The cavity between the pelvic entrance and the diaphragm. Functionally, the abdomen is where most of the digestive tract is located, which means that digestion and absorption are carried out here.
The thoracic cavity is surrounded by the thorax and diaphragm, and the upper boundary is the upper opening of the thorax, which is connected with the neck.
Intestinal cavity refers to the space in the mouth of coelenterates.
Extended data
The abdominal cavity in the middle of the abdomen, from xiphoid process down to pubic symphysis, always represents the white line of abdominal wall. There is an umbilical cord at the midpoint of the white line. You can see that a muscular person has eight rectus abdominis stretching to both sides.
You can see from the outside that these muscles are crossed by three or more tendons. One is near the xiphoid cartilage, one is in the navel, and the other is in between. The white line and these three conditional tendon strokes divide the abdomen into "six squares", which is exactly what bodybuilders are looking for.
The upper edge of abdomen is the lower edge of rib connected by (8,9, 10) pseudoosteochondral. The lower margin is anterior iliac spine and Poupart ligament, which starts from anterior superior iliac spine and ends at pubic spine. The lower bound is slotted on the body surface. On both sides above the pubic bone are groin rings, which are the openings of the abdominal muscle layer, through which the male spermatic cord passes. Inguinal hernia can occur here.