egg membrane
egg membrane The layer of material that covers an animal egg cell. Primary membranes develop in the ovary and cover the egg surface in addition to the normal plasma membrane. The primary membrane is called the vitelline membrane in insects, molluscs, birds, and amphibians, the chorion in tunicates and fish, and the zona pellucida in mammals. Insects have a second thicker membrane, also called the chorion. Secondary membranes are secreted by the oviducts and parts of the genital system while the egg is passing to the outside. They include the jelly coat of frogs' eggs and the albumen and shell of birds' eggs.
More From encyclopedia.com
Eggs , Eggs
One of the few references to the egg in the Bible, and the only injunction connected with it, is the command to drive away the dam before taking… Supernormal Stimulus , supernormal stimulus
1. (in animal behaviour) A stimulus that produces a more vigorous response than the normal stimulus eliciting that particular re… Schnitzel , schnitzel •hassle, Kassel, passel, tassel, vassal •axel, axle •cancel, hansel, Hänsel, Mansell •transaxle •castle, metatarsal, parcel, tarsal •chance… Nissin Food Products Company Ltd. , nit •acquit, admit, backlit, bedsit, befit, bit, Brit, Britt, chit, commit, demit, dit, emit, fit, flit, frit, git, grit, hit, intermit, it, kit, kni… Reproduction , An essential attribute of any species or population is the ability to produce a succeeding generation. As the first vertebrates to set foot on land,… oviduct , o·vi·duct / ˈōviˌdəkt/ • n. Anat. & Zool. the tube through which an ovum or egg passes from an ovary. DERIVATIVES: o·vi·du·cal / ˌōvəˈdoōkəl/ adj. o·…
About this article
egg membrane
All Sources -
You Might Also Like
NEARBY TERMS
egg membrane