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十二指肠

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十二指腸
Tractus intestinalis duodenum.svg
Image of the gastrointestinal tract, with the duodenum highlighted.
Duodenumanatomy.jpg
Diagram of the human duodenum with major parts labelled
基本信息
发育自Foregut英语Foregut (1st and 2nd parts), Midgut英语Midgut (3rd and 4th part)
屬於小肠
系統消化系统
动脉Inferior pancreaticoduodenal artery英语Inferior pancreaticoduodenal artery, Superior pancreaticoduodenal artery英语Superior pancreaticoduodenal artery
静脉Pancreaticoduodenal veins英语Pancreaticoduodenal veins
神经celiac ganglia英语celiac ganglia, 迷走神经[1]
标识字符
拉丁文Intestinum duodenum
MeSHD004386
TA98A05.6.02.001
TA22944
FMAFMA:7206
格雷氏p.1169
解剖學術語
腹部器官的位置
腹部器官的位置
人体胃肠道: 1=食管,2=胃,3=十二指肠,4=迴肠,5=盲肠,6=阑尾,7=结肠,8=直肠,9=肛门
人体胃肠道:
1=食管,2=,3=十二指肠,4=迴肠,5=盲肠,6=阑尾,7=结肠,8=直肠,9=肛门

十二指肠拉丁語Duodenum)是多数高等脊椎动物小肠的始段。哺乳动物爬行动物拥有十二指肠。鱼的十二指肠不明显,有时用前肠近侧小肠称呼。哺乳动物的小肠可能是吸收铁的主要部位。

十二指肠是小肠最短的部分,之后是空腸迴肠。人类的十二指肠长达25-38厘米,从十二指肠球部起始,到十二指肠悬肌结束。可分为上部(球部)、降部、水平部和升部。[2]它包绕头,并固定于腹腔后壁。

人体的十二指肠向左,动物的则朝前开口。而十二指肠大乳头则是肝胰壶腹的开口处。

命名

十二指肠的拉丁文duodenum来自中古拉丁语,全称是intestīnum duodēnum digitōrum,長達十二个指头併起的寬度的小肠[3]。拉丁表达方式可能是对希腊语十二指头长dodekadaktylon (δώδεκαδάκτυλοv)的直译。

分泌腺

臨床意義

幽門螺旋桿菌是臨床上常見於十二指腸的細菌感染,嚴重者易導致十二指腸潰瘍。潰瘍通常發生在十二指腸的前段,此處胃酸剛進入小腸,還未與十二指腸分泌的鹼性物質混合。

註釋

  1. ^ Nosek, Thomas M. Section 6/6ch2/s6ch2_30. Essentials of Human Physiology. [2020-09-25]. (原始内容存档于2016-03-24). 
  2. ^ 高秀来,系统解剖学(第3版)109-110页,北京大学医学出版社。ISBN 978-7-5659-0686-2
  3. ^ American Heritage Dictionary, 4th edition

外部連結

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十二指肠
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