theca folliculi

(redirected from Theca externa)
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theca folliculi

[′thē·kə fə′lik·yə·lī]
(histology)
The capsule surrounding a developing or mature Graafian follicle; consists of two layers, theca interna and theca externa.
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Differential steroid production between theca interna and theca externa cells: A three-cell model for follicular steroidogenesis in avian species.
The oocyte wall was consisted of an outer covering, theca externa, median layer of granulosa and the inner layer of zona radiata (Non-cellular) (Fig.
However, it has been proposed to originate from perifollicular myoid stromal cells that are normally present in the theca externa.
The theca externa forms the third layer of the follicle wall.
Moreover, ER immunoreactions were demonstrated in chicken white follicles and outer theca externa and granulosa cells of the F3 follicle (Yoshimura et al.