CNS mamiriro. tsinga faibha

Tsinga internet outgrowth ndiyo dzouropi, glial mumuhara zvinenge zvakazara. Nei zvichikosha? Ko? Chii chivako? Izvi uchadzidza kubva munyaya.

kupatsanura

The fibers pakati tsinga akasiyana yakarongeka. Maererano nemamiriro vanogona kuva mumwe mhando mbiri. Saka, voga unmyelinated uye myelinated fibers. Wokutanga rine kwacho muchitokisi, riri pakati chacho. It anonzi axon (axons). Izvi zviri takapoteredzwa myelin mumuhara. Akapiwa yezvakaita dzichipfekeka mutoro zvikuru, paumbwe etsinga fibers ane kupiwa mhando. The nemamiriro zvivako kunobva dhipatimendi yavanofanira dziri. Somuenzaniso, mune imwe dhipatimendi somatic tsinga akaronga myelinated tsinga fibers, uye vegetative - unmyelinated. Zvinofanira akati kuti paumbwe izvi uye zvimwe zvivako dzinotevera zvakafanana.

Sezvo pane nhete tsinga faibha?

Funga muitiro zvizere. Panguva pavaipfuura inotungamirwa pezvivako akadai unmyelinated axon delves kupinda beach rine lemmotsitov uyo tsitolemmy anotanga sag uye kufukidza muitiro panheyo coupling. Edge uyu pedyo kwechibayiro axon, uye kuumbwa duplikatury muchitokisi Kamudzira, unonzi "mezakson". Lemmotsity, yaiva musuo rinotevera, achiumbwa tichibatsirwa zvavo tsitolemmy nyore kutaura navo. Unmyelinated fibers nokuda murombo kuputira anokwanisa kupfuura tsinga zvairatidza uye mezaksona nzvimbo uye munharaunda kunyorerana pakati lemmotsitami. Somugumisiro, unopfuura kubva faibha kune mumwe.

Inotungamirwa gobvu hurongwa

Tsinga internet myelin substantially mukobvu unmyelinated mhando. Maererano muitiro nokuumba anoshongwa akafanana. Zvisinei, kuti nokukurumidza kukura Tutsinga tunofambisa mashoko utwu ari somatic dhipatimendi, riri chokuita kukura muviri wose, anotsigirwa ndichinanavira mezaksonov. Zvadaro lemmotsity nejira kumativi axons kanoverengeka. Somugumisiro, mashoko concentric akaturikidzana vari kuumbwa mufananidzo, uye chinoumba vari vakabviswa cytoplasm rokupedzisira coils, inova chokunze mumuhara kuti faibha (neurilemma). Yomukati rukoko ine mezaksona, entwined kakawanda anonzi myelin. Nokufamba kwenguva, uwandu muchichinjana uye kukura mezaksona zvishoma nezvishoma kuwedzera. Izvi imhaka kwemutemo nedanho myelination panguva axonal kukura uye lemmotsitov. Mumwe Zvakazoitwa kwezana yapfuura vakwanise. Chinonyanya rakakura ndiye rine cytoplasm kuti musimboti lemmotsita. Uyezve siyana myelin ukobvu uye pamusoro yose kureba faibha. Munzvimbo idzodzo umo lemmotsity kuonana mumwe, kuti stratification nokupera. The kuonana kupinda chete dzokunze akaturikidzana, kusanganisira cytoplasm uye musimboti. Nzvimbo dzakadaro kuumbwa nokuda kwokushaya kwavo myelin rive dete nokusanzwira nehondo mazita interceptions.

Kukura zvivako nechepakati tsinga

Myelination kunoitika munyika somugumisiro dzinotsanagura oligodendrocytes wrap axons. Myelin chinhu lipid hwaro uye pamwe oxides anowana rima. The yasara zvinoumba ari Kamudzira dzaro interstices kuramba chiedza. rinoparadza izvi zvinonzi notches kuitika myelin. Ivo dzinoenderana strata duku iri cytoplasm lemmotsita. A axon ari cytoplasm uye mitochondria neurofibrils vanosarudzirwa longitudinally. nhamba yavo chikuru - pedyo kunomisa uye pakupedzisira mano fibers. Tsitolemmy axon (axolemma) kunoita tsinga zvatinganzwa. Kunoratidza ayo sefungu depolarization. Kana apo sechinhu axial humburumbira neurite kukurukurwa, rine basophilic granules fuma.

mamiriro

Myelinated tsinga fibers ine:

1. Axon, riri pakati.
2. Myelin mumuhara. Zvinonzi akazadza humburumbira akabatana.
3. Schwann deko.

The chipo sezvamunoita axial humburumbira neurofibrils. The myelin mumuhara rinoumbwa munhu muzvizhinji kuti lipoid zvinhu dzichiumbwa myelin. Nezvenyaya iyi ine zvainoreva zvikuru nechepakati tsinga. Zvikurukuru, izvozvo anosarudza nokukurumidza panguva iyo conduction kuti excitation mune tsinga fibers. The goko akaumba remubatanidzwa axon anovhara kuitira kuti Makwanza vari kuumbwa, makatumidzwa nodes pamusoro Ranvier. In kwavo nharaunda navo humburumbira akabatana kuti Schwann mumuhara. internet chidimbu - ayo gwanza, riri pakati nodes maviri Ranvier. Inogona kunzi chinoumba ari Schwann mumuhara. Riri anenge ari pakati chidimbu. Zvinonzi dzakapoteredzwa protoplasm pamusoro Schwann masero pamwe zviri myelin muzvishwe. Pakati nodes pamusoro Ranvier myelin mumuhara hakusi homogeneous. Rine oblique notches Schmidt-Lanterman. Schwann Sero Kamudzira kutanga kukudziridza kubva ectoderm. Below kwavari chinhu axon fibers ari peripheral tsinga, kwavakazvidza vanogona kunzi ayo masero glial. Tsinga fibers nechepakati mugadziriro kuine Schwann deko. Asi, pane zvinhu oligodendroglial. Unmyelinated faibha ane chete axons uye Schwann mumuhara waro sezvamunoita.

shanda

Huru basa kuteererwa etsinga faibha - innervation. Izvi ndizvo pakubhadhara maviri: kupomba uye bezimpulsnym. Muchiitiko chokutanga, nokupfuuridzirwa kunoitika kuburikidza electrolyte uye neurotransmitter zvigadziriswe. The innervation kukonzera myelin, saka kumhanya acho zviri yepamusoro myelinated fibers kupfuura unmyelinated. Process bezimpulsnogo mhando kunoitika axoplasm razvino inoyerera panguva inokosha axonal microtubules, izvo vanoumba trofogeny (zvinhu kuti vane trophic migumisiro).