Summary of dorsal mesogastrium and its derivatives

Dorsal mesogastrium

Mesogastrium:

the portion of the primordial mesentery that encloses the stomach and from which the lesser omentum , greater omentum and other ligaments are  develops.

THE DORSAL MESENTERY extends from the lower esophagus to rectum and throughout its length serves as a pathway to the gut for blood vessels, nerves, and lymphatics

In the area of the stomach, it is called the dorsal mesogastrium 

Derivatives of dorsal mesogastrim

1.      Greater omentum

2.      Gastrosplenic ligament

3.      Gastrophrenic ligament

4.      Lienorenal ligament

Summary of ventral mesogastrium and its derivatives

Ventral mesogastrium

The gastrointestinal tract is developed from an endodermal tube which is known as the primitive gut which is held on to the body wall by the dorsal and ventral mesentery.

The primitive midline mesentery extending between future stomach and proximal duodenum and the anterior abdominal wall superior to the umbilicus (umbilical vein). The liver develops within it; consequently, the lesser omentum, coronary and falciform ligaments are derivatives of it. The umbilical vein runs in its caudal free edge, becoming the postnatal round ligament of the liver.

Derivatives of Ventral mesogastrium

1.      Lesser omentum

2.      Falciform ligament

3.      Coronary ligament

4.      Right and left triangular ligament

Summary of Lateral longitudinal arch

Lateral longitudinal arch

It is composed of the calcaneus, the cuboid, and the fourth and fifth metatarsals

It  is lower than the medial  longitudinal arch.

It is formed by less bone and joint

It is less mobile

It commonly bears body weight

The peak of the lateral longitudinal arch is located at the level of articular facets on the superior outermost layer of the calcaneum (i.e., at the level of subtalar joint).


The posterior column of the lateral longitudinal arch is composed by the lateral tubercle of the calcaneum and the anterior column is composed by the heads of the lateral 2 metatarsals.


The primary joint of the lateral longitudinal arch is calcaneocuboid joint.

Summary of medial longitudinal arch

Medial longitudinal arch

It is made up by the calcaneus, the talus, the navicular, the three cuneiforms (medial, intermediate, and lateral), and the first, second, and third metatarsals

The medial arch is higher than the lateral longitudinal arch.

It is formed by more bones and joints

It is more mobile

It acts as shock absorber 

Summit: 

Its summit is at the superior articular surface of the talus

Pillars: 

• The medial half of the calcaneum creates the posterior column of the medial longitudinal arch.
• The heads of the medial 3 metatarsals create the anterior column of the medial longitudinal arch.

Joints:
The key joints of the medial longitudinal arch are talocalcaneonavicular and subtalar