Kalmar "sinus cavernosus" tana nufin jerin tashoshi masu alaƙa da juna waɗanda suke a gindin kwakwalwa, a cikin kwanyar. Wadannan tashoshi suna kewaye da spongy, cavernous tissue na kogon sinus, kuma suna zubar da jini daga kwakwalwa da nama da ke kewaye. Tushen cavernosus wani muhimmin tsari ne domin yana aiki a matsayin hanyar da jini ke gudana zuwa ko daga kwakwalwa, kuma yana da hannu wajen daidaita hawan jini da sauran ayyukan ilimin halittar jiki.