3B - Uterus & early development - Model UT 1-3 1 Uterine Fundus 1a Left Fallopian Tube 1b Left Proper Ovarian Ligament 2 Uterine cavity 3 Endometrium 4 Myometrium 5 Vagina 5a Vaginal Fornix 6 Corpus hemorrhagicum on left 6 Corpus luteum on right - produces progesterone 7 Corpus albicans 8 Primordial ovarian follicle 9 Primary ovarian follicle 10 Secondary ovarian follicle 11 Graafian follicles 12 Ovary 13 Graafian follicle 14 Ovulation 15 Fertilisation occurs here 16 Spermatazoa 17 ovum with pronuclei 18 Two-cell stage 19 Four-cell stage 20 Fallopian tube 21 Morula 22 Blastocyst 23 Implanted embryo 26 Zona pellucida 27 Ovum (oocyte) 28 Polar Bodies 29 Blastomeres 30 Trophoblasts - become cytotrophoblasts 31 Blastocele 32 Inner Cell Mass 33 Reflex decidua 34 Yolk Sac 34a Epiblast 34b Hypoblast 35 Amniotic Cavity 36 Extraembryonic Mesoderm 37 Coelom (these are cavities which will combine into a larger cavity) 38a Cytotrophoblasts which give rise to 38b 38b Syncytiotrophoblasts which are multinucleated cells that "invade" the uterine wall - will create fetal portion of placenta [3B - Uterus Model - Diagrams 1a] [3B - Uterus Model - Diagrams 1b] [3B - Uterus Model - Diagrams 2a] [3B - Uterus Model - Diagrams 2b] |