Zona

Definition of Zona

Zo´na

n.

1.

A zone or band; a layer.

Zona pellucida
a -	(Biol.) The outer transparent layer, or envelope, of the ovum. It is a more or less elastic membrane with radiating striæ, and corresponds to the cell wall of an ordinary cell. See Ovum, and Illust. of Microscope.
b -	The zona radiata.

Zona radiata
(Biol.) a radiately striated membrane situated next the yolk of an ovum, or separated from it by a very delicate membrane only.

Related Words

anatomical structure, anatomy, bodily structure, body structure, complex body part, general anatomy, structure, zona pellucida, zone, zonula, zonule

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