MBBS Q

 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

@bscnursingstudent_all