Lecture 15: Embryonic Development of the Cardiovascular System

Question 1

During the early stages of development the embryo is nourished through

Answer 1

Diffusion from the fluid secreted by the uterine glands into the uterine cavity

Question 2

Why is there an urgent need for a circulatory system in a developing embryo?

Answer 2

Increase in size and complexity means that diffusion system becomes insufficient.

Question 3

Cardiovascular system is derived from

Answer 3

Angioblastic tissue, which arises from the mesenchyme, an aggregation of cells from the mesoderm

Question 4

Process of blood vessel development

Answer 4

angiogenesis

Question 5

What is the first functional system of the embryo?

Answer 5

Cardiovascular system

Question 6

Cardiogenic field

Answer 6

Horse-shoe shaped structure located around the anterior and lateral portions of the neural plate. Area of blood-forming cavities in the visceral mesoderm where hemangioblasts will eventually coalesce and form the primitive heart, blood vessels, and blood cells

Question 7

Cardiogenic cords form

Answer 7

endocardial heart tubes

Question 8

The caudal portions of the endocardial heart tubes make contact with

Answer 8

The developing venous system

Question 9

The endocardial heart tubes will give rise to

Answer 9

The heart and dorsal and ventral aortas

Question 10

The endocardial heart tube is first composed of only ____ cells. Then…

Answer 10

• Endothelial

- The caudal portion fuses and becomes surrounded by myoblasts to form the myocardium (formation of the cardiac tube)

Question 11

Bulbus cordis is the precursor of the

Answer 11

right ventricle

Question 12

Loop formation

Answer 12

The process that in conjunction with the partition of the primordial heart, will result in the formation of the blood pumping organ that is necessary for the survival of the neonate

Question 13

During the partitioning of the atrio-ventricular canal

Answer 13

• Primitive atrium is divided into left and right atrium
• Primitive ventrical divided into left and right ventricles
• Truncus arteriosus is divided into outflow tracts of the aorta and pulmonary trunks

Question 14

What is the most common congenital anomaly in domestic animals

Answer 14

Patent ductus arteriosus

Question 15

Persistent right aortic arch leads to

Answer 15

megaesophagus

Affected animals often die of aspiration pnuemonia