MEDICAL PHYSIOLOGY

Detailed explanation-1: -It’s now called an embryo. Structures and organs like the neural tube (which later becomes the brain and spinal cord), head, eyes, mouth and limbs form. The embryo’s heart begins to develop and pulse around the sixth week. Buds that will become arms and legs also form around the sixth week.

Detailed explanation-2: -“The embryo is defined as the developing pregnancy from the time of fertilization until the end of the eighth week of gestation, when it becomes known as a fetus, ‘’ says James A. O’Brien, MD, medical director of inpatient obstetrics at Women & Infants Hospital of Rhode Island.

Detailed explanation-3: -After conception, your baby begins a period of dramatic change known as the embryonic stage. This stage runs from the 5th through the 10th week of pregnancy. During this stage, the baby is called an embryo.