*EMBRYONIC DEVELOPMENT IN DAYS*🤰

🧩WEEK 1
👉Day 1 -Fertilization
👉Day 2 – Two Cell Stage
👉Day 3 – Morula
👉Day 4 – Early Blastocyst
👉Day 5 – Late Blastocyst
👉Day 6 -7 – Events during the first week: Fertilization to Implantation

🧩WEEK 2
👉Day 8 – Bilaminar Disc Forms
👉Day 9 – Trophoblast with Lacunae
👉Day 10 – 11- Embryo in Uterus 10-11days after ovulation
👉Day 12- Extraembryonic Mesoderm Develops
👉Day 13- Uteroplacetal Circulation begins
👉Day 14 – Embryonic Disc

🧩WEEK 3
👉Day 15 – Laterality Established
👉Day 16 – Gastrulation: Formation of Germ layers
👉Day 17 – Epiblast forms germ layers
👉Day 18- Trilaminar embryonic disc
👉Day 19 – CNS Induction
👉Day 20 – Neurulation: Neural folds elevate
👉Day 21 – Transverse section through somite region

🧩WEEK 4
👉Day 22 – Neural Tube closure begins
👉Day 23 – Neural Tube Zippers
👉Day 24 -25 – Villus formation continues in the placenta
👉Day 26 – Pharyngeal Arches present
👉Day 27 – Number of somites increases
👉Day 28 – Neurulation
completes

🧩WEEK 5
👉Day 29 – Arm and leg buds forms
👉Day 30 – Development of the face
👉Day 31 – Development of the Gut
👉Day 32 – Presence of embryo in the chorionic cavity
👉Day 33 – formation of the Umbilical Ring
👉Day 34 – Optic cup and lens placode
👉Day 35 Branchial Arches and clefts

🧩WEEK 6
👉Day 36 – Physiological Umbilical Hernia
👉Day 37 Developing Face
👉Day 38 – Muscle Development
👉Day 39 – Endodermal Derivatives
👉Day 40- Auricular Hillocks
👉Day 41 – Atrial Septum formation
👉Day 42 – Digit formation

🧩WEEK 7
👉Day 43 – Limb cartilages and digital rays
👉Day 44 – Developing face
👉Day 45 – Conotruncal and Ventricular Septa
👉Day 46 & 47 – External Genitalia
👉Day 48 – Facial prominence fused
👉Day 49 – Digits present eyelids forming.

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