Overview Of Embryology

Another of Dangerfield's, I'm afraid.

6.3.06

• Ovarian cycle and ovulation.
• Post-fertilisation to implantation.
• Blastocyst.
• Implantation.
-Epiblast (ectoderm) and hypoblast (endoderm).
• Bilaminar disc.
• Implantation and placenta.
• Primary villus formation.
• Secondary villus formation.
• Tertiary villus formation.
• Intervillus space.
• Placental structure.
• Cotyledons.
• Early foetal circulation.
• Late foetal circulation.
• Placental growth.
• Umbilical cord.
• Twins.

Gastrulation
Third week of gestation
• Establishes three germ layers:
1. Ectoderm.
2. Mesoderm.
3. Endoderm.
• Involves formation of primitive streak.

• Trilaminar disc formation.
• Primitive streak.
• Notochord and neuroenteric canal.
• Neural tube and mesoderm.
• Somite and mesoderm.
• Migration of sclerotome.