Sigmoid nyuv: qhov chaw, lub anatomical nta

Sigmoid nyuv (SK) yog xav tau cov qis ib feem ntawm cov nyuv, uas kis tau mus rau hauv cov nyuv, yog li, nws koom nyob rau hauv tus txheej txheem ntawm thauj cov faeces thiab lawv tom ntej tshem tawm ntawm tib neeg lub cev.

Yog li ntawd, qhov chaw ntawm lub sigmoid nyuv yog nyob rau hauv lub cheeb tsam ntawm lub sab sauv qhib ntawm ib tug me me phiab, nws yog qhia laterally mus rau sab xis rau krestsu, ces puv mus rau sab laug thiab xeeb theem nrab kab mus down, qhov twg hauv lub thib peb vertebra krestsovogo kis mus rau hauv lub qhov quav. Nyob rau hauv cov ntaub ntawv no, nws kav ntev npaum yog hom twg los ntawm nees nkaum rau xya caum-tsib centimeters (feem ntau qhov no daim duab yog sib npaug rau plaub caug-tsib centimeters).

Sigmoid nyuv muaj ob tug flexure hinges cov uas tau mus rau hauv lub plab mog. Qhov luaj li cas thiab zoo ntawm cov loops sib txawv thiab nyob ntawm cov qauv ntawm cov tib neeg lub cev, lawv yog nyob ib sab mus rau sab laug ilium, thiab nqis los rau hauv lub pelvic kab noj hniav, nrog ib tug ntawm lawv txojkev cia, thiab lwm yam - txog li. Uas yog vim li cas lub sigmoid nyuv xam qhovkev S- zoo li tus. Pawg Xya Caum mob tawm ntawm ib puas qhov ntev ntawm lub IC voj mas nws txawv ntawm nees nkaum-tsib mus rau plaub caug-tsib centimeters, nws yog hu ua normosigma. Yog hais tias nws luaj li cas yog tsawg tshaj nees nkaum-tsib centimeters, hu ua lub sigmoid nyuv brahisigmoy. Cov txheej kab uas hla ntawm rau nyuv santmetrov, txawm li cas los nyob rau hauv cov ntaub ntawv ntawm tshaj no loj, nws muaj peev xwm yuav sib cav hais tias nws cov phab ntsa nyeem tas.

SC peritoneum them rau tag nrho cov sab thiab muaj ib tug mesentery, i.e. ib tug quav, los ntawm cov uas cov hnyuv yog ruaj mus rau lub plab phab ntsa ntawm kaum tsib centimeters ntev, uas muab nws nrog ntau dua cov kev mus ncig. Qhov no quav nyob rau hauv nws cov qauv muaj ob feem, ib tug ntev ntawm yim centimeters, rau lwm yam - ntawm kaum. Uas yog vim li cas lub IC muaj peev xwm yuav tawm mus nyob rau hauv lub pelvic kab noj hniav, thiab nyob rau hauv cov kev taw qhia rau lub plab los yog lub siab. Nco ntsoov tias tshuam mesentery ureter, ntawm zes qe menyuam thiab iliac hlab ntsha nyob rau hauv lub sab chaw raws li lumbar thiab iliac leeg, rau sab laug sacral ob leeg. Ces nws txav mus rau qhov chaw ntawm lub vertebral krestsovogo department thiab xaus ntawm lub thib peb vertebra.

Sigmoid cov nyuv, lub qhov chaw uas tso cai rau nws tuaj mus rau hauv kev sib cuag nrog cov hnyuv los yog yuav spliced nrog lawv adhesions, tej zaum kuj tuaj mus rau hauv kev sib cuag nrog tag nrho cov tub ceev xwm raws li mob plab (tsuas yog txiav) raws li zoo raws li lub pelvic kab noj hniav.

Nws yuav tsum tau muab sau tseg hais tias feem ntau heev (yog ntev mesentery) sigmoid nyuv yog tsiv mus rau hauv lub iliac fossa, yog li ntawd koj yuav tsum tau paub qhov txawv nws los ntawm lub cecum. Ua nws tsis yog yooj yim, cia li yuav tsum nco ntsoov hais tias txav deb ntawm SC txuj lom dab uas tsis nyob rau hauv lub hnyuv qhov muag tsis pom.

Ib zaug ntxiv, peb qhia hais tias lub sigmoid cov nyuv, lub qhov chaw ntawm uas yog tau piav saum toj no, muaj changeable morphology thiab lub cev, raws li lawv zaviyast ntawm cov txheej txheem uas tau tshwm sim nyob rau hauv nws, raws li tau zoo raws li tib neeg lub cev, nws muaj hnub nyoog nta thiab ntau lwm yam tseem ceeb.

Thaum cov kev hloov mus rau lub descending nyuv sigmoid cai narrowing ntawm lub lumen, qhov no tshwm sim yog hu ua tus sphincter ntawm Bali. Nws yog nyob rau ntawm lub sab saum toj ntawm lub iliac pob txha thiab muaj ib tug ntev txog li ob centimeters. Yog li, sab kab uas hla ntawm lub rwj, situated qab uas tsam yog los ntawm ob mus rau plaub centimeters, thiab nyob rau hauv sfinkernoy cheeb tsam - txog li ob centimeters.

Tsis tas li ntawd qhov chaw ntawm lub sigmoid nyuv sfinkera (lumen narrowing) muaj nyob rau hauv nruab nrab, cov qauv no yog hu ua tus sphincter Myute, tab sis nws muaj peev xwm yuav tau tsiv ntxiv los ntawm nws cov centre. Nyob rau hauv cov ntaub ntawv no sab nraud txoj kab uas hla hnyuv rau no tsam yog muaj li ntawm ob mus rau centimeters, thiab nyob rau hauv Myute tsam - los ntawm ib mus rau peb centimeters.

Yog li, peb tam sim no paub tsis tau tsuas yog qhov chaw uas cov sigmoid cov nyuv, tab sis kuj nws anatomical nta. Nws plays ib qho tseem ceeb luag hauj lwm nyob rau hauv tib neeg lub cev.