Video: Hom paj ntaub twg kis mob impulses?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Ib fibers nqa txias, siab, thiab mob mob cov cim, thiab vim tias lawv nyias (2 txog 5 Μm txoj kab uas hla) thiab myelinated, lawv xa kev xav sai dua unmyelinated C. fibers , tab sis qeeb dua li lwm qhov, ntau dua myelinated pawg A cov paj hlwb . Lawv qhov kev coj ua nrawm yog qhov nruab nrab.
Xav txog qhov no, cov paj hlwb uas xa qhov mob mus rau hauv nruab nrab lub paj hlwb?
Cov pab pawg C muaj xws li cov xov tooj cua tom qab lub zog hauv lub cev tsis zoo (ANS), thiab cov hlab ntsha ntawm dorsal keeb kwm (IV fiber). Cov fibers no muaj cov ntaub ntawv xav tau. Kev puas tsuaj los yog raug mob rau cov paj hlwb ua rau mob neuropathic.
Tsis tas li ntawd, cov paj hlwb twg ua rau txoj kev mob nrawm? Ib delta fibers (pab pawg III fibers ) yog 2-5 hli nyob rau hauv lub cheeb, myelinated, muaj ib tug ceev ceev conduction tshaj tawm (5-40 meters / sec), thiab nqa cov ntaub ntawv tsuas yog los ntawm nociceptive-mechanical los yog mechanothermal-specific nociceptors. Lawv qhov chaw txais me me. Yog li ntawd, lawv muab meej localization ntawm qhov mob.
Tib neeg kuj nug, cov hlab ntsha cais li cas?
Lub paj hlwb tau muab cais ua peb hom - pab pawg A cov paj hlwb pab pawg neeg B. cov paj hlwb , thiab pab pawg C. cov paj hlwb . Pawg A thiab B yog myelinated, thiab pab pawg C tsis tau sib cais. Cov pab pawg no suav nrog ob qho kev nkag siab fibers thiab lub cev muaj zog fibers . Qee hom neurons tsis muaj axon thiab xa cov cim los ntawm lawv cov dendrites.
Qhov twg C fibers xaus?
C - fibers xaus nyob rau hauv laminae I thiab II nyob rau hauv grey teeb meem ntawm tus txha caj qaum [3]. Nyob rau hauv cov nqe lus ntawm nociception, C - fibers cov nociceptors yog polymodal, uas yog qhib los ntawm cov cua sov, tshuab thiab tshuaj stimuli. Lub activation ntawm C - fibers yog los ntawm qhov tsis zoo nyob hauv lub cev, xws li kev hnov mob ntawm daim tawv nqaij.
Pom zoo:
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