Medical Terminology Glossary

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zona fasciculata - middle zone of the adrenal cortex; consists of cells arranged in long, straight cords; secretes glucocorticoid hormones

zona glomerulosa - outer zone of the adrenal cortex, directly under the connective tissue covering; consists of cells arranged in arched loops or round balls; secretes mineralocorticoid hormones

zona pellucida - a gelatinous glycoprotein layer internal to the corona radiata; surrounds a secondary oocyte

zona reticularis - inner zone of the adrenal cortex; consists of cords of branching cells that secrete sex hormones, primarily androgens

zygote - a single cell resulting from union of a male and female gamete; a fertilized ovum

zymogenic - one of the cells of a gastric gland that secretes the principal gastric enzyme precursor, pepsinogen; also called a peptic cell