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Chapter-10 Development of Cardiovascular System

BOOK TITLE: Embryology for Medical Students

Author
1. Sant Sudhir
ISBN
9788184483673
DOI
10.5005/jp/books/10252_10
Edition
2/e
Publishing Year
2008
Pages
46
Author Affiliations
1. BJ Medical College, Pune, India
Chapter keywords

Abstract

Two endothelial heart tubes develop and fuse with each other to form a single heart tube with bifid caudal end. Parts of the heart tube from cranial to caudal end and their derivatives as follows: 1. Truncus arteriosus: Pulmonary trunk and ascending aorta. 2. Bulbus cordis: Outflowing part of both the ventricles. 3. Ventricles: Inflowing part of the both the ventricles. 4. Atrium: Rough part of both the atria. 5. Sinus venosus: Left horn forms the coronary sinus. Rest of the sinus venosus forms smooth part of right atrium. Upper part of the septum develops from septum secundum: Lower part develops from septum primum. Upper part from right and left bulbar ridges. Lower part from bottom of common ventricular chamber, as muscular part. Intermediate membranous part from proliferation of right and left bulbar ridges and A.V. cushion. Primitive veins and their derivatives: Two vitelline veins with their three anastomosing channels form portal vein and its right and left branch. Cardinal veins: Two anterior cardinal veins with an anastomosis between them forms internal jugular veins, brachiocephalic veins and superior vena cava. Two posterior cardinal veins are joined by two other veins-supracardinal and subcardinal veins. All these veins with anastomosing channels between them form most of the veins of the abdomen e.g. inferior vena cava, renal veins, suprarenal veins, gonadal veins and common iliac veins. 1. Right and left third arch arteries form common carotid artery, external carotid artery and internal carotid artery on either side. 2. Fourth arch artery on left side forms part of arch of aorta: while further arch artery on right side forms part of subclavian artery. 3. Sixth arch artery on right side forms right pulmonary artery: while left sixth arch artery forms left pulmonary artery and ductus arteriosus.

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