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Midbodies and beaded threads.

R Bellairs, M Bancroft

The American Journal of Anatomy

|July 1, 1975

Summary

This summary is machine-generated.

Newly discovered beaded threads in chick embryos connect daughter cells after mitosis. These structures, remnants of telophase bridges, suggest incomplete cell separation following cell division.

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Area of Science:

Cell Biology
Developmental Biology
Microscopy Techniques

Background:

Cell division (mitosis) is fundamental to development.
Understanding intercellular connections is crucial for developmental processes.

Purpose of the Study:

To investigate the nature and origin of unusual thread-like structures observed on the dorsal surface of chick embryos.
To determine the cellular components and potential function of these observed structures.

Main Methods:

Scanning Electron Microscopy (SEM) for visualizing surface structures.
Transmission Electron Microscopy (TEM) for examining ultrastructure of specific components.
Analysis of cellular connections in early chick embryos.

Main Results:

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Long, beaded threads were observed connecting distant cells on the embryo surface.
Bead-like structures within the threads were identified as midbodies.
Threads contained longitudinally arranged structures resembling remnants of mitotic spindle microtubules.

Conclusions:

The beaded threads are identified as remnants of telophase bridges.
These bridges represent incomplete separation of daughter cells after mitosis.
The findings offer insights into post-mitotic cellular connections and potential functions.