Spermatozoan structure

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Presentation transcript:

Spermatozoan structure Nuclear DNA and digestive enzymes to breakdown the outer layers of ovum Neck with mitochondrial DNA Locomotion Head Nucleus Midpiece Tail

Egg & Fertilization Egg plasma membrane Outer protective layers Zona pellucida in mammals Contains receptors for sperm binding Vitelline layer in non-mammals w/outer jelly layer w/receptors Egg plasma membrane w/cortical granules Zona pellucida

Fertilization

Unfertilized; 00:00 Fertilized; 00:02 First Division; 01:30 Second Division; 04:00 Third Division; 16:00 Blastula; 20:00

Cleavage: early cell division Zygote divisions or cleavage cells called blastomeres Reduction of cell size; increases SA/V ratio Radial cleavage Alligned (lat./long.) splits Deuterostomes Spiral cleavage Divides at 90o offset protostomes

Morula blastomeres

Blastula

Gastrula mesoderm blastopore

Coelom Development

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