File:Arey1924 fig197.jpg

Fig. 197. Diagrams to illustrate the transformation of the pre-, post-, sub-, and supracardinal veins

(adapted after Huntington and McClure)

A, 6 mm; B, 10 mm; C,15 mm, D, 18 mm.

The true precardinals communicate during the eighth week by a transverse venous channel which carries the blood from the left side of the head into the right vein (Fig. 197 D). As a result, the left precardinal soon loses its connection with the common cardinal on the same side and degenerates (E). The stump of the left common cardinal comprises the inconstant oblique vein of the left atrium: it also joins with the transverse sinus venosus in forming the coronary sinus. The right common cardinal and the right precardinal, as far as its cross anatomosis, become the superior vena cava. The anatomosis itself forms the left innominate vein, while that portion of the right precardinal between the anastomosis and the right subclavian vein is known as the right innominate. The distal segments of the precardinals become the internal jugular veins of the adult, whereas the external jugular and subclavian veins are vessels which develop somewhat later (C-E).

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Developmental Anatomy 1924: 1 The Germ Cells and Fertilization | 2 Cleavage and the Origin of the Germ Layers | 3 Implantation and Fetal Membranes | 4 Age, Body Form and Growth Changes | 5 The Digestive System | 6 The Respiratory System | 7 The Mesenteries and Coelom | 8 The Urogenital System | 9 The Vascular System | 10 The Skeletal System | 11 The Muscular System | 12 The Integumentary System | 13 The Central Nervous System | 14 The Peripheral Nervous System | 15 The Sense Organs | C16 The Study of Chick Embryos | 17 The Study of Pig Embryos | Figures

Reference

Arey LB. Developmental Anatomy. (1924) W.B. Saunders Company, Philadelphia.

Cite this page: Hill, M.A. (2024, April 19) Embryology Arey1924 fig197.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Arey1924_fig197.jpg

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