Theca Externa Cells (Follicle Wrap Cells)

Long, thin wrapper cells

In the ovary, each growing egg cell sits inside a follicle. Around the follicle are two layers. The outer one is the theca externa.

Its cells are long and thin, like stretched-out threads. They are packed in with strong fibers.

Holding it all together

• They make a strong, stretchy wrap that holds the growing follicle together.
• They help the follicle stay in its place in the ovary.
• Scientists think some of these cells can squeeze a little, which may help when the egg cell is let out.

Theca externa quiz