Body cavities
Sanjaya AdikariDepartment of Anatomy
Folding of the embryo
Ventral mesentary
Dorsal mesentary
R L
Mesentery
• Formation of ventral and dorsal mesenteries divides the coelom into right and left components
• Most of the ventral mesentery breaks down and cause confluence of right and left halves
• Ventral mesentery persists in the region of the developing stomach and the liver
– Ventral mesogastrium (lesser omentum)
– Falciform ligament
Peritoneal cavity• Diaphragm separates the peritoneal cavity from the
pleuropericardial cavity above
Mesentary
mesentery
peritoneum
retro-peritoneal
cavity
Pleural and pericardial cavities
Pleural and pericardial cavities… cont.
• Pleuropericardial folds separate the
pleural and pericardial cavities
• Initially the pericardial cavity lies
anteriorly
• Later, due to extensive growth of the
lungs, the pleural cavities expand on
either side to grow over the pericardial
cavity