zona
- noun
- /ˈzoʊnə/
- Specialized
- He studied the zona of the heart.
- zona pellucida
- egg's zona
- sperm pierces the zona
Examples
-
Researchers are studying how the zona influences the process of fertilization in mammals.
-
Certain parasites invade through the zona of a host's tissue.
-
Scientists observed a distinct zona around the affected lymph node.
-
The zona pellucida is a thick membrane surrounding the mammalian egg cell.
-
The zona pellucida surrounds the ovum.
-
During fertilization, the sperm must travel through the zona to reach the egg.
-
The zona acts as a protective barrier around the ovum during reproduction.
Synonyms
Compounds
- Specialized
Middle layer of the adrenal gland that makes the stress hormone cortisol
- Specialized
A clear thick layer around a mammal's egg that sperm must pass through
Surface Forms
Etymology
Zona comes from the old Greek zōnē, meaning 'belt' or 'girdle', so in anatomy a zona is a beltlike or encircling part of the body.