Podcast
Questions and Answers
What is the consequence of differential growth in an embryo related to the heart?
What is the consequence of differential growth in an embryo related to the heart?
- It results in the formation of a second heart tube.
- It displaces the heart toward the tail of the embryo, positioning it in the chest. (correct)
- It enables the heart to descend into the pericardial cavity.
- It causes the heart to develop in both the cranial and caudal regions simultaneously.
Which structure contributes to the formation of the myocardium?
Which structure contributes to the formation of the myocardium?
- Endoderm
- Splanchnic mesoderm (correct)
- Somatic mesoderm
- Ectoderm
What rare heart condition results from the bilateral heart fields remaining separate?
What rare heart condition results from the bilateral heart fields remaining separate?
- Cardia Bifida (correct)
- Tetralogy of Fallot
- Ectopia Cordis
- Atrial Septal Defect
The caudal region of the heart tube is referred to as which structure?
The caudal region of the heart tube is referred to as which structure?
Which process occurs after the fusion of the endocardial tubes?
Which process occurs after the fusion of the endocardial tubes?
What is the term used for the right-sided bending or rotation of the heart tube?
What is the term used for the right-sided bending or rotation of the heart tube?
Which of the following is NOT a result of differential growth in cardiac development?
Which of the following is NOT a result of differential growth in cardiac development?
What structure forms from the cells of the Sinus Venosus?
What structure forms from the cells of the Sinus Venosus?
What consequence can arise from the failure of the heart to properly loop during its formation?
What consequence can arise from the failure of the heart to properly loop during its formation?
What is the significance of cilia located at the primitive node during early embryo development?
What is the significance of cilia located at the primitive node during early embryo development?
What abnormal condition results in mirror-image positioning of organs within the body?
What abnormal condition results in mirror-image positioning of organs within the body?
During the dextral looping of the heart, which chamber of the heart is positioned more posteriorly?
During the dextral looping of the heart, which chamber of the heart is positioned more posteriorly?
What process in embryonic development leads to the first visible asymmetrical event in the formation of the heart?
What process in embryonic development leads to the first visible asymmetrical event in the formation of the heart?
Which part of the embryo is primarily responsible for the left-right axis specification?
Which part of the embryo is primarily responsible for the left-right axis specification?
What role does the sinus venosus play in the structure of the developing heart?
What role does the sinus venosus play in the structure of the developing heart?
What embryological feature is crucial in establishing asymmetrical patterns of gene expression?
What embryological feature is crucial in establishing asymmetrical patterns of gene expression?
What is the result of the fusion of the coeloms in embryonic development?
What is the result of the fusion of the coeloms in embryonic development?
Which process is involved in bringing the heart tube to its adult position in the thorax?
Which process is involved in bringing the heart tube to its adult position in the thorax?
What type of connective tissue supports the heart tube after the folding process?
What type of connective tissue supports the heart tube after the folding process?
How do the lateral body wall folds contribute to heart development?
How do the lateral body wall folds contribute to heart development?
What is VEGF and its role in heart tube formation?
What is VEGF and its role in heart tube formation?
Which embryonic feature is positioned just ventral to the heart after cranio-caudal folding?
Which embryonic feature is positioned just ventral to the heart after cranio-caudal folding?
What does cranio-caudal folding primarily affect in embryonic development?
What does cranio-caudal folding primarily affect in embryonic development?
What is a consequence of lateral body wall folding on the embryonic structure?
What is a consequence of lateral body wall folding on the embryonic structure?
Flashcards
Differential Growth of Embryo
Differential Growth of Embryo
Different parts of the embryo grow at different rates, causing shifts in the relative positions of organs.
Myocardium Formation
Myocardium Formation
The splanchnic mesoderm forms the myocardium (heart muscle) around the heart tube.
Cardiac Jelly
Cardiac Jelly
A connective tissue secreted by the myocardium.
Epicardium Formation
Epicardium Formation
Signup and view all the flashcards
Ectopia Cordis
Ectopia Cordis
Signup and view all the flashcards
Heart Tube Looping
Heart Tube Looping
Signup and view all the flashcards
Heart Tube Formation
Heart Tube Formation
Signup and view all the flashcards
Heart Tube Regions
Heart Tube Regions
Signup and view all the flashcards
Coelom Fusion
Coelom Fusion
Signup and view all the flashcards
Pericardial Cavity
Pericardial Cavity
Signup and view all the flashcards
Embryo Folding
Embryo Folding
Signup and view all the flashcards
Cranio-caudal Folding
Cranio-caudal Folding
Signup and view all the flashcards
Lateral Folding
Lateral Folding
Signup and view all the flashcards
Septum Transversum
Septum Transversum
Signup and view all the flashcards
Dorsal Mesocardium
Dorsal Mesocardium
Signup and view all the flashcards
Heart Looping
Heart Looping
Signup and view all the flashcards
Dextrocardia
Dextrocardia
Signup and view all the flashcards
Left-Right Asymmetry
Left-Right Asymmetry
Signup and view all the flashcards
Primitive Node Cilia
Primitive Node Cilia
Signup and view all the flashcards
Left-Right Axis Specification
Left-Right Axis Specification
Signup and view all the flashcards
Situs Inversus
Situs Inversus
Signup and view all the flashcards
Sinus Venosus
Sinus Venosus
Signup and view all the flashcards
Study Notes
Chapter 9: Formation and Turning of the Heart Tube
- The cardiovascular system develops early, before it's completely formed
- By week 3, the circulatory system develops to meet the growing embryo's needs
- Heart development occurs from weeks 3 to 5
- Heart fields are mesodermal in origin, positioned anterior to the brain
- Mesodermal cells proliferate to form the septum transversum
- Lateral plate mesoderm splits into splanchnic and somatic layers
- Intraembryonic coelom forms between these layers
- Blood islands develop from endoderm and coalesce into a heart tube
- Endocardial tubes fuse to form a single heart tube
- Cranio-caudal folding moves the heart tube ventrally
- Lateral folding brings heart tubes to the midline
- Heart tube differentiates and loops, forming right and left sides
- Heart tube looping establishes positional consistency
- Differential growth causes displacement toward the tail, then chest
- Myocardium and epicardium form from splanchnic mesoderm
- Cardiac jelly forms from myocardium and becomes the connective tissue
- Epicardium is the inner layer of pericardium
- Ectopia Cordis is rare, heart outside thoracic cavity
- Cardia Bifida is rare, bilateral hearts separate
Regions of the Primitive Heart Tube
- Sinus venosus (paired) receives vitelline and cardinal veins
- Blood from yolk sac, body, placenta
- Primitive atrium develops into right and left atria
- Primitive ventricle and bulbus cordis form the ventricles
- Truncus arteriosus leads to aorta and pulmonary trunk
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
