Medical Definition of X zone

1. A transient adrenocortical zone present in some rodents at birth, most notably in mice, situated between the zona reticularis and the adrenal 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: androgenic zone. Misnomer for the foetal adrenal cortex of primates. Synonym: foetal reticularis. (05 Mar 2000)

Lexicographical Neighbors of X Zone

X Prize
X body
X chromosomes
X disease
X disease of cattle
X factor
X factors
X inactivation
X linked disease
X mark
X marks
X marks the spot
X out
X ray
X zone (current term)
Xaa
Xaasongaxango
Xalapa
Xamir
Xan
Xanadu
Xanatos
Xanax
Xancidae
Xander
Xandra
Xanthe
Xanthian

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