Intraembryonic Coelom Formation and Structures
13 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

Which cavity encloses the heart and develops from the most interior portion of the intraembryonic coelom?

  • Peritoneal Cavity
  • Pericardial Cavity (correct)
  • Pleural Cavity
  • Thoracic Cavity

What structure separates the pericardial cavity from the pleural cavities?

  • Septum transversum
  • Pleuropericardial folds (correct)
  • Lateral body walls
  • Pleuroperitoneal folds

The diaphragm originates from which part of the embryonic structure?

  • Peritoneal cavity
  • Pleuropericardial folds
  • Septum transversum (correct)
  • Pleural cavities

From which portions of the intraembryonic coelom do the pleural cavities develop?

<p>Lateral portions (A)</p> Signup and view all the answers

What is the role of the pleuroperitoneal membranes during development?

<p>Form the diaphragm (D)</p> Signup and view all the answers

What is the initial space that forms the intraembryonic coelom?

<p>The space between the somatic and splanchnic mesoderm (D)</p> Signup and view all the answers

What occurs during the lateral folding of the embryo?

<p>Enclosure of the intraembryonic coelom (B)</p> Signup and view all the answers

What is the role of the pleuropericardial folds during development?

<p>To separate the pleural and pericardial cavities (B)</p> Signup and view all the answers

What structure helps to separate the thoracic and abdominal cavities?

<p>Septum transversum (A)</p> Signup and view all the answers

What forms the dorso-ventral structure in the developing embryo?

<p>Septum transversum (D)</p> Signup and view all the answers

Which of the following statements about the pericardioperitoneal canal is true?

<p>It connects the thoracic and abdominal cavities (A)</p> Signup and view all the answers

What does the ventral mesentery develop from?

<p>Septum transversum (D)</p> Signup and view all the answers

What happens to the septum transversum during development?

<p>It shifts caudally to position for the future diaphragm (C)</p> Signup and view all the answers

Flashcards

Pericardial Cavity

The cavity that encloses the heart. It develops from the most interior part of the intraembryonic coelom.

Pleural Cavities

The cavities that enclose each lung. They develop from the lateral portions of the intraembryonic coelom.

Peritoneal Cavity

The cavity enclosing most abdominal organs. It develops from the posterior portion of the intraembryonic coelom.

Pleuropericardial Folds

These folds grow ventrally from the lateral body walls and fuse to separate the pericardial cavity from the pleural cavities.

Signup and view all the flashcards

Pleuroperitoneal Folds

These folds grow ventrally from the body walls and extend to the septum transversum, forming the diaphragm. They divide the pleural cavities from the peritoneal cavity.

Signup and view all the flashcards

Intraembryonic Coelom

The space within the embryo, formed by the separation of the somatic and splanchnic mesoderm layers. It becomes enclosed during embryonic folding.

Signup and view all the flashcards

Pericardioperitoneal Canals

Openings connecting the abdominal and thoracic cavities, located posterior to the septum transversum. They are closed by the pleuroperitoneal membranes during diaphragm formation.

Signup and view all the flashcards

Pleuropericardial Folds and Membranes

Extensions of mesoderm that grow from the lateral body wall and meet in the midline, separating the pleural and pericardial cavities. They carry the phrenic nerve and contribute to the parietal pericardium, forming the fibrous pericardium.

Signup and view all the flashcards

Pleuroperitoneal Folds and Membranes

Extensions of mesoderm that extend from the body wall and connect with the septum transversum and mesentery of the esophagus, closing the pericardioperitoneal canals during diaphragm formation.

Signup and view all the flashcards

Dorsal Mesentery

A double layer of peritoneum that suspends the gut tube from the dorsal body wall, extending from the lower esophagus to the rectum. Some parts are lost as the gut fuses with the posterior body wall.

Signup and view all the flashcards

Ventral Mesentery

A double layer of peritoneum derived from the septum transversum. It extends from the liver to the ventral body wall and forms the liver, stomach, and duodenum.

Signup and view all the flashcards

Mesentery of Esophagus

A double layer of peritoneum that suspends the esophagus. It develops into the cura of the diaphragm around the aorta.

Signup and view all the flashcards

Septum Transversum

A wedge-shaped piece of mesoderm situated ventrally that partially divides the coelom into a thoracic pericardial cavity and an abdominal peritoneal cavity. Cranial folding and differential growth move it down towards the future diaphragm.

Signup and view all the flashcards

Study Notes

Intraembryonic Coelom Formation

  • The intraembryonic coelom arises from the lateral plate mesoderm, which divides into somatic and splanchnic layers.
  • The space between these layers constitutes the initial intraembryonic coelom.
  • Embryonic folding fuses the lateral body walls, enclosing the coelomic space within the embryo.

Coelomic Partitioning Structures

  • Pericardioperitoneal canal: Openings between the thoracic and abdominal cavities, later closed by membranes.
  • Pleuropericardial fold/membrane: Mesodermal extensions separating the pericardial and pleural cavities, contributing to the pericardium.
  • Pleuroperitoneal fold/membrane: Mesodermal extensions closing the pericardioperitoneal canals, contributing to the diaphragm and separating pleural and peritoneal cavities.
  • Dorsal mesentery: Double-layered peritoneum suspending the gut from the dorsal body wall (esophagus to rectum).
  • Ventral mesentery: Double-layered peritoneum arising from the septum transversum, connecting liver to ventral body wall (stomach, duodenum).
  • Mesentery of esophagus: Double-layered peritoneum for the esophagus, becoming part of the diaphragm's crura.

Septum Transversum Development

  • The septum transversum is a mesodermal structure initially cranially located.
  • Through body folding and differential growth, it moves caudally to the future diaphragm location.
  • It acts as a ventral partition dividing the coelom into thoracic and abdominal cavities.

Adult Body Cavities and Embryonic Origins

  • Pericardial Cavity: Derived from the intraembryonic coelom's inner portion. Encloses the heart.
  • Pleural Cavities: Derived from the intraembryonic coelom's lateral portions. Encloses the lungs.
  • Peritoneal Cavity: Derived from the intraembryonic coelom's posterior portion. Encloses most abdominal organs.

Partitioning of Intraembryonic Coelom

  • Pleuropericardial folds fuse, separating the pericardial from pleural cavities.
  • Pleuroperitoneal folds/membranes connect to the septum transversum, creating the diaphragm and separating the pleural from peritoneal cavities.

Diaphragm Development

  • The diaphragm initially lies high in the neck region.
  • As the embryo grows, it descends to its definitive position.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Quiz Team

Description

This quiz covers the formation of the intraembryonic coelom from the lateral plate mesoderm and the related partitioning structures. It explores how embryonic folding contributes to coelomic development and the roles of various mesodermal extensions in cavity separation. Test your understanding of these fundamental concepts in embryology.

More Like This

Use Quizgecko on...
Browser
Open
Browser
Browser