File:Streeter-plate02.jpg: Difference between revisions

From Embryology
No edit summary
No edit summary
Line 6: Line 6:
(Carnegie Collection, No. 588). Enlarged about 40 diameters.  
(Carnegie Collection, No. 588). Enlarged about 40 diameters.  


This stjige illustrates the character of the first type of the circulation of the head and its relation to the other blood-vessels of the body. The primary head-vein and its tributaries which form the main drainage-channels of the head aie shown in blue. These communicate by anastomosing loops with the capillary plexus everywhere investing the brain-wall, only patches of which are shown in the model. The eapiUarj- plexus of the brain-wall is fed bv arterial feeders, the stumps of which, as shown in the model, arise from the aortic system. The trunk that persists as the internal carotid artery is already quite definite.  
* This stage illustrates the character of the first type of the circulation of the head and its relation to the other blood-vessels of the body.  
* The primary head-vein and its tributaries which form the main drainage-channels of the head as shown in blue.  
* These communicate by anastomosing loops with the capillary plexus everywhere investing the brain-wall, only patches of which are shown in the model.  
* The capillary plexus of the brain-wall is fed by arterial feeders, the stumps of which, as shown in the model, arise from the aortic system.  
* The trunk that persists as the internal carotid artery is already quite definite.  





Revision as of 09:35, 28 August 2011

Plate 2. The developmental alterations in the vascular system of the brain of the human embryo

By George L. Streeter. (five plates and twelve text-figures)

Right and left profile views of a wax-plate reconstruction of the main arteries and veins in a human embryo 4 mm. long (Carnegie Collection, No. 588). Enlarged about 40 diameters.

  • This stage illustrates the character of the first type of the circulation of the head and its relation to the other blood-vessels of the body.
  • The primary head-vein and its tributaries which form the main drainage-channels of the head as shown in blue.
  • These communicate by anastomosing loops with the capillary plexus everywhere investing the brain-wall, only patches of which are shown in the model.
  • The capillary plexus of the brain-wall is fed by arterial feeders, the stumps of which, as shown in the model, arise from the aortic system.
  • The trunk that persists as the internal carotid artery is already quite definite.


--Mark Hill 09:44, 17 February 2011 (EST) Estimated as Carnegie Stage 12 Week 4 on basis of CRL and general appearance.


Plate links: Plate 1 - embryos 4 mm to birth | Plate 2 - embryo 4 mm | Plate 3 - embryo 11.5 mm | Plate 4 - embryo 21 mm | Plate 5 - embryo 43 mm


Historic Disclaimer - information about historic embryology pages 
Mark Hill.jpg
Pages where the terms "Historic" (textbooks, papers, people, recommendations) appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms, interpretations and recommendations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)

Reference

The Developmental Alterations in the Vascular System of the Brain of the Human Embryo Contributions to Embryology Carnegie Institution No.24 by George L. Streeter, with five plates and twelve text-figures (1921).

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current10:21, 21 April 2012Thumbnail for version as of 10:21, 21 April 20121,200 × 871 (180 KB)Z8600021 (talk | contribs)
14:41, 16 February 2011Thumbnail for version as of 14:41, 16 February 20111,200 × 806 (147 KB)S8600021 (talk | contribs)==The developmental alterations in the vascular system of the brain of the human embryo== By George L. Streeter. (five plates and twelve text-figures)