Teratogen sensitivity

Teratogens are drugs, infectious agents, and environmental factors that cause birth defects. Dark blue signifies the highly sensitive period for an organ or body part; light blue signifies periods of less severe sensitivity. For example, the upper limbs are most sensitive to damage during weeks 4 through 6, and somewhat sensitive during weeks 7 and 8.

defects in physiology; 4— major morphological abnormalities —><— phySlcal abnormalities minor —> weeks: 1 2 3 4 5 6 7 8 9 16 20-36 38 i cleavage‘ implantation insensitivity to teratogens palate forming