vitelline canal
21Placenta — For the ancient Roman bread, see placenta (food). For the placenta of fruit, see placentation. Placenta Placenta Precursor …
22Chorion — For the chorion in invertebrate eggs, see Chorion (egg). Chorion Diagram showing earliest observed stage of human embryo …
23Umbilical artery — Artery: Umbilical artery Fetal circulation; the umbilical vein is the large, red vessel at the far left. The umbilical arteries are purple and wrap around the umbilical vein …
24Dorsal aorta — This article is about the embryonic artery. For the artery in adult fish, see Aorta#In other animals. Dorsal aortae Profile view of a human embryo estimated at twenty or twenty one days old. (Dorsal aorta labeled at center left.) …
25Vessel — A tube in the body that carries fluids: blood vessels or lymph vessels. * * * A structure conveying or containing a fluid, especially a liquid. SEE ALSO: vas. [O. Fr. fr. L. vascellum, dim. of vas] absorbent vessels SYN: lymph vessels. afferent v …
26membrane — 1. A thin sheet or layer of pliable tissue, serving as a covering or envelope of a part, as the lining of a cavity, as a partition or septum, or to connect two structures. SYN: membrana [TA]. 2. SYN: biomembrane. [L. membrana, a skin or m …
27Vein — A blood vessel that carries blood low in oxygen content from the body back to the heart. The deoxygenated form of hemoglobin (deoxyhemoglobin) in venous blood makes it appear dark. Veins are part of the afferent wing of the circulatory system… …
28duct — A tubular structure giving exit to the secretion of a gland or organ, capable of conducting fluid. SEE ALSO: canal. SYN: ductus [TA]. [L. duco, pp. ductus, to lead] aberrant ducts SYN: aberrant ductules, under ductule …
29Human gastrointestinal tract — Alimentary canal redirects here. For animal alimentary canal in general, see Gut (anatomy). Human gastrointestinal tract (Digestive System) Stomach colon rectum diagram The human gastrointestinal tract refers to the stomach a …
30Kystes méningés et Arachnoïdite — Les kystes méningés (Tarlov et variants) sont des excroissances de l’arachnoïde remplies de fluide cerebro spinal, que l’on trouve le plus souvent au niveau sacré par l’intermédiaire d’une IRM. Les kystes méningés, qu’ils soient sacrés, lombaires …
