Implantation & Gastrulation PDF

Summary

This document provides information about the stages of implantation and gastrulation in the human embryo. It includes diagrams and explanations of cell movements crucial during these processes. 

Full Transcript

Blastocyst hatching from zona pellucida 1. Zona pellucida 2. Trpphoblast Implantation 3. Hypoblast of inner cell mass 4. Blastocoele...

Blastocyst hatching from zona pellucida 1. Zona pellucida 2. Trpphoblast Implantation 3. Hypoblast of inner cell mass 4. Blastocoele 5. Epiblast of inner General Gastrulation cell mass Embryology Lec 6 Department of Anatomy & Embryology Faculty of Veterinary Medicine Cleavage : utrine tube. implantation ‫ تعمل‬uterus‫ورايحة الـ‬ ‫مهمه لالمتحان‬ ‫هتتطلع منها‬ ‫محصلش لسه‬ ‫هتتقسم اتنني‬ ‫نهاية الـ ‪cleavage‬‬ ‫مهمة واالمثلة مهمة لالمتحان‬ implantation ‫لم يحدث‬ 🫡 ‫مش مطا َلبني بحفظ االرقام‬ Syncytial trophoblast ‫معناها ان ‪blastocyst‬‬ ‫دخلت كلها جوا الـ ‪uterus‬‬ ‫مش بيحصل ‪ bleeding‬مجرد ان املشيمة‬ ‫بتتفك وبتنزل بسرعة‬ ‫ذوات الحوافر‪.‬‬ ‫عموما الحيوانات‬ The end result of cleavage Formation of modified blastula consists of epiblast (dorsal), hypoblast (ventral) and blastocoele in between. A) Formation of hypoblast layer The hypoblast formed as a one layer of cells Later, it will form the extraembryonic endoderm of the yolk sac. FM B) Formation of epiblast layer - It is the one layer cells of the upper layer form embryo C) Formation of blastocoele Blastocyst hatching from zona pellucida Expan 1. Zona pellucida Emb 2. Trpphoblast 3. Hypoblast of inner cell mass 4. Blastocoele 5. Epiblast of inner cell mass inner cell mass ‫من الـ‬ Note th ‫دا لو بترسم مع نفسك وتشغبط 🫵🫵‬ ‫هيكملوا‬ ‫معانا‬ ‫‪ ٣‬طبقات‬ ‫مش ‪٢‬‬ ‫مسؤلني عن التغذية وغيرها في محاضرة‬ ‫تانيه‬ ‫تنسلخ طبقة منهم ويبقى اسمها ‪hypo‬‬ cross section ‫كل الصور‬ ‫واللي يتبقى منها يكون اسمه‪:‬‬ ‫من الـ‪epiblast‬‬ ‫و دي مصيرها تكون الـ‪endoderm‬‬ ‫و دا اللي هيدي الجهاز العصبي‪.‬‬ ‫ودا هيدي الـ‪musculoskeletal‬‬ ‫بشكل عام هي حركة للخاليا وان الـ‪ inner cell mass‬ازاي يعملوا اللي مطلوب‬ ‫منهم‬ ‫مثال ‪eye,ear‬‬ ‫و دا بيحصل للـ ‪inner cell mass‬‬ ‫وتكون ال‪ ٣‬طبقات اللي هتكون الجنني كله بالعضالت‬ ‫واالجهزة إلى آخره‪.‬‬ Gastrulation During gastrulation the bilaminar disc (epiblast & hypoblast) form the trilaminar disc (ecto, meso & endo). The morphogenic process that gives off 3 germ layers; namely the outer layer (ectoderm), middle layer (mesoderm), and the inner layer (endoderm). Occurs in 2 main stages; ‫❖هتتسأل عن االسمني‬Formation of the ectoderm and endoderm by delamination. !!!!‫مهمني‬ ❖ Formation of the mesoderm by involution of the epiblast cells via the primitive streak. ‫حشو‬ Gastrulation Sequence 1. From the ICM, cells proliferate, delaminate, and migrate to form a new cell layer called "hypoblast", and the remaining inner cell mass called "epiblast". 2. Separation of the hypoblast layer from the epiblast establishes a space deep to primitive streak, this space is then temporarily filled by the mesoderm. “Involution” 3. The embryonic disc at surface (epiblast circular then oval+ hypoblast), and a thickened primitive streak (defines the longitudinal axis) is gastrolation‫دا بداية الـ‬ formed at the caudal end of the disc. ‫املهم اعرف ان االشكال دي بتاخد أوردرات مختلفة المتكن مختلفة بس مش مطالب بالرسم‬ ‫بس دي مهمه‬ Gastrulation includes extensive cell shape changes, rearrangement, movement and changes in the adhesive properties of the germ cells.

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