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Questions and Answers
What structure serves as the precursor to the central tendon of the diaphragm?
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?
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?
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?
During which weeks do the pleuroperitoneal membranes grow to seal off the pleural cavities from the peritoneal cavity?
Which of the following represents a function of the dorsal mesentery of the esophagus?
Which of the following represents a function of the dorsal mesentery of the esophagus?
What is the main role of the pleuroperitoneal membranes during diaphragm development?
What is the main role of the pleuroperitoneal membranes during diaphragm development?
What do the arrows in the diagram indicate?
What do the arrows in the diagram indicate?
What is the primary source of mesoderm for the septum transversum?
What is the primary source of mesoderm for the septum transversum?
What action occurs as the pleuroperitoneal membranes grow?
What action occurs as the pleuroperitoneal membranes grow?
What is a critical role of the central tendon in the diaphragm?
What is a critical role of the central tendon in the diaphragm?
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.
