What organ is the appendix

The appendix is ​​a type of tissue located in the lower right part of the abdomen, between the cecum and the ileum. Its range of movement is related to each person's physical constitution and is easily affected by external factors. This is mainly because the distal end of the appendix is ​​closed, so it is easy to cause symptoms of appendicitis. Regarding the location and introduction of the appendix, we can understand the following content and pay attention to how to protect the appendix.

Also known as the lumbrical process, it is a slender and curved blind tube located in the lower right side of the abdomen, between the cecum and the ileum. Its root is connected to the posteromedial wall of the cecum, and the distal end is free and closed. The range of motion varies greatly from person to person. Affected by the mesentery, etc., the appendix can extend to any position in the abdominal cavity. The appendix is ​​located in the lower right part of the abdomen, between the cecum and the ileum. It is a long and curved blind tube with a closed distal end.

Location of the appendix

The appendix display rate of 31 cadaver specimens was 100%. The root of the appendix was found to be located retrocecally in 27 cases (27/31, 87.1%) and at the tip of the cecum in 4 cases (4/31, 12.9%). The distance from the appendix to the tip of the cecum is mostly concentrated in the range of 1-4 cm, with an average of 2.5 cm and rarely exceeding 4.2 cm.

The shape and size of the appendix

The appendix is ​​1.58cm long and 4-7mm in diameter. The shape of the appendix was divided into: 18 cases (18/31, 58%) were vermiform, 10 cases (10/31, 32.3%) were tubular, and 3 cases (3/31, 9.7%) were short tubular with a blind tube at the distal end. In 18 cases (18/31, 58%), the appendix had uniform diameter, in 13 cases (13/31, 42%), the proximal part was thin and the distal part was thickened, and in 1 case (1/13, 7.7%), the distal part was thickened and dilated like beads. The diameter of the appendix is ​​mostly concentrated in the range of 4.6-5.4 mm, with an average of 5 mm. The maximum length of the appendix of the 31 cadavers in this group was 9 cm, the minimum was 1.7 cm, and the average was 5.2 cm. Among them, 1 case had a length equal to the average, 14 cases had a length less than the average, and 16 cases had a length greater than the average. The frequency of appendix length showed a non-normal distribution and had a large variation.

Course of the appendix

The shape of the appendix is ​​quite complex and is divided into the root of the appendix, the proximal part, and the distal part. The root of the appendix was located on the posterior medial wall of the cecum in 27 cases (27/31, 87.1%), of which the proximal part of the appendix was located in front of the terminal ileum in 14 cases (14/27, 51.9%), behind the terminal ileum in 12 cases (14/31, 44.4%), and under the serosa behind the cecum in 1 case (1/27, 3.7%), running from the lower left to the upper right. In 4 cases (4/31, 12.9%), the root of the appendix was located at the tip of the cecum, of which the proximal part of the appendix was located under the cecum before the terminal ileum in 3 cases and behind the terminal ileum in 1 case. The distal part of the appendix had more variations, with 18 cases (18/31, 58.1%) to the left, 7 cases (7/31, 22.6%) to the right, 3 cases (3/31, 9.6%) to the upper left, 1 case (1/31, 3%) to the upper right, 1 case (1/31, 3%) to the left and folded into an M shape, and 1 case (1/31, 3%) located in the left pelvic cavity.

Appearance of the appendix

The surface was smooth in 26 cases (26/31, 83.9%) and not smooth in 5 cases (5/31, 16.1%). Thirteen cases (13/31, 41.9%) had bright color, 18 cases (18/31, 58.1%) had darker color, of which 3 cases (3/18, 16.7%) were dark red, dirty yellow-green, and dark gray, respectively, and dirty ascites was visible in the abdominal cavity of these three cases; in another 3 cases (3/18, 16.7%), the distal end of the appendix was dark red with bleeding spots. In 24 cases (24/31, 77.4%), the mesoappendix was smooth and stretched, and the appendicular artery was clear. The mesoappendix was thickened, shortened and deformed in 7 cases (7/31, 22.6%).