Intermediate
Technical
In the Industry Vocabulary Test
Morula
Pronunciation: MORE-you-lah
An early embryonic stage consisting of 16 or more cells that resembles a mulberry cluster.
Full Definition
The morula represents a critical stage in embryonic development, typically occurring on day 4 after fertilization when the embryo consists of 16 or more compacted blastomeres. The name derives from its resemblance to a mulberry. During this stage, cells begin to form tight junctions and establish cell polarity, preparing for blastocyst formation. Morulae are less commonly transferred than blastocysts in modern practice, but their development indicates embryo viability and progression toward the blastocyst stage.
Usage
Usage note: Plural form is morulae.
In Context
- "Five embryos progressed to morula stage by day 4 of culture." — Laboratory report
- "The morula showed excellent compaction indicating normal development." — Embryology assessment
Don't confuse with
blastocyst
cleavage stage embryo