Lecture 15: Embryonic Development of the Cardiovascular System Flashcards
During the early stages of development the embryo is nourished through
Diffusion from the fluid secreted by the uterine glands into the uterine cavity
Why is there an urgent need for a circulatory system in a developing embryo?
Increase in size and complexity means that diffusion system becomes insufficient.
Cardiovascular system is derived from
Angioblastic tissue, which arises from the mesenchyme, an aggregation of cells from the mesoderm
Process of blood vessel development
angiogenesis
What is the first functional system of the embryo?
Cardiovascular system
Cardiogenic field
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
Cardiogenic cords form
endocardial heart tubes
The caudal portions of the endocardial heart tubes make contact with
The developing venous system
The endocardial heart tubes will give rise to
The heart and dorsal and ventral aortas
The endocardial heart tube is first composed of only ____ cells. Then…
- Endothelial
- The caudal portion fuses and becomes surrounded by myoblasts to form the myocardium (formation of the cardiac tube)
Bulbus cordis is the precursor of the
right ventricle
Loop formation
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
During the partitioning of the atrio-ventricular canal
- 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
What is the most common congenital anomaly in domestic animals
Patent ductus arteriosus
Persistent right aortic arch leads to
megaesophagus
Affected animals often die of aspiration pnuemonia