family:TimesNewRomanPSMT;color:#000000;} .ft03{font-size:17px;font-family:SegoeUISymbol;color:#000000;} .ft04{font-size:17px;line-height:25px;font-family:TimesNewRomanPSMT;color:#000000;} .ft05{font-size:17px;line-height:24px;font-family:TimesNewRomanPSMT;color:#000000;} .ft06{font-size:17px;line-height:23px;font-family:TimesNewRomanPSMT;color:#000000;}  Functions of Mechanoreceptors in the Skin   -Ruffini corpuscle:    ✪ Is different from the previous ones not so much by its location because also in the dermis and   hypodermis and it is common at the soles of the feet, it is an elongated structure but there is no  Schwann cell, it is actually associated with fibers of collagens and it is also surrounded by a  capsule.    ✪ Here again there is a myelinated nerve fiber which will approach the Ruffini corpuscle through its   middle part, its middle part and which will very quickly lose its myelin sheath first and then become  arborized and these numerous ramifications are located between collagen fibers therefore the  central part, this are no longer Schwann cells but they are collagen fibers more or less intertwined  with each other, more or less thick, it is these collagen fibers which form the center of the corpuscle  and which will fuse beyond with the collagen fibers of the dermis so there is a certain continuity  between the collagen fibers of the dermis and those which are densifies inside this Ruffini  corpuscle. The fiber is not dreamer and is stimulated by the movement of collagen fibers so it is  also a mechanoreceptor which has a rapid adaptation and slow response.    ✪ There are other corpuscles such as the Krause corpuscle located in the dermis with a very thin   capsule, with a myelinated afferent fiber, which ends, which loses its myelin sheath, which branches  and there is the Golgi corpuscle etc...   -Synthesis on this innervation:    ✪ Indeed, we saw different elements. The information received at the cutaneous level is multiple:   thermal, painful, fine touch, coarse touch and therefore all these structures, whether the free endings  or the different corpuscles, will make it possible to capture this information. The touch is mediated  by two types of mechanoreceptor: those which have a slow adaptation (= as long as the stimulation  lasts or almost) and those which have a rapid adaptation (= an activity at the beginning of the  stimulation then it stops very quickly even if the stimulation persists). Pain is a receptors that we  call nociceptive, therefore capable of detecting painful sensations, they are generally small nerve  fibers and there we have 3 types of receptors for pain: so-called nociceptive mechanoreceptors  which sense pain and which generally sense pain produced by sharp objects.    ✪ There are nociceptive thermoreceptors which are activated by temperatures above 45° and there   are receptors which are multi polymodal and therefore respond to all kinds of painful sensations.  Thermal sensitivity is ensured by heat receptors and cold receptors but within certain limits: cold  receptors respond optimally roughly between 10 and 30° and heat receptors.r respond to  temperatures between 35 37° and 45°, beyond this it is no longer a thermal sensitivity but it is a  painful sensitivity. All these receptors which are multiple are not in their intimate mechanisms well  known in the sense that we know that activation cellular is direct, there is no second messenger for  example therefore a latency time between the stimulus and the very weak nervous impulse of the  order of a few ms and in fact what is the receptor is the nerve fiber and the corpuscle itself is a sort  of amplifier which increases the signal but what receives the signal is the nerve fiber which is in the  center or which is arborized.