Lecture #23 Embryology of the Cardiovascular & Lymphatic Systems Flashcards
Where does the heart develop from?
the mesoderm
Heart develops in the cardiogenic mesoderm anterior foregut and caudal to the oropharyngeal membrane
What does the pericardial coelom divide to?
– a ventral splanchnic layer
– a dorsal somatic layer
The splanchnic layer of the cardiogenic mesoderm, mesenchymal cells form two thin walled endocardial tubes called _______________.
the primitive heart tubes
The endocardium is derived from where?
Derived from the endothelial
cells lining the primitive heart tube
_____________ is formed from the splanchnic medoderm.
Myocardium
Where is the epicardium derived from?
Derived from mesothelial cells from the sinus venosus plus thickening of the splanchnic mesoderm
What is the direction of blood flow in the primitive heart tube?
Sinus Venosus → Primordial Atrium → Primodial Ventricle → Bulbous Cordis → Truncus Arteriosus.
At birth, the increased pressure on the left side pushes the ______________ against the ______________, closing the foramen ovale and completing the atrial septum.
septum primum against the septum secundum
What does the right and left horn of the sinus venous develop into?
Right horn: Smooth part of the right atrium (Sinus Venarum)
Left horn: Coronary sinus
What is derived from the Bulbs Cordis?
Conus Arteriosus on the right and Aortic Vestibule on the
left are derived from the Bulbus Cordis
(Smooth walled parts of the ventricles)
Trabeculae Carneae and papillary muscles are derived from ______________.
Rough walled part of the ventricles:
Trabeculae Carneae and papillary muscles are derived from the Primitive Ventricle
The truncus arterioles and partitions into what and is derived from where?
The Aorticopulmonary Septum is a spiral septum that divides the Truncus Arteriosus into Ascending Aorta and Pulmonary Trunk. This is derived from neural crest cells that have migrated to the area (truncal ridges).
The sinus venous forms:
A. pectinate muscles
B. trabeculae carneae
C. Ascending Aorta and Pulmonary Trunk
D. Conus arteriosus and Aortic vestibule – smooth part of ventricles
E. Smooth part of right atrium, Coronary sinus, and SA Node
E. Smooth part of right atrium, Coronary sinus, and SA Node
The Primordial Atrium forms?
A. Rough part of right and left atrium (pectinate muscles)
B. Rough part of right and left ventricles (trabeculae carneae)
C. Ascending Aorta and Pulmonary Trunk
D. Conus arteriosus and Aortic vestibule – smooth part of ventricles
E. Smooth part of right atrium, Coronary sinus, and SA Node
A. Rough part of right and left atrium (pectinate muscles)
The Primordial Ventricle forms?
A. pectinate muscles
B. trabeculae carneae
C. Ascending Aorta and Pulmonary Trunk
D. Conus arteriosus and Aortic vestibule – smooth part of ventricles
E. Smooth part of right atrium, Coronary sinus, and SA Node
B. Rough part of right and left ventricles (trabeculae carneae)
