(1950 Class Video) Heart embryology video

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

During early heart development, what structural change allows the embryonic ventricle to move to the right of the midline?

  • Rapid longitudinal growth of the cardiac tube. (correct)
  • Expansion of the venous channels.
  • Contraction of the arterial trunks.
  • Formation of the atrioventricular canal.

What is the origin of the right and left atria during the early stages of heart development?

  • The interventricular groove.
  • The truncus arteriosus.
  • Lateral circulations. (correct)
  • The bulbo conus.

Which structure does the embryonic right ventricular region (bulbo conus) directly communicate with during early heart development?

  • The interventricular groove.
  • The left ventricle.
  • The right atrium.
  • The truncus arteriosus. (correct)

What is the crucial separating structure in partitioning the atria and ventricles?

<p>Deep groove. (C)</p> Signup and view all the answers

What is the direct consequence of the atrio-ventricular groove constricting the atrio-ventricular canal during heart development?

<p>Endocardial cushions fuse to divide the channel between the atrium and ventricle. (B)</p> Signup and view all the answers

During septal development, what is the immediate effect of the interatrial septum growing towards the endocardial cushions?

<p>Constriction of the foramen primum. (C)</p> Signup and view all the answers

What is the primary function of the foramen secundum during heart development?

<p>To shunt blood from the right atrium to the left atrium. (C)</p> Signup and view all the answers

What role does the septum primum play in fetal heart circulation?

<p>It acts as a unidirectional flutter valve, allowing blood flow from the right atrium to the left. (B)</p> Signup and view all the answers

Which combination of structures partitions the common atrio-ventricular canal?

<p>Endocardial cushions, the interventricular septum, and the interatrial septum. (A)</p> Signup and view all the answers

What structure is formed by the fusion of ridges that spiral down the truncus arteriosus?

<p>Spiral septum. (A)</p> Signup and view all the answers

Endocardial tissue from which structures contributes to the obliteration of the interventricular foramen?

<p>The ventricular septum, endocardial cushions, and the spiral aortic septum. (D)</p> Signup and view all the answers

How many degrees does the aortic pulmonary septum spiral to align with the superior margin of the interventricular septum?

<p>180 degrees. (D)</p> Signup and view all the answers

In the final structure of the heart, where does blood from the left ventricle enter and pass in relation to the pulmonary artery?

<p>Enters the aorta, passing behind the pulmonary artery. (D)</p> Signup and view all the answers

Where does blood from the right ventricle enter, and how does it pass in relation to the aorta in the final heart structure?

<p>Enters the pulmonary artery, passing in front of the aorta, turning posteriorly on the left side. (B)</p> Signup and view all the answers

During fetal circulation, where does blood from the superior and inferior vena cava flow after entering the heart?

<p>Right atrium. (D)</p> Signup and view all the answers

During fetal circulation, what is the primary route taken by the majority of blood ejected into the pulmonary artery?

<p>Through the ductus arteriosus into the descending aorta. (C)</p> Signup and view all the answers

What physiological condition limits blood flow into the pulmonary arteries during fetal circulation?

<p>High resistance in the collapsed lungs. (B)</p> Signup and view all the answers

How does oxygenated blood from the placenta reach the left atrium in fetal circulation?

<p>Through the foramen ovale from the inferior vena cava and right atrium. (C)</p> Signup and view all the answers

Which vessels are primarily supplied with oxygenated blood in fetal circulation after it passes through the left ventricle?

<p>Carotid arteries. (B)</p> Signup and view all the answers

What happens to pulmonary blood flow immediately after delivery and lung inflation?

<p>Increases due to decreased resistance. (A)</p> Signup and view all the answers

What is the direct effect of the constriction of the ductus arteriosus after birth?

<p>Diversion of right ventricular output into the pulmonary circulation. (A)</p> Signup and view all the answers

How is the partitioning of the heart functionally completed after birth?

<p>Increased pressure in the left atrium causing the valvula to press over the foramen ovale. (A)</p> Signup and view all the answers

Which event initiates partition of the heart?

<p>Development of three septa. (B)</p> Signup and view all the answers

Where is the future left ventricle located?

<p>To the left of the interventricular groove. (B)</p> Signup and view all the answers

What structures fuse together, dividing the channel between the atrium and ventricle?

<p>Endocardial cushions. (D)</p> Signup and view all the answers

What opens before the closure of the foramen primum?

<p>Foramen secundum. (C)</p> Signup and view all the answers

What structure develops to the right of the septum primum, forming the foramen ovale?

<p>Septum secundum. (C)</p> Signup and view all the answers

Which septum splits the truncus arteriosus and conus region into the aorta and pulmonary artery?

<p>Spiral septum. (B)</p> Signup and view all the answers

What structure is obliterated by endocardial tissue from the ventricular septum, endocardial cushions, and the spiral aortic septum?

<p>Interventricular foramen. (C)</p> Signup and view all the answers

What structure does a major portion of blood continue through from the pulmonary artery?

<p>Ductus arteriosus. (C)</p> Signup and view all the answers

During fetal circulation, via which structure does oxygenated blood from the placenta enter the inferior vena cava?

<p>Umbilical Vein. (A)</p> Signup and view all the answers

What factor leads to increased pressure in the left atrium, causing the valvula to press over the foramen ovale, after delivery?

<p>Lung Inflation. (D)</p> Signup and view all the answers

What causes the right ventricle output to be diverted into the pulmonary circulation after birth?

<p>Constriction of the ductus arteriosus. (C)</p> Signup and view all the answers

Which route does the blood take from the left ventricle, relating to the position of the pulmonary artery?

<p>Blood enters the aorta, passing to the right behind the pulmonary artery. (B)</p> Signup and view all the answers

Prior to the formation of the four-chambered heart, which of the following structures does not require partitioning?

<p>The Spinal Column. (D)</p> Signup and view all the answers

During fetal circulation, why is it important that oxygenated blood from the placenta primarily supplies the brain?

<p>To ensure optimal neurological development when other organs get less oxygenated blood. (B)</p> Signup and view all the answers

Why must the foramen ovale close after birth?

<p>To ensure that oxygenated and deoxygenated blood do not mix. (D)</p> Signup and view all the answers

What is the purpose of blood being shunted away from the lungs through the ductus arteriosus during fetal circulation?

<p>To bypass the non-functional lungs and direct blood to the systemic circulation. (A)</p> Signup and view all the answers

Flashcards

Early Heart Tube

The heart begins as a simple tube anchored by arterial trunks at one end and venous channels at the other.

Ventricular Looping

The embryonic ventricle bends into a loop to the right of the midline.

Atria Formation

Lateral circulations develop into the right and left atria.

Atrio-ventricular Groove

Separates the atrium from the ventricle during heart development.

Signup and view all the flashcards

Atrio-ventricular Canal

Channels that are divided by endocardial cushions, partitioning the atria and ventricles.

Signup and view all the flashcards

Endocardial Cushions

These fuse to divide the channel between the atrium and ventricle.

Signup and view all the flashcards

Interventricular Septum

A muscular structure that grows across the common ventricle.

Signup and view all the flashcards

Foramen Secundum

An opening that shunts blood from the right atrium to the left atrium in the developing heart.

Signup and view all the flashcards

Septum Secundum

Develops to the right of the septum primum and forms the foramen ovale.

Signup and view all the flashcards

Septum Primum

Acts as a one-way valve, allowing blood flow from the right atrium to the left atrium.

Signup and view all the flashcards

Interventricular Foramen

An opening between the ventricular cavities in the developing heart.

Signup and view all the flashcards

Spiral Septum

Divides the truncus arteriosus into the aorta and pulmonary artery.

Signup and view all the flashcards

Ductus Arteriosus

Connects the pulmonary artery to the aorta in fetal circulation.

Signup and view all the flashcards

Foramen Ovale

Allows oxygenated blood from the placenta to flow from the right atrium to the left atrium, bypassing the lungs.

Signup and view all the flashcards

Pulmonary Vascular Resistance

After birth, lung inflation reduces this, allowing more blood flow to the lungs.

Signup and view all the flashcards

Study Notes

All information in the provided text is already present in the existing notes. No updates are necessary.

Studying That Suits You

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

Quiz Team

More Like This

Congenital Heart Diseases Lecture 1 Quiz
20 questions
Embryology of the Heart Development
10 questions
Heart Development Quiz
47 questions
Use Quizgecko on...
Browser
Browser