File:Gray0465.jpg - Revision history

Z8600021: /* Fig. 465. Interior of dorsal half of heart from a human embryo of about thirty days */

2014-08-23T09:26:33Z

Fig. 465. Interior of dorsal half of heart from a human embryo of about thirty days

← Older revision		Revision as of 20:26, 23 August 2014
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	From model by {{His}}		From model by {{His}}

			The atrial canal is at first a short straight tube connecting the atrial with the ventricular portion of the heart, but its growth is relatively slow, and it becomes overlapped by the atria and ventricles so that its position on the surface of the heart is indicated only by an annular constriction (Fig. 466). Its lumen is reduced to a transverse slit, and two thickenings appear, one on its dorsal and another on its ventral wall. These thickenings, or endocardial cushions (Fig. 465) as they are termed, project into the canal, and, meeting in the middle line, unite to form the septum intermedium which divides the canal into two channels, the future right and left atrioventricular orifices.

			The primitive atrium grows rapidly and partially encircles the bulbus cordis; the groove against which the bulbus cordis lies is the first indication of a division into right and left atria. The cavity of the primitive atrium becomes subdivided into right and left chambers by a septum, the septum primum (Fig. 465), which grows downward into the cavity. For a time the atria communicate with each other by an opening, the ostium primum of Bom, below the free margin of the septum. This opening is closed by the union of the septum primum with the septum intermedium, and the communication between the atria is reestablished through an opening which is developed in the upper part of the septum primum; this opening is known as the foramen ovale (ostium secundum of Born) and persists until birth.

Z8600021 at 09:22, 23 August 2014

2014-08-23T09:22:49Z

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	{{His}}		==Fig. 465. Interior of dorsal half of heart from a human embryo of about thirty days==

			From model by {{His}}



	{{Historic Disclaimer}}		{{Historic Disclaimer}}

Z8600021: Z8600021 uploaded a new version of "File:Gray0465.jpg"

2014-08-23T09:21:33Z

Z8600021 uploaded a new version of "File:Gray0465.jpg"

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Z8600021 at 09:20, 23 August 2014

2014-08-23T09:20:48Z

← Older revision		Revision as of 20:20, 23 August 2014
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			{{His}}

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Z8600021 at 09:19, 23 August 2014

2014-08-23T09:19:49Z

← Older revision		Revision as of 20:19, 23 August 2014
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	[[Category:Cardiovascular]] [[Category:Blood Vessel]][Category:~~Chicken~~]]		[[Category:Cardiovascular]] [[Category:Blood Vessel]]
	[[Category:~~Historic Embryology~~]]		[[Category:Historic Embryology]][[Category:Wilhelm His]]
	[[Category:Gray's 1918 Anatomy]]		[[Category:Gray's 1918 Anatomy]]

Z8600021: {{Historic Disclaimer}} {{Gray Anatomy}} Category:Cardiovascular Category:Blood Vessel[Category:Chicken]] Category:Historic Embryology Category:Gray's 1918 Anatomy

2014-08-23T09:18:32Z

{{Historic Disclaimer}} {{Gray Anatomy}} Category:Cardiovascular Category:Blood Vessel[Category:Chicken]] Category:Historic Embryology Category:Gray's 1918 Anatomy

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{{Gray Anatomy}}

[[Category:Cardiovascular]] [[Category:Blood Vessel]][Category:Chicken]]
[[Category:Historic Embryology]]
[[Category:Gray's 1918 Anatomy]]