Class Notes (807,646)
Canada (492,772)
Brock University (11,903)
Biology (1,604)
BIOL 2P95 (35)

Lecture 06 Heart Development

2 Pages
Unlock Document

Brock University
Dirk De Clercq

Outline of Lecture 06 Heart Development Heart has a “nervous system”, the conduction system, in addition to spontaneous contractility I. Early heart development - At days 19-21, cardiogenic cords of the splanchnic mesoderm give rise to two endocardial tubes, embryonic folding allows apposition and fusion to form heart tube - Heart tube is surrounded by ventrally located pericardial sac - The cardiac mesentery is the dorsal mesocardium; it disintegrates, leaving heart tube suspended and forming transverse pericardial sinus - Heart tube consists of endothelium, cardiac jelly, myocardium, epicardium (inner to outer) - In week 3, the heart tube loops and fetal blood circulation begins II. Development of the heart - 4 divisions of the heart tube: bulbus cordis, primitive ventricle, primitive atrium, sinus venosus - Right atrium - Primitive atrium  pectinate muscle in right auricle - Sinus venosus  sinus venarum - Left atrium - Primitive atrium  left atrium - Pulmonary veins sprout, branch, and head toward lungs - Interatrial septum - Moon-shaped septum primum separates atria; right-left shunt first provided by foramen primum, then by foramen secundum - Septum secundum forms with foramen ovale shunt (later becomes fossa ovalis) - Together foramen secundum and foramen ovale provide atrial shunt, after birth fusion of septa closes shunt - Left and right
More Less

Related notes for BIOL 2P95

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.