Pacini Corpuscles: Ndeapi Aya Anogamuchira Uye Anoshanda Sei

Zvemukati

• Rudzi rwema mechanoreceptor rwunogoverwa mukati meganda uye dzakasiyana nhengo dzemukati.
• Chii chinonzi Pacini corpuscle?
• Vanoita basa rei?
• Varipi uye vakaita sei?
• Nzira yekuita

Rudzi rwema mechanoreceptor rwunogoverwa mukati meganda uye dzakasiyana nhengo dzemukati.

Pacini makomisheni ndeimwe yemhando ina dze ma mechanoreceptors anotendera iyo pfungwa yekubata, zvese muvanhu uye mune mamwe mammalian marudzi.

Kutenda kumaseru aya tinokwanisa kuona kumanikidza uye kudengenyeka paganda redu, kuve kwakakosha kwazvo patinoona zvese zvinogona kutyisidzirwa panyama uye muzvinhu sezuva nezuva sekutora zvinhu kubva kunharaunda.

Zvinogona kutaridzika kunge kuve vadiki zvakanyanya ivo havapi zvakawanda zvavo, zvisinei, neuroscience yakavataurira zvakanyatsonaka, sezvo ivo vari akakosha zvese mumaitiro edu uye mukupona kwedu, ndiko kuti, kubva pakuona kwePsychology neBiology. Ngatione kuti zvimiro zvidiki izvi izvo isu tese tinoita muchikamu chedu chikuru, ganda.

Chii chinonzi Pacini corpuscle?

Kunze kwepfungwa yakapusa yekuti vanhu vane njere shanu, pane chokwadi: pane nzira dzakasiyana siyana dzinotizivisa nezve zviri kuitika munharaunda medu nemumuviri wedu. Kazhinji, pasi pechiratidzo che "bata" akati wandei acho akaiswa mumapoka, mamwe acho anokwanisa kuburitsa zviitiko zvakasiyana kubva kune mumwe nemumwe.

Pacini corpuscles, inonziwo lamellar corpuscle, iri imwe yemhando ina dzema mechanoreceptors anotarisira pfungwa yekubata, inowanikwa muganda revanhu. Ivo vanonyanya kutarisana nekumanikidza uye kudedera kunogona kuitika paganda, kungave nekubata chinhu kana nekuita kwekumwe kufamba kwemunhu. Aya maseru anotumidzwa zita mushure mekuwana kwavo, wechiItaly anatomist Filippo Pacini.

Aya ma corpuscle, kunyangwe achiwanikwa mukati meganda rose, anowanikwa zvakanyanya munzvimbo dzisingawanikwe bvudzi, senge zvanza zvemaoko, zvigunwe uye tsoka dzetsoka. Ivo vane kugona kwakanyanya kukurumidza kuchinjika kune zvinokanganisa muviri, zvichibvumira chiratidzo chinokurumidza kutumirwa kune hunyanzvi asi zvichiderera zvishoma nezvishoma sezvo kukurudzira kuri kuramba kuchisangana neganda.

Nekuda kwerudzi urwu rwemaseru, vanhu vanogona ona zvinoonekwa pazvinhu zvakaita sekushongedzwa kwechiso, kuomarara, pamusoro pekushandisa simba rakakodzera zvichibva nekuti tinoda kubata kana kusunungura chinhu chiri kutaurwa.

Vanoita basa rei?

Lamellar kana Pacini makomisheni ndiwo maseru anopindura kune zvinokonzeresa zvekunzwa uye nekukasika shanduko dzinogona kuitika mariri. Ndokusaka basa rayo guru riri rekuona kudedera muganda, kuwedzera pane shanduko mukumanikidza kunogona kugamuchirwa nemucheka uyu.

Kana paine deformation kana kubvunda kufamba mukati meganda, iwo ma corpuscle anoburitsa chiito chinogona mune yekupedzisira tsinga, nokudaro kutumira chiratidzo kunenjodzi system iyo inoguma yasvika kuuropi.

Kutenda kunzwisisiro yavo huru, aya maumboni inogona kuona kudengenyeka kwehuwandu hwepedyo pedyo ne250 hertz (Hz). Izvi, nekuda kwekunzwisisa, zvinoreva kuti ganda remunhu rinokwanisa kuona kufamba kwezvimedu padhuze nechero micron (1 μm) pakukura paminwe. Nekudaro, zvimwe zvidzidzo zvakaratidza kuti ivo vanokwanisa kumisikidzwa nekudedera mumatanho e30 kusvika 100 Hz.

Varipi uye vakaita sei?

Nechimiro, iwo maumbirwo ePacini vane chimiro chedenderedzwa, dzimwe nguva chakafanana chaizvo neicho chesirinda. Kukura kwayo kwakatenderedza millimeter pakureba zvakanyanya kana zvishoma.

Aya maseru akagadzirwa nemashizha akati wandei, anonziwo lamellae, uye iri chikonzero ichi kuti rimwe zita ravo ndere lamellar corpuscle. Aya marara anogona kunge ari pakati pemakumi maviri nemakumi matanhatu, uye akaumbwa nefibroblasts, rudzi rwechisungo chinobatanidza, uye tambo inobatana ine fibrous. Iwo lamellae haana hukama hwakanangana, asi akapatsanurwa nematete akatetepa e collagen, ine gelatinous kuenderana uye yakakwira muzana muzana yemvura.

A nerve fiber yakachengetedzwa ne myelin inopinda muchikamu chezasi chechitunha, icho chinosvika pakati penhare yesero, chichiva chakakora uye chinodonhedza demoni painopinda mumuviri. Uye zvakare, tsinga dzinoverengeka dzeropa dzinopindawo nepachikamu chepasi ichi, icho chinopinda mumatanho akasiyana emamarararar anoumba mechanoreceptor.

Pacini makomisheni inowanikwa mu hypodermis yemuviri wese. Iyi nhete yeganda inowanikwa munzvimbo yakadzika kwazvo yenyama, zvisinei iine kuwanda kwakasiyana kwema lamellar corpuscle zvinoenderana nenzvimbo yemuviri.

Kunyangwe ivo vachigona kuwanikwa mune ese ane mvere uye ane glabrous ganda, ndokuti, ganda risina bvudzi, ivo vakawandisa munzvimbo dzisina mvere, senge zvanza zvemaoko nemakumbo. Saizvozvo, anenge mazana matatu emakondohwe anogona kuwanikwa pamunwe mumwe nemaoko, uye dzinenge mazana matanhatu pamaoko.

Kunyangwe izvi, kana tichienzanisa nemamwe marudzi emaseru anonzwika ane hukama nepfungwa yekubata, masero ePacini anowanikwa mune yakaderera chikamu. Izvo zvinofanirwa zvakare kutaurwa kuti mamwe matatu marudzi ekubata maseru, ndokuti, iwo aMeissner, Merkel naRuffini madiki pane ayo ePacini.

Zvinonakidza kutaura nezvekuti Pacini zvitunha hazvigone kuwanikwa chete paganda remunhu, asiwo mune zvimwe zvivakwa zvemukati zvemuviri. Masero eLamellar anowanikwa munzvimbo dzakasiyana dzakadai chiropa, nhengo dzepabonde, rwatata, periosteum, uye mesentery. Izvo zvakafungidzirwa kuti aya maseru angave aine basa rekutarisa mekutetemera kwemakanika nekuda kwekufamba mune izvi zvakasarudzika nhengo, kuona yakaderera frequency ruzha.

Nzira yekuita

Pacini's masumbu anopindura nekuburitsa maseru kune yetsinga system kana yavo lamellae yakaremara. Iyi deformation inokonzeresa zvese kushanduka uye kumanikidza kune sero membrane yeiyo sensory terminal kuti iitike. Nekudaro, iyi membrane inokamhina kana kukombama, uye ipapo ndipo panotumirwa tsinga yetsinga kunzvimbo dzepakati dzetsinga, tese musana pamwe nehuropi.

Ichi chiratidzo chine tsananguro yemagetsi. Sezvo cytoplasmic membrane yeiyo sensory neuron deforms, iyo sodium chiteshi, ayo ari ekumanikidza anonzwika, akavhurika. Nenzira iyi, sodium ions (Na +) inoburitswa muiyo synaptic nzvimbo, ichikonzera iyo membrane yesero kudzikisira uye nekugadzira iyo inogona kuita, zvichikonzera kusagadzikana kwetsinga.

Pacini ma corpuscle pindura zvinoenderana nekumanikidza kunoitwa paganda. Ndokunge, kuwanda kwekumanikidza, kuwanda kwetsinga kunotumirwa. Ndicho chikonzero ichi kuti isu tinokwanisa kusiyanisa pakati pekapfava uye kakapfava cress uye kusvina iyo inogona kutotikuvadza.

Nekudaro, kune zvekare chimwe chiitiko chingaite senge chakapesana neichi chokwadi, uye ndizvozvo sezvo ivo vari ma receptors ekukurumidza kuchinjisa kune zvinokonzeresa, mushure menguva diki vanotanga kutumira mashoma masaini kune epakati tsinga system. Neichi chikonzero, uye mushure menguva pfupi yenguva, kana tiri kubata chinhu, iyo poindi inosvika pane iyo kubata kwayo kunova kushoma kuziva; Ruzivo irworwo haruchina basa zvakadaro, mushure menguva yekutanga iyo yatinoziva kuti iyo chaiyo yezvinhu inoburitsa iyo manzwiro iripo uye inotibata nguva dzose.