E whakaatu taipitopito ana te tauira i te hanganga whakawhiti-wāhanga o te tuawaru o ngā tuaiwi uma. E ai ki te tūnga tinana noa, ka papatahi te mediastinum hei hanga i tētahi hoahoa whakawhiti-wāhanga, e whakaata ana i te whanaungatanga whakawhiti-wāhanga o te kapiti o te pukahukahu, ngā uaua, ngā uaua, me te bronchi, te pleura, ngā uaua intercostal me ngā uaua uma o mua me maui. Ka taea hoki e ngā uaua uma o mua me maui te whakaatu i te hanganga me te whanaungatanga tata o te tuaiwi me te taurakira mā roto i tēnei papa, ā, ka taea te whakaatu i te atria me ngā ventricle maui me te matau ki mua.