Whether the flesh of Christ was conceived of the Virgin's purest blood?

Objections

Objection 1 : It would seem that the flesh of Christ was not conceived of the Virgin's purest blood: For it is said in the collect (Feast of the Annunciation) that God "willed that His Word should take flesh from a Virgin." But flesh differs from blood. Therefore Christ's body was not taken from the Virgin's blood.
Objection 2 : Further, as the woman was miraculously formed from the man, so Christ's body was formed miraculously from the Virgin. But the woman is not said to have been formed from the man's blood, but rather from his flesh and bones, according to Gn. 2:23: "This now is bone of my bones, and flesh of my flesh." It seems therefore that neither should Christ's body have been formed from the Virgin's blood, but from her flesh and bones.
Objection 3 : Further, Christ's body was of the same species as other men's bodies. But other men's bodies are not formed from the purest blood but from the semen and the menstrual blood. Therefore it seems that neither was Christ's body conceived of the purest blood of the Virgin.