part of part of in taxon contributes to morphology of Mus <genus> adrenal cortex adrenal gland X zone A transient cortical layer juxtaposed to the medulla and the zona reticularis; in males, this zone rapidly involutes at the onset of puberty whereas this zone persists in females until the first pregnancy or later in adulthood in non-pregnant females. juvenile zone UBERON:0009024 MA:0001888 X zone SCTID:24306004 x-zone adrenal gland cortex zone