Digestive system mesentery

what are intraperitoneal organs

organs enclosed from posterior abdominal wall (can move freely)

what are retroperitoneal organs

organs posterior to the peritoneum body wall (=layer lining inner surface abdominal wall) and are directly attached to the posterior abdominal wall.

what are secondarily retroperitoneal organs

organs that were initially intraperitoneal, but later became attached to the posterior body wall

What does the dorsal mesentery do

suspends the contact between the fore, mid and hindgut with the mesenchyme of the abdominal wall

ventral mesentary is divided into … by …

ventral mesentary is divided into

1. ventral mesogasrium (=lesser omentum) → strechec from stomach and proximal duodenum to the liver

2. ligament falciform → connects the liver to the ventrall body well

ventral mesentary is divived by the liver as it grows into the septum transversum

where is ventral mesentery derived from

of the septum transversum = thick plate of mesodermal tissue that occupies space between thoracic cavity and stalk of yolk sac

(septum transversum developed from visceral (splanchnic) mesoderm surrounding the heart that localizes between the primitive thoracic and abdominal cavities when cranial end of embryo curves into fetal position)

why is it clinically important for the ventral mesentary to remain continuous with the dorsal mesentery?

because the dorsal mesentery forms a continuous pathway that can influence how structures are accessed and how infections or fluids may spread

what is the fascial plane, where does it lie

fascial plane = Toldt’s fascia, it lies between the visceral and parietal peritoneum in organs that are attached to the posterior body wall. the fascial plane is crucial for these organs bc it provides a natural surgical plane and helps explain routed of infection spread with abdominal cavity.

what is the peritoneum

a continuous serous membrane that lines the inner surface of the abdominal cavity and then fold over to the surface of abdominal organs (=viscera)

What does it mean that the peritoneum is “reflected onto the viscera”?

It means that the peritoneum folds over from the abdominal wall and continues over the surface of the organs, forming the visceral peritoneum

What is the difference between parietal and visceral peritoneum?

patriel peritoneum is attached to the abdominal wals

visceral peritoneum covers the surface over viscera (internal organs)

What are peritoneal reflections?

Folds of peritoneum where it connects an organ to the abdominal wall. These were formerly called ligaments (e.g. falciform ligament, lienorenal ligament). knowledge hierover important for surgery

What structure connects the liver to the ventral abdominal wall?

falciform ligament (ligament falciform)

What structure connects the liver to the stomach

the lesser omentum

What artery runs through the mesentery proper and continues toward the yolk sac?

vitelline artery