Actually, He did get His human sinless nature from Mary.
Since Christ was conceived by the Holy Spirit, He did not receive Adam's Original Sin, so His human nature in its purity comes from Mary.
The man is the transmitter of Sin nature, the woman is only the carrier.
Ofcourse, as God, He wasn't conceived.
He had two natures, Human and Divine, Mary is the mother of the human nature, not the Divine one.
This is the Nestorian heresy.