ANATOMY

Detailed explanation-1: -A time-line for in vitro development shows that stage 3 begins at about 90 hours and by 144 hours a hatched embryo has formed. During this stage the embryo becomes divided into outer trophoblast cells and inner embryoblasts, or inner cell mass, that will develop into the embryo proper.

Detailed explanation-2: -Day 3 Embryo Grading: Quality of Division Day 3 embryos are referred to as “cleavage stage” embryos. The reason for this designation is that the cells in the embryo are dividing (or cleaving) but the embryo itself is not growing in size.

Detailed explanation-3: -Month Three of Pregnancy By the end of the third month of pregnancy, your baby is fully formed. Your baby has arms, hands, fingers, feet, and toes and can open and close its fists and mouth. Fingernails and toenails are beginning to develop and the external ears are formed. The beginnings of teeth are forming.

Detailed explanation-4: -We have noticed that embryo shape is not uniformly spherical; while some embryos are perfectly round, others appear significantly ovoid or oblong in shape.