NEET PG Medical – 2012 – Question – 15
Development of peritoneal cavity is from ?
a) Mesenchyme
b) Intraembryonic coelom
c) Ectoderm
d) Endoderm
Show Answer
Correct Answer – B
Ans. is ‘B’ i.e., Intraembyonic coelom [Ref Embryology by Indu Khuran 2″dle p. 96]
All body cavities develop from intraembryonic coelum. These cavities are peritoneal cavity, pleural cavity and pericardial cavity.
- The peritoneum develops ultimately from the mesoderm of the trilaminar embryo.
- Lateral plate mesoderm splits to form two layers separated by an intraembryonic coelom.
- These two layers develop later into the visceral and parietal layers found in all serous cavities including peritoneum. And the potential space of intraembryonic coelom between these two layers become the body cavities like peritoneal cavity, pleural cavity and pericardial cavity.
- As embryo develops, the various abdominal organs grow into the abdominal cavity from structures in the abdominal wall. In this process they become enveloped in a layer of peritoneum, i.e. visceral layer.
- Peritoneal folds develop from the ventral and dorsal mesentery of the embryo.
- Peritoneum, pericardium and pleura develop from -, Mesoderm (lateral plate mesoderm)
- Peritoneal cavity, pericardial cavity and pleural cavity develop from Intraembryonic coelom.
