b'\n_START_ARTICLE_\nS veida zarna\n_START_PARAGRAPH_\nS veida zarna jeb s veida lokzarna (lat\xc4\xab\xc5\x86u: colon sigmoideum) ir lokzarnas (colon) p\xc4\x93d\xc4\x93jais posms, kas ir resn\xc4\x81s zarnas (intestinum crassum) da\xc4\xbca. S veida lokzarna ir lejupejo\xc5\xa1\xc4\x81s zarnas (colon descendens) turpin\xc4\x81jums, kas t\xc4\x81l\xc4\x81k p\xc4\x81riet taisnaj\xc4\x81 zarn\xc4\x81. (rectum). Savu nosaukumu S veida zarna ir ieguvusi no savas S veida formas.\n_START_SECTION_\nApraksts\n_START_PARAGRAPH_\nS veida zarna atrodas zarnkaula (os ilium) kreisaj\xc4\x81 bedr\xc4\x93. T\xc4\x81 iet no zarnkaula aug\xc5\xa1\xc4\x93j\xc4\x81s \xc5\xa1\xc4\xb7autnes (crista iliaca) apvidus l\xc4\xabdz krustu zarnkaula loc\xc4\xabtavai (articulatio sacroiliaca dx.) apak\xc5\xa1\xc4\x81, un III krustu skrieme\xc4\xbca l\xc4\xabmen\xc4\xab p\xc4\x81riet taisnaj\xc4\x81 zarn\xc4\x81. S veida zarnas aizmugur\xc4\x93 izvietojas \xc4\x81r\xc4\x93jie zarnkaula asinsvadi, kreisais bumbierveida muskulis un kreisais krustu kaula pinums. Zarnas priek\xc5\xa1pus\xc4\x93 atrodas v\xc4\xabrie\xc5\xa1iem ur\xc4\xabnp\xc5\xabslis, bet sieviet\xc4\x93m dzemde, k\xc4\x81 ar\xc4\xab tiev\xc4\x81s zarnas cilpas.\n_START_SECTION_\nZarnas taukpl\xc4\x93ve\n_START_PARAGRAPH_\nS veida zarna no vis\xc4\x81m pus\xc4\x93m ir segta ar v\xc4\x93derpl\xc4\x93vi, kas veido zarnas taukpl\xc4\x93vi (sigmo\xc4\xabdo mezokolonu), kuras garums samazin\xc4\x81s no vidus uz zarnas galiem. T\xc4\x81d\xc4\x81 veid\xc4\x81 S veida zarnas savienojuma vietas ar lejupejo\xc5\xa1o lokzarnu un taisno zarnu ir cie\xc5\xa1i nofiks\xc4\x93tas ar \xc4\xabsu taukpl\xc4\x93vi, bet zarnas vidusda\xc4\xbca ir sam\xc4\x93r\xc4\x81 br\xc4\xabva.\n_START_SECTION_\nSa\xc5\xa1aurin\xc4\x81t\xc4\x81jmusku\xc4\xbci\n_START_PARAGRAPH_\nUz lejupejo\xc5\xa1\xc4\x81s un S veida zarnas robe\xc5\xbeas atrodas Ballija sa\xc5\xa1aurin\xc4\x81t\xc4\x81jmuskulis (sphincter coli sigmoidei descendentis). S veida zarnas vidusda\xc4\xbc\xc4\x81 ir fiks\xc4\x93ts Rossi\xe2\x80\x94Mitj\xc4\x93 sa\xc5\xa1aurin\xc4\x81t\xc4\x81jmuskulis, bet uz zarnas robe\xc5\xbeas ar taisno zarnu atrodas sigmorekt\xc4\x81lais sa\xc5\xa1aurin\xc4\x81t\xc4\x81jmuskulis.'