I-Pacini Corpuscle: Zeziphi ezi zinto Zamkelayo kwaye Zisebenza Njani

Umxholo

• Uhlobo lwe-mechanoreceptor olusasazwa kulusu nakwizitho ezahlukeneyo zangaphakathi.
• Zithini iipacuscle?
• Badlala eyiphi indima?
• Baphi na kwaye banjani?
• Indlela yokusebenza

Uhlobo lwe-mechanoreceptor olusasazwa kulusu nakwizitho ezahlukeneyo zangaphakathi.

Iimpawu zePacini lolunye lweendidi ezine zoomatshini abenza ukuba imeko yokuthinta, ebantwini nakwezinye iintlobo zezilwanyana ezanyisayo.

Enkosi kwezi seli sinokubona uxinzelelo kunye neentshukumo kulusu lwethu, zibaluleke kakhulu xa sibona izoyikiso ezibonakalayo ezinokubakho nakwimihla ngemihla njengokuthatha izinto kwindalo esingqongileyo.

Kungabonakala ngathi bebancinci kakhulu ukuba bangazinikeli okuninzi, nangona kunjalo, i-neuroscience ibhekise kubo ngokucokisekileyo, kuba zibalulekile ekuziphatheni nasekusindeni kwethu, oko kukuthi, ngokwembono yePsychology kunye neBiology. Makhe sibone ukuba zeziphi izinto ezincinci esizenzayo kwilungu lethu elikhulu, ulusu.

Zithini iipacuscle?

Ngaphandle koluvo olulula lokuba abantu baneemvakalelo ezintlanu, kukho inyani: kukho iindlela ezahlukeneyo zovakalelo ezisazisa ngento eyenzekayo kokubini okusingqongileyo nasemizimbeni yethu. Ngokwesiqhelo, phantsi kwelebheli "thinta" uninzi lwazo lubekwe ngokwamaqela, ezinye zazo ziyakwazi ukuvelisa amava ahlukileyo kakhulu omnye komnye.

I-Pacini corpuscles, ebizwa ngokuba yi-lamellar corpuscles, zi Olunye lweendidi ezine zoomatshini bokwenza umsebenzi ophethe imvakalelo yokuthinta, efumaneka kulusu lomntu. Zijonge ikakhulu kuxinzelelo kunye nokunyikima okunokwenzeka kulusu, nokuba kungokuchukumisa into okanye isenzo sentshukumo ethile yomntu. Ezi seli zithiywa ngegama lomfumanisi wazo, ingcali ye-anatomist yase-Italiya uFilippo Pacini.

Ezi zidumbu, nangona zifumaneka kulusu lonke, zifunyanwa kakhulu kwiindawo apho iinwele zingafumanekiyo, njengezintende zezandla, iminwe kunye neentende zeenyawo. Banesakhono esikhawulezileyo sokuziqhelanisa nezinto ezikhuthazayo zomzimba, ezivumela umqondiso okhawulezileyo ukuba uthunyelwe kwinkqubo ye-luvo kodwa ngokuthe ngcembe uncipha njengoko isikhuthazi siqhubeka nokunxibelelana nolusu.

Enkosi kolu hlobo lweeseli, abantu banako qaphela imiba ephathekayo yomzimba yezinto ezifana noburhabaxa bomhlaba, uburhabaxa, ukongeza ekusebenziseni amandla afanelekileyo ngokusekwe ekubeni sifuna ukubamba okanye ukukhupha into ekubhekiswa kuyo.

Badlala eyiphi indima?

I-Lamellar okanye i-Pacini corpuscle ziiseli eziphendula kwizikhuthazo zemvakalelo kunye notshintsho olukhawulezileyo olunokwenzeka kuyo. Kungenxa yoko le nto umsebenzi wayo ophambili kukufumana ukungcangcazela eluswini, ukongeza kutshintsho kuxinzelelo olunokufunyanwa sesi sifo.

Xa kukho deformation okanye intshukumo eshukumayo eluswini, ii-corpuscle zikhupha isenzo esinokubakho kwisiphelo se-nerve, ngaloo ndlela sithumele umqondiso kwinkqubo ye-nervous ephela ifikelela kwingqondo.

Ndiyabulela kuvakalelo lwabo olukhulu, ezi zinto zidibeneyo unokubona ukungcangcazela kwamaxesha okusondela kwi-250 hertz (Hz). Oku, ngenxa yokuqonda, kuthetha ukuba ulusu lomntu luyakwazi ukubona intshukumo yamasuntswana asondele kwimicron enye (1 μm) ngokobukhulu eminwe yakho. Nangona kunjalo, olunye uphononongo lubonakalisile ukuba luyakwazi ukwenziwa lusebenze ukungcangcazela kumanqanaba angama-30 ukuya kwi-100 Hz.

Baphi na kwaye banjani?

Ulwakhiwo, imizimba yePacini ubume okweqanda, ngamanye amaxesha ufana kakhulu nowesilinda. Ubungakanani bayo bujikeleze i-millimeter ubude ngaphezulu okanye ngaphantsi.

Ezi seli zenziwe ngamashiti aliqela, abizwa ngokuba yi lamellae, kwaye kungenxa yesi sizathu sokuba elinye igama labo libe yimellell corpuscle. Ezi zahlulo zingaba phakathi kwama-20 nama-60, kwaye zenziwe ngee-fibroblast, uhlobo lweseli edibeneyo, kunye nezicubu ezinemicu edibeneyo. I-lamellae ayinanxibelelwano ngqo ngqo, kodwa yahlulwe ngamanqanaba acekeceke kakhulu e-collagen, enokungqinelana kwe-gelatin kunye nepesenti ephezulu yamanzi.

A ifayibha yentsimbi ekhuselwe yi-myelin ingena kwinxalenye esezantsi yesidumbu, efikelela kumbindi weseli, iya isiba butyeba kwaye idyelini njengoko ingena emzimbeni. Ukongeza, imithambo yegazi eliqela nayo ingena kule ndawo ingezantsi, ethi ingene kumacandelo ahlukeneyo e-lamellar enza i-mechanoreceptor.

Iimpawu zePacini zibekwe kwihypodermis yomzimba wonke. Olu luhlu lolusu lufumaneka kwezona ndawo zinzulu zethishu, nangona kunjalo inee-concentrate ezahlukeneyo ze-lamellar corpuscle ngokuxhomekeke kwindawo yomzimba.

Nangona zinokufumaneka kulusu olunoboya kunye nolukhazimlayo, oko kukuthi, ulusu olungenalo uboya, zininzi kakhulu kwiindawo ezingenaboya, ezinjengeentende zezandla neenyawo. Inyaniso, malunga ne-350 corpuscle inokufunyanwa kumnwe ngamnye wezandla, kwaye malunga nama-800 ezintendeni.

Ngaphandle koku, xa kuthelekiswa nezinye iintlobo zeeseli zemithambo-luvo ezinxulumene nemvakalelo yokuthinta, iiseli zePacini zifunyenwe kwinxalenye esezantsi. Kufuneka kwakhona ukuba ezinye iintlobo ezintathu zeeseli zokuchukumisa, oko kukuthi, ezo zikaMeissner, Merkel kunye neRuffini zincinci kunezo zePacini.

Kuyathakazelisa ukukhankanya into yokuba imizimba yePacini ayinakufumaneka kuphela kulusu lomntu, kodwa nakwezinye izakhiwo zangaphakathi zomzimba. Iiseli zeLamellar zifumaneka kwiindawo ezahlukeneyo njenge Isibindi, amalungu ezesondo, i-pancreas, i-periosteum kunye ne-mesentery. Kucingelwe ukuba ezi seli ziya kuba nomsebenzi wokubhaqa ukungcangcazela koomatshini ngenxa yokuhamba kula malungu athile, ukufumana izandi ezihamba rhoqo.

Indlela yokusebenza

Iikhampasi zikaPacini ziphendula ngokukhupha imiqondiso kwinkqubo yemithambo-luvo xa i-lamellae yazo ikhubazekile. Olu deformation lubangela zombini deformation kunye noxinzelelo kwi-membrane yeseli yesiphelo sendlela yokuvela. Kwelinye icala, le inwebu ikhubazekile okanye igobile, kwaye kungoko ke kuthunyelwa isignali ye-nerve kwizakhiwo zemithambo-luvo, zombini umnqonqo kunye nengqondo.

Lo mqondiso unenkcazo ye-electrochemical. Njengombilini wecytoplasmic we-neuron deforms, imijelo yesodium, enovakalelo loxinzelelo, ivulekile. Ngale ndlela, ion ion (Na +) ikhutshwa kwindawo ye-synaptic, ibangela ukuba inwebu yeseli idodobalise kwaye ivelise isenzo esinokubakho, nto leyo enika amandla kwimpembelelo ye-nerve.

Iimpawu zikaPayini Phendula ngokwenqanaba loxinzelelo olwenziwe kulusu. Oko kukuthi, uxinzelelo ngakumbi, ngakumbi iimpawu zemithambo-luvo zithunyelwa. Kungenxa yesi sizathu ukuba sikwazi ukubona phakathi kokuthamba okuthambileyo kunye nokucinezela okunokusenzakalisa.

Nangona kunjalo, ikwakhona enye into enokubonakala ngathi iyaphikisana nale nyaniso, kwaye yile yokuba ekubeni bezizamkeli zokuziqhelanisa nokukhawulezisa ukukhuthaza, emva kwexesha elifutshane baqala ukuthumela imiqondiso embalwa kwinkqubo ye-nervous system. Ngesi sizathu, kwaye emva kwexesha elifutshane, ukuba siyayichukumisa into, inqaku liyafika apho ukuchukumisa kwayo kuya kungazi nto; olo lwazi alusasebenzi kangako, emva komzuzu wokuqala apho siyazi ukuba inyani ebonakalayo evelisa olo luvo ikhona kwaye iyasichaphazela rhoqo.