zona

Thân thiện

The zona pellucida surrounds the developing egg cell.

Definition

Noun (Anatomy): An encircling or beltlike structure in the body; a zone or band of distinct tissue.

Usage

This is a specialized anatomical term. It is typically used in medical or biological contexts to describe a specific band-like anatomical feature.

Examples

• The zona pellucida is a glycoprotein layer surrounding the plasma membrane of a mammalian oocyte.
• Under the microscope, the zona fasciculata of the adrenal gland can be clearly identified.
• The egg's protective zona prevents polyspermy.

Advanced Usage

The word 'zona' is almost exclusively used in compound anatomical terms. It is rarely, if ever, used in isolation in modern English outside of these fixed Latin phrases. - zona pellucida: The transparent outer layer of an ovum. - zona glomerulosa: The outermost layer of the adrenal cortex. - zona fasciculata: The middle and largest layer of the adrenal cortex. - zona reticularis: The innermost layer of the adrenal cortex.

Variants and Related Words

• Zone (noun): A more general term for an area or region with a distinct characteristic. While related, "zone" is the common English word, whereas "zona" is a direct Latin borrowing used in specific scientific names.
• Belt (noun): A figurative synonym for a encircling band, but not used in anatomical nomenclature.
• Band (noun): A strip of material or, figuratively, a range or group. Like "belt," it is a conceptual synonym but not a technical replacement.

Synonyms

• Band
• Belt
• Girdle
• Layer (in specific contexts)
• Zone

Notes

This word is a direct loan from Latin, meaning "girdle" or "belt." Its use in English is highly technical and confined to specific compound terms in anatomy and embryology. For general purposes, the word zone is used.

Học thuật

Noun

1. (anatomy) any encircling or beltlike structure

Từ đồng nghĩa

• zone