Ileocecal opening - kaimoukou

…The large intestine begins in the lower right abdomen (cecum), moves upward along the right side of the abdomen (ascending colon), bends to the left under the liver (right flexure), then moves left along the upper part of the abdominal cavity along the greater curvature of the stomach in front of the duodenum (transverse colon), bends downward again in front of the lower part of the spleen (left flexure), moves downward along the left side of the abdomen (descending colon), reaches the lower left abdomen, then curves in an S-shape (sigmoid colon), descends from the center of the lower abdomen (rectum), and reaches the anus. The ileocecal opening is the boundary between the ileum and the large intestine, and the end of the ileum protrudes slightly into the large intestine to form a raised area. Its shape varies, but it is basically two lip-like processes, one above the other, that form the ileocecal valve, which prevents the contents of the large intestine from flowing back into the ileum. …

*Some of the terminology that mentions the ileocecal opening is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…大腸の存在する位置は，右下腹部に始まり(盲腸)，右側腹部を上方にすすんで(上行結腸)，肝臓の下面で左方へ屈曲し(右結腸曲)，そこから腹腔の上部を胃の大彎（だいわん）に沿って十二指腸の前面を左方へすすみ(横行結腸)，脾臓の前下部で下方へ再び屈曲して(左結腸曲)，左側腹部を下方へ向かい(下行結腸)，左下腹部に達したのち，S状にうねりながら(S状結腸)，下腹部中央から下行して(直腸)，肛門に達する。　回盲口は回腸と大腸の境界部で，回腸末端が少し大腸腔内に突出して高まりをつくっている。その形状は種々であるが，基本的には上下2枚の唇状突起となって回盲弁を形成し，大腸の内容物が回腸へ逆流するのを防いでいる。…

※「回盲口」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報