Zonula

Zonula is a term used in anatomy to refer to small bands, belts, or zones. The term is often used in the context of the eye, where it refers to the zonula of Zinn or the zonule of the eye.

Zonula of Zinn

The Zonula of Zinn (also known as the zonule of the eye) is a ring of fibrous strands forming a zonule (little band) that connects the ciliary body with the crystalline lens of the eye. These fibers, sometimes collectively referred to as the suspensory ligaments of the lens, are made up of fine transparent fibrils. They are responsible for holding the lens in place.

Zonula occludens

Another use of the term zonula is in the context of cell biology, where it refers to the zonula occludens, also known as the tight junction. The Zonula occludens is a type of cell junction that serves as a barrier to prevent the passage of molecules and ions through the space between cells.

Zonula adherens

The Zonula adherens is another type of cell junction, which connects the actin cytoskeletons of neighboring cells together. It is particularly important in tissues where strong adhesion between cells is necessary, such as in the epithelium.

See also

• Zonula ciliaris
• Zonula optica

Zonula Resources
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