Muscle Tear Definition. Pulled muscles, tearing of the muscle fiber and muscle strains are common injuries, usually occurring during a sporting activity. These three names designate one and the same clinical condition, but reflect different degrees of straining muscles.uscle Tear Definition. Pulled muscles, tearing of the muscle fiber and muscle strains are common injuries, usually occurring during a sporting activity. These three names designate one and the same clinical condition, but reflect different degrees of straining muscles.
Noun. 1. egg yolk-the yellow spherical part of an egg that is surrounded by the albumen. yolk. fixings, ingredient-food that is a component of a mixture in cooking; the recipe lists all the fixings for a salad. eggs, egg-oval reproductive body of a fowl (especially a hen) used as food.
The yolk sac is a membranous sac attached to an embryo, formed by cells of the hypoblast adjacent to the embryonic disk. This is alternatively called the umbilical vesicle by the Terminologia Embryologica (TE), though yolk sac is far more widely used.rtificially colored, showing gestational sac, yolk sac and embryo (measuring 3 mm as the distance between the + signs). The yolk sac is the first element seen in the gestational sac during pregnancy, usually at 3 days gestation.