2014 Group Project 5

2014 Student Projects
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The Group assessment for 2014 will be an online project on Fetal Development of a specific System. This page is an undergraduate science embryology student and may contain inaccuracies in either description or acknowledgements.

Cardiovascular

--Mark Hill (talk) 15:16, 26 August 2014 (EST) OK you have some headings, how about some content, references, sources for each section. See Lab 3 Assessment.

Introduction

• The cardiovascular system is one of the first systems to function within the embryo
• The heart begins to function during the 4th week

[Textbook- Larsen's Human Embryology, 4th ed.]

Timeline

--Z3418340 (talk) 00:21, 27 August 2014 (EST)

(From Textbook- Larsen's Human Embryology, 4th ed. - http://www.mdconsult.com.wwwproxy0.library.unsw.edu.au/books/page.do?eid=4-u1.0-B978-0-443-06811-9..10012-0&isbn=978-0-443-06811-9&uniqId=462162262-2#4-u1.0-B978-0-443-06811-9..10012-0--fig42)

Primordial heart tube

• Arises predominantly from splanchnic mesoderm in the cardiogenic region
• Initially bilateral, the cardiogenic region cranially merges to form a horseshoe
• During the third week (Approximately day 18), angioblastic chords develop in the cardiogenic mesoderm. It forms the bilateral endocardial heart tubes
• Lateral folding of the embryo brings the heart tubes into the ventral midline.
• Fusion of the heart begins cranially and extends caudally.
• Certain dilations appear in the heart tube including:
  • Truncus arteriosus
  • Bulbus cordis
  • Primordial ventricle
  • Primordial atrium
  • Sinus venosus (further divided into right horn and left horn)

Heart tube looping

• Most looping occurs in the fourth week of development and is completed by the fifth.
• The straight heart tube begins to elongate, most notably with growth in the bulbus cordis and primitive ventricle.
• This causes the heart to bend ventrally and rotate to the right- this forms a C-shaped loop.
• The ventricular bend moves caudally. The distance between outflow and inflow tracts diminishes
• The inflow (atrial) and outflow tracts converge. Myocardial cells are added forming the truncus arteriosus.

Historic Findings

https://www.youtube.com/watch?v=WXLPxjJszio

--Z3418340 (talk) 00:21, 27 August 2014 (EST)