Cleavage Stage, Ovum

The earliest developmental stage of a fertilized ovum (ZYGOTE) during which there are several mitotic divisions within the ZONA PELLUCIDA. Each cleavage or segmentation yields two BLASTOMERES of about half size of the parent cell. This cleavage stage generally covers the period up to 16-cell MORULA.

Year introduced: 1980

PubMed search builder options

Subheadings:

Restrict to MeSH Major Topic.

Do not include MeSH terms found below this term in the MeSH hierarchy.

Tree Number(s): A16.166

MeSH Unique ID: D002970

Entry Terms:

• Cleavage Stages, Ovum
• Ovum Cleavage Stage
• Ovum Cleavage Stages
• Segmentation Stage, Ovum
• Ovum Segmentation Stage
• Ovum Segmentation Stages
• Segmentation Stages, Ovum

Previous Indexing:

• Cell Division (1966-1979)
• Mitosis (1968-1979)
• Ovum (1966-1979)
• Zygote (1975-1979)

See Also:

• Cell Division

All MeSH Categories
Anatomy Category
Embryonic Structures
Cleavage Stage, Ovum