Lec 6B - Lecture Set 6B Early Development and Axis...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Lecture Set 6B – Early Development and Axis Specification in Mammals (Ch 8 in 9e, Ch 11 in 8e) Mammals- 1. Early development 2. Gastrulation 3. Two Organizers (Node and AVE) 4. A-P Axis 5. D-V Axis 6. L-R Axis Adaptation to develop inside another organism- (a parasite?) (1) Evolution of a reproductive tract (expansion of oviduct to form the uterus) (2) Evolution of a fetal organ (the chorion) capable of absorbing nutrients Figure 8.16 Comparison of early cleavage in (A) echinoderms and amphibians and (B) mammals
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 Figure 8.17 Cleavage of a single mouse embryo in vitro Inner Cell Mass (ICM) Figure 8.20 Hatching from the zona and implantation of the mammalian blastocyst in the uterus
Background image of page 2
3 Figure 8.15 Development of a human embryo from fertilization to implantation The CHORION The embryo does not rely on yolk – a fetal organ that can absorb nutrients from mom is formed – the CHORION develops mostly from trophoblastic cells with some cellular contributions from the ICM it is the fetal portion of the placenta it induces the uterine cells (after implantation) to form the maternal contribution to the placenta, called the decidua (becomes rich in blood vessels that oxygenate and provide nutrients to embryo)
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/11/2010 for the course MCDB 112 taught by Professor Staff during the Spring '08 term at UCSB.

Page1 / 12

Lec 6B - Lecture Set 6B Early Development and Axis...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online