The shell-like covering of the human egg.
the protective surface layer of the egg.
thick membrane around the mammalian ovum; can be penetrated by one sperm in the fertilization process; usually remains around the fertilized egg until it is implanted in the wall of the uterus
The outside covering (shell) of a human egg.
The protective coating around the egg and early embryo.
The tough outer covering of an egg which functions somewhat like a shell. Sperm must penetrate this "shell" in order to fertilize the egg.
the uniform appearing covering of the egg which contains hyaluronic acid and sperm binding sites--the sperm must penetrate this layer in order to reach and fertilize the egg--if fertilization occurs, the embryo forms within the zona pellucida which is thought to be essential for proper cell compaction (close contact between the cells of the embryo) and intercellular communication--at the blastocyst stage (see above), the embryo hatches from its covering zona pellucida prior to implanation in the uterus
The zona pellucida is the protective shell-like coating of the egg.
the outer covering of the egg that sperm must penetrate before fertilisation can occur.
ZO-nah pel-LU-seh-dah A thin, clear layer of proteins and sugars that surrounds a secondary oocyte. 217
The outer protein covering of an egg.
is the translucent, elastic, noncellular layer that acts as a protective coating surrounding the egg.
The protective protein coating surrounding the egg.
The protective coating surrounding the egg. close window
The outer 'shell' surrounding the egg.The Zona Pellucida serves two purposes; firstly allowing only one sperm toenter the egg for fertilization and secondly to hold the cells of the developingembryo together before compaction.
glycoprotein shell that surrounds the oocyte through to blastula stage of development.
The outer covering of the ovum that the sperm must penetrate before fertilization can occur.
The outermost and toughest coating around the egg
The human eggshell; the hard protein covering that protects the egg and subsequently the embryo up to the point of implantation.
zona - a girdle; L. pellucidus - to shine through]. A translucent non-cellular membrane surrounding a mammalian egg through which sperm must penetrate in order for fertilization to occur.
zona pelucida] area around a mammalian egg used to help exclude excess sperm from fertilizing the egg.
The protective outer membrane surrounding an egg or embryo.
hard outer membrane surrounding the unfertilized oocyte
Glycoprotein coat around the oocyte
The zona pellucida (or zona striata in older texts) is a glycoprotein membrane surrounding the plasma membrane of an oocyte. It is a vital constitutive part of the latter, external but not extraneous to it.