Prof. Dr. Hassan Ibrahim El-Sayyad

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Prof. Dr. Hassan Ibrahim El-Sayyad Third Year EMBRYOLOGY Prof. Dr. Hassan Ibrahim El-Sayyad

Embryonic development of amphioxus Fertilization : External. Types of Egg: According to amount of yolk oligolecithal. According to distribution ; homolecithal. Types of cleavage: Equal holoblastic cleavage. Embryonic Development: a. Cleavage: First: vertical 2 Second : vertical 4 Third : Meridional 8 Fourth : 2 latitudal 16 Fifth : 2 Meridional 32 Sixth :64 Seventh : 128

Blastulation: Blastula stage is a ball of cells that excceds more than 256 blastomeres. The blstoderm formed of one cell layer thick. The blastocoele enclosed almost the central cavity . Gastrulation: This occurred as a result of different cell movements simply by epiboly , invagination & involution.

Blastula

Gastrulation

Gastrula of amphioxus