上腔靜脈(拉丁語:superior vena cava)是一條粗短的靜脈干,下端連於右心房上緣,上端由左、右頭臂靜脈(無名靜脈)在右側第一胸肋結合處的後方匯合而成,垂直下降,在平對第三胸肋關節的下緣注入右心房,基本位於右前縱隔處。它將無氧血從身體上半部分運輸至右心房,接收從上肢、眼睛和頸部流回的血液。在縱隔處可找到右肺根斷面,可見到一條靜脈經其後方繞至上方向前注入上腔靜脈,此為奇靜脈。左右頭臂靜脈(brachiocephalic vein),分別由同側的頸內靜脈和鎖骨下靜脈在胸鎖關節後方匯合而成,匯合處所成的夾角稱為靜脈角。右頭臂靜脈幾乎垂直下降;左頭臂靜脈較長,起始後斜向右下,與右頭臂靜脈回合。斜跨主動脈弓上緣及主動脈弓三大分支根部的前方。
圖片
Wikiwand in your browser!
Seamless Wikipedia browsing. On steroids.
Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface.
Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.