Development of the Diaphragm
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Questions and Answers

What structure serves as the precursor to the central tendon of the diaphragm?

  • Septum transversum (correct)
  • Lateral body wall
  • Paired pleuroperitoneal membranes
  • Dorsal mesentery of the esophagus
  • Which structure gives rise to the crura of the diaphragm?

  • Septum transversum
  • Pleuroperitoneal membranes (correct)
  • Dorsal mesentery of the esophagus
  • Lateral body wall
  • What do the lateral body wall structures contribute to in diaphragm development?

  • Closure of the pericardioperitoneal canal
  • Development of pleuroperitoneal membranes
  • Formation of the central tendon
  • Muscle supply to peripheral portions (correct)
  • During which weeks do the pleuroperitoneal membranes grow to seal off the pleural cavities from the peritoneal cavity?

    <p>Weeks 5 to 7</p> Signup and view all the answers

    Which of the following represents a function of the dorsal mesentery of the esophagus?

    <p>Contributes to the crura of the diaphragm</p> Signup and view all the answers

    What is the main role of the pleuroperitoneal membranes during diaphragm development?

    <p>Link septum transversum to the posterior body wall</p> Signup and view all the answers

    What do the arrows in the diagram indicate?

    <p>Invasion of the diaphragm by muscle tissue</p> Signup and view all the answers

    What is the primary source of mesoderm for the septum transversum?

    <p>Somatic mesoderm</p> Signup and view all the answers

    What action occurs as the pleuroperitoneal membranes grow?

    <p>Closure of the pericardioperitoneal canal</p> Signup and view all the answers

    What is a critical role of the central tendon in the diaphragm?

    <p>Attachment point for muscle fibers</p> Signup and view all the answers

    Study Notes

    Development of the Diaphragm

    • The diaphragm is a crucial muscle in respiration, it develops from multiple structures.

    Key Structures and Functions

    • Septum transversum: Forms the central tendon of the diaphragm, located between the primitive heart tube and developing liver.
    • Paired pleuroperitoneal membranes: Sheets of somatic mesoderm that form the crura of the diaphragm.
    • Dorsal mesentery of the esophagus: Contributes to the formation of the crura of the diaphragm in the adult.
    • Lateral body wall: Supplies muscle to the peripheral portions of the diaphragm

    Closure of the Pericardioperitoneal Canals

    • During weeks 5 and 7, pleuroperitoneal membranes grow from the posterior body wall to connect with the septum transversum.
    • This closure separates the pleural cavities from the peritoneal cavity.
    • The membranes develop into the posterior portions of the diaphragm.
    • Muscle tissue from the surrounding body wall invades the developing diaphragm.

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    Description

    This quiz explores the development of the diaphragm, a vital muscle in respiration. It covers key structures such as the septum transversum and paired pleuroperitoneal membranes, along with the closure of the pericardioperitoneal canals. Understand the contributions of different anatomical features in diaphragm formation.

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