What Is the Abdominal Aorta?

The abdominal aorta is the portion of the descending aorta in the abdominal cavity. It is located behind the peritoneum, in front of the vertebra, and slightly to the left. On its right side is the inferior vena cava, and in front of it are the pancreas, the lower part of the duodenum, and the mesenteric root of the small intestine. At the lower edge of the fourth lumbar vertebra, the abdominal aorta is divided into left and right common iliac arteries. There are many branches of the abdominal aorta along the way. The distal part of the descending aorta. The continuation of the aortic chest from the condylar aortic hole descends along the front of the spine and is divided into the left and right common iliac arteries near the lower edge of the fourth lumbar vertebra. There is an inferior vena cava on the right side of the abdominal aorta, and the pancreas, the level of the duodenum and the mesenteric root of the small intestine.

The abdominal aorta is the portion of the descending aorta in the abdominal cavity. It is located behind the peritoneum, in front of the vertebra, and slightly to the left. On its right side is the inferior vena cava, and in front of it are the pancreas, the lower part of the duodenum, and the mesenteric root of the small intestine. At the lower edge of the fourth lumbar vertebra, the abdominal aorta is divided into left and right common iliac arteries. There are many branches of the abdominal aorta along the way. The distal part of the descending aorta. The continuation of the aortic chest from the condylar aortic hole descends along the front of the spine and is divided into the left and right common iliac arteries near the lower edge of the fourth lumbar vertebra. There is an inferior vena cava on the right side of the abdominal aorta, and the pancreas, the level of the duodenum and the mesenteric root of the small intestine.

Chinese name

Abdominal aorta

Foreign name

Abdominal aorta

Adjacency

Anterior pancreas and left renal vein

Branch positioning

Celiac trunk, superior mesenteric artery

Abdominal aorta anatomy:

1. Abdominal aorta:

The abdominal aorta is also called the abdominal aorta. It is the section of the descending aorta in the abdominal cavity. It is flat at the height of the 12th thoracic vertebra. It continues from the sacral aortic fissure and descends along the left front of the spine to the lower edge of the 4th lumbar vertebra. Common and middle iliac arteries. The abdominal aorta is located behind the peritoneum, with the inferior vena cava on the right side and the lower duodenum, pancreas, and mesentery roots in the front.

There are two types of abdominal aorta along the way: wall branch and visceral branch. The wall branches are relatively small, mainly including the inferior iliac artery and the lumbar artery, which are mainly distributed in the underside of the iliac crest, waist, anterior and lateral muscles, skin, spinal cord, and their capsules.

Dirty branches are relatively large, divided into two types: paired and unpaired, with three branches each. The visceral branches in pairs have the middle adrenal artery, renal artery, and internal spermatic artery or testicular artery (ovarian artery in women) from top to bottom. Unpaired visceral branches include celiac arteries, superior intestinal arteries, and inferior intestinal arteries from top to bottom. They are mainly distributed in the unpaired organs in the abdominal cavity (liver, gallbladder, pancreas, spleen, and gastrointestinal).

2, abdominal cavity:

The part of the body cavity in the abdomen, the body's abdominal cavity is located below the iliac crest, above the pelvic cavity, and continues with the pelvic cavity. There is a serous layer around the abdominal cavity called the peritoneum. The main organs in the abdominal cavity are organs of the digestive system that secrete the urinary system. The digestive system includes cavity organs such as stomach, intestine, gallbladder, etc. and parenchymal organs such as liver, spleen, and pancreas. When the bladder is full and the uterus rises from the pelvis in the second trimester, it becomes an abdominal organ. The anatomical "peritoneal cavity" can be completely separated from the "peritoneal cavity", and the "abdominal cavity" in practical applications generally refers to the "peritoneal cavity". The difference between men and women in the abdominal cavity is that men's peritoneal cavity is completely closed and has no communication with the outside world; women's peritoneal cavity is connected with the outside world through the fallopian tube, uterus and vagina. There is a small amount of slurry in the normal abdominal cavity, which acts as a lubricant.

Morphological structure of abdominal aorta:

The abdominal aorta is the abdominal segment of the descending aorta. It starts from the aortic hiatus of the iliac crest, descends along the left front of the spine, and divides into the left and right common iliac arteries at the lower edge of the fourth lumbar vertebra. The bifurcation angle is 62.8 ° (22 ° ~ 90 °). The surface anatomy of the bifurcation point is equivalent to the midpoint of the line connecting the highest points of the left and right condyles. The average length of the abdominal aorta is 13.8 cm, the outer diameter at the midpoint is 1.5 cm on the average, and the outer extremity of the terminal is 1.7 to 1.90 cm. In front of the abdominal aorta, the left hepatic lobe, the small omentum, the peritoneal plexus, the end of the esophagus, the transverse colon mesentery, the splenic vein, the pancreas, the left renal vein, the level of the duodenum, the mesenteric root and the small intestine Sacral, aortic plexus, and anterior aortic lymph nodes. The posterior side is adjacent to the upper 4 lumbar vertebrae and their intervertebral discs, the anterior longitudinal ligament, and the left 2 to 4 lumbar veins. The right side of the abdominal aorta is the inferior vena cava, the right lame foot, the right celiac ganglion, the right splanchnic nerve, the chylopool, and the beginning of the thoracic duct. The left side of the abdominal aorta is the left lame foot, the left celiac ganglia, and the left splanchnic nerve. Starting from 2.5 cm above the pyloric plane, draw a strip with a width of about 2 cm down to the bottom left of the umbilical 2 cm, showing the surface projection of the abdominal aorta. The branches of the abdominal aorta include the visceral branch, the wall branch, and the terminal branch. Its visceral branch is thicker, reaching the organs of the abdominal cavity, and its wall branch is relatively small.