vitelline canal
41sheath — 1. Any enveloping structure, such as the membranous covering of a muscle, nerve, or blood vessel. Any sheathlike structure. SYN: vagina (1). 2. The prepuce of male animals, especially of the horse. 3. A specially designed tu …
42vena — SYN: vein. [L.] v. advehens, pl.venae advehentes collective term for a series of branching channels in the early embryo receiving blood from the umbilical and/or vitelline venous systems and passing the mixed blood to the sinusoids of the live …
43Common cardinal veins — Scheme of arrangement of parietal veins …
44Connecting stalk — Latin pedunculus connectans Code TE E5.11.3.1.1.0.4 The connecting stalk is a yolk sac diverticulum.[1] It is derived from extraembryonic mesoderm.[2] …
45Primary interatrial foramen — Interior of dorsal half of heart from a human embryo of about thirty days. (Ostium primum visible below septum primum, but not labeled.) Latin …
46Foramen secundum — Latin foramen secundum Days 33 Code TE E5.11.1.5.2.1.2 The ostium secundum (or foramen secundum) is a foramen in the septum primum. It should not be confused with the foramen ovale, which is a foramen in the septum secundum …
47CROSSOPTÉRYGIENS — Le terme de Crossoptérygien fut créé par Huxley (1861) pour regrouper les Cladistia, ou Brachioptérygiens (Polypterus , Calamoichthys ) actuels avec divers poissons fossiles, dont les Actinistia, ou Cœlacanthiformes, qui n’étaient alors pas… …
48OISEAUX — On connaît un peu plus de 8 800 espèces d’Oiseaux vivants. Les spécialistes ne sont pas d’accord sur la classification des Oiseaux les plus évolués, les Passereaux. En effet, en raison du très petit nombre de fossiles et des grandes ressemblances …
49umbilical vesicle — noun membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional • Syn: ↑yolk sac, ↑vitelline sac, ↑vesicula umbilicus • Hypernyms: ↑sac * * * noun : the yolk sac of a mammalian …
50yolk sac — noun 1. membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional • Syn: ↑vitelline sac, ↑umbilical vesicle, ↑vesicula umbilicus • Hypernyms: ↑sac 2. membranous structure enclosing the… …
