The spindle fibres that are continuous from one pole to another pole of the cell are termed as continuous fibres while those extending from centromere of the chromosome to the pole are called as chromosomal spindle fibres. The spindle fibres present between centromeres of separating chromatids is termed in interzonal fibres. Microtubules that spread out from the centrosome in the opposite direction from the spindle itself are collectively termed as astral rays.

Interzonal Spindle Fibres

Interzonal spindle fibers are one of the three types of spindle fibers that are involved in the process of cell division. These fibers are responsible for the separation of chromosomes during the anaphase stage of mitosis.

Extension of Interzonal Spindle Fibres

The extension of interzonal spindle fibers is from pole to pole, which means that they connect the two poles of the spindle apparatus. These fibers are also known as polar fibers because of their location and function.

Incomplete Nature of Interzonal Spindle Fibres

Interzonal spindle fibers are incomplete, which means that they do not connect to the chromosomes directly. Instead, they overlap with other fibers, such as kinetochore fibers, that attach to the chromosomes.

Function of Interzonal Spindle Fibres

The main function of interzonal spindle fibers is to provide structural support to the spindle apparatus. They help to maintain the shape and stability of the spindle during cell division. Additionally, these fibers play a critical role in the separation of chromosomes by pulling them towards the opposite poles of the spindle.

Conclusion

In conclusion, interzonal spindle fibers are an essential component of the spindle apparatus that ensures the proper separation of chromosomes during cell division. They extend from pole to pole, overlap with other fibers, and provide structural support to the spindle. Understanding the function and properties of interzonal spindle fibers is critical to the study of mitosis and cell division.