yolk cell
121Biotin — Biotin[1] …
122Umbilical cord — of a three minute old child. A medical clamp has been applied. Latin funiculus umbilicalis Code …
123Lecithin — is any of a group of yellow brownish fatty substances occurring in animal and plant tissues, and in egg yolk, composed of phosphoric acid, choline, fatty acids, glycerol, glycolipids, triglycerides, and phospholipids (e.g., phosphatidylcholine,… …
124Umbilical 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 …
125Ductus venosus — Vein: Ductus venosus Fetal circulation. The ductus venosus (red) connects the umbilical vein to the inferior vena cava …
126Foramen ovale (heart) — Not to be confused with ostium secundum. Foramen ovale (heart) Sketch showing foramen ovale in a fetal heart. Red arrow shows blood from the inferior caval vein. HF: right atrium, VF: left atrium. HH og VH: right and left ventricle. The heart… …
127Development of the gonads — The prenatal development of the gonads is a part of the development of reproductive system and ultimately forms the testes in males and ovaries in females. They initially develop from the mesothelial layer of the peritoneum. The ovary is… …
128development — developmental, developmentary, adj. developmentally, adv. /di vel euhp meuhnt/, n. 1. the act or process of developing; growth; progress: child development; economic development. 2. a significant consequence or event: recent developments in the… …
