Anterior （Ventral, Front） Nearer to the front of the body is anterior. Usually the anterior surface of the hand is called the volar or palmar surface and the inferior surface of the foot is called the plantar surface or sole. Ventral is equivalent to anterior.

Posterior （Dorsal, Behind） Nearer to the back of the body is posterior. Dorsal is interchangeable with posterior. Usually the posterior or dorsal surface of the hand is called dorsum. The term dorsum is also used to describe the anterosuperior surface of the foot.

前（腹侧） 靠近身体的前部，常将手的前面称为掌面或手掌，而脚的下面称为 面或足底。腹侧等同于前方。

后（背侧） 靠近身体的背部，背侧等同于后方，常将手的背面称为手背，背侧这一术语亦用以形容足的前上面。

Inferior （Caudal, Below） Toward the feet or lower part of the body and further from the head. The term caudal means nearer to the tail and is used in description of embryos.

Medial Toward the median plane of the body.

Lateral Farther away from the medium plane of the body.

In the upper limb, the radius is the lateral bone of the forearm and the ulna is the medial one. Thus, the term radial is referred to the lateral and the ulnar is referred to the medial.

Intermediate Between two structures, one of which is medial and the other lateral.

下（尾侧、下方） 对向脚或身体下部离头较远的部位。尾侧意指近尾，常用以胚胎的描述中。

内侧 靠近身体正中面。

外侧 远离身体正中面。

就上肢而言，桡骨是前臂外侧的骨，尺骨位于内，因而桡侧意为外侧，尺侧意为内侧。

中间 指的是在内侧和外侧两个结构之间。

The common bile duct, passes in the free edge of the lesser omentum with the hepatic artery and the portal vein. The common bile duct passes inferiorly, anterior to the epiploic foramen, where it is anterior to the right edge of the portal vein and on the right side of the hepatic artery. The common bile duct passes posterior to the superior part of the duodenum and the head of the pancreas. On the left side of the descending part of the duodenum, the common bile duct comes into contact with the pancreatic duct and the two of them run obliquely through the wall of the duodenum, where they usually unite to form the hepatopancreatic ampulla （Vater's）. There is a sphincter of hepatopancreatic ampulla （sphincter of Oddi）, which normally keeps the ostium of hepatopancreatic ampulla closed.

胆总管与肝动脉和门静脉行于小网膜游离缘内。胆总管下行于网膜孔前方，位于门静脉右缘前方和肝动脉右侧。在十二指肠上部和胰头后方，胆总管继续下行。在十二指肠降部左侧，胆总管与胰管会合，两者斜行穿过十二指肠壁，通常在此会合而成肝胰壶腹（法特壶腹），此处有一肝胰壶腹括约肌（阿迪括约肌），通常它保持肝胰壶腹的开口关闭。