What is zona?

Zona is a zone, especially an encircling region distinguished from adjacent parts by some distinctive feature.
z. adherens See zonula adherens.
z. fasciculata The intermediate layer of radially arranged cell cords in the cortex of the adrenal gland, between the zona glomerulosa and zona reticularis; together with the zona reticularis, it is the site of formation of adrenal steroids other than aldosterone.
z. glomerulosa The thin outermost layer of the cortex of the adrenal gland just below the capsule; the site of aldosterone production.
z. granulosa A mass of stratified cuboidal epithelium surrounding the ovum within a vesicular ovarian follicle.
z. incerta The narrow zone of gray matter between the lateral nucleus of the thalamus
and the subthalamic nucleus.
z. occludens See tight junction, under junction.
z. orbicularis of the hip joint The deeper, circularly arranged fibers of the articular
capsule of the hip joint which encircle the neck of the femur.
z. pellucida A refractile, gel-like neutral glycoprotein formed around the developing ovum; it is about 4 µm thick and formed by the mutual interaction of the ovum and follicular granulosa cells; it degenerates and disappears just prior to implantation to the endometrium.
z. reticularis The inner layer of the cortex of the adrenal gland where the cell cords form an irregular network; together with the zona fasciculata, the site of production of adrenal steroids other than aldosterone.
z. vasculosa of Waldeyer The highly vascular stroma in the center of the ovary.

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