X zone

(redirected from androgenic zone)

X zone

1. a transient adrenocortical zone present in some rodents at birth, most notably in mice, situated between the zona reticularis and the suprarenal medulla; it degenerates in males with the secretion at puberty and in females during their first pregnancy; it slowly enlarges in unmated females after puberty and does not degenerate until middle age; the X zone appears to secrete no hormone; Synonym(s): androgenic zone (1)
2. misnomer for the fetal suprarenal cortex of primates. Synonym(s): fetal reticularis (3)