File:Arey1924 fig374.jpg

Fig. 374. Ventral reconstruction of the cardinal and subcardinal veins in a 6 mm pig embryo

Showing the early development of the inferior vena cava ( Vehe). X 22. In the small orientation figure (cf. Fig. 376) the various jdanes are indicated by broken lines.

The anterior cardinal veins (Figs. 374 and 375) are formed to drain the plexus of veins on each side of the head. These vessels extend caudad and lie ventro-lateral to the myelencephalon. Each receives branches from the sides of the myelencephalon, then curves ventrad, is joined by the linguo-facial vein from the branchial arches and at once unites with the posterior cardinal of the same side to form the common cardinal vein. This, as already explained, opens into the sinus venosus.

A posterior cardinal vein develops dorso-lateral to each mesonephros (Figs. 374 and 375). Running cephalad, they join the anterior cardinal veins. When the mesonephroi become prominent, as at this stage, the middle third of each posterior cardinal is broken up into sinusoids. Sinusoids extend from the posterior cardinal vein ventrally around both the lateral and medial surfaces of the mesonephros. The median sinusoids anastomose longitudinally and form the subcardinal veins, right and left.

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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 27) Embryology Arey1924 fig374.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Arey1924_fig374.jpg

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