| Term 
 | Definition 
 
        | cover organs + line trunk cavity |  | 
        |  | 
        
        | Term 
 | Definition 
 | 
        |  | 
        
        | Term 
 | Definition 
 | 
        |  | 
        
        | Term 
 | Definition 
 | 
        |  | 
        
        | Term 
 | Definition 
 
        | lung and thoracic cavity serous membrane |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | abdominopelvic cavity serous membrane |  | 
        |  | 
        
        | Term 
 | Definition 
 | 
        |  | 
        
        | Term 
 | Definition 
 
        | first 2 weeks of development |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | 2nd week-8th week of development |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | last 30 weeks of development |  | 
        |  | 
        
        | Term 
 
        | clinical/medical developmental events |  | Definition 
 
        | date since last menstrual period |  | 
        |  | 
        
        | Term 
 
        | embryologist developmental event date |  | Definition 
 | 
        |  | 
        
        | Term 
 | Definition 
 
        | outer layer of secondary oocyte |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | receptor that binds sperm acrosomal region |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | binding of acrosome to ZP3 |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | receptor on 2* oocyte plasma membrane causing depolarization of membrane |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | membrane depolarization mechanism block |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | intracellular calcium release during fertilization (block) |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | female gamete which has undergone 2nd meiotic division |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | male gamete which has undergone 2nd meiotic division |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | fusion of sperm and egg makes a ___ |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | 12 or more cell stage of embryonic development |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | fluid-filled ball of multipotent cells |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | collection of blastocyst cells which become the embryo |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | collection of blastocyst cells which become extra-embryonic cells |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | inner fluid filled cavity of blastocyst |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | two oocytes fertilized by two different sperms |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | single oocyte fertilized by one sperm; zygote splits to form _____ |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | structure which exchanges nutrients and removes waste in the developing fetus |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | multinucleted cells; invade mother's uterine endometrial wall by digestion |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | type of trophoblast which remains close to the embryonic tissue, barrier between maternal and embryonic blood |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | trophoblast structure surrounding syncytio. and lacunae |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | cytotrophoblasts become ____ |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | carries oxygenated blood to the embryo |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | carries deoxygenated blood to the embryo |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | thin layer of syncytio. and basement membrane providing gas exchange to developing embryo |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | small pools formed by the syncytio. containing maternal blood |  | 
        |  | 
        
        | Term 
 | Definition 
 | 
        |  | 
        
        | Term 
 | Definition 
 
        | structure which eventually forms the 3 germ layers |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | structure which forms extraembryonic membranes |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | cavity inside ICM surrounded by amneotic sac; fluid filled + protects embryo |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | surrounds the amniotic cavity inside the ICM |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | sac inside blastocele formed from hypoblast |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | differentiation of epiblast into 3 germ layers |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | rod structure between mesoderm and endoderm near primitive streak causing induction of ectoderm, folding of neural plate |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | thickened area of epiblast cells formed during gastrulation |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | inner layer containing digestive tract |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | middle layer containing muscle, bone, blood |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | outer layer containing skin and neural system |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | structure made from ectoderm induced by the notochord during gastrulation |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | raised edges of the neural plate during neural tube formation |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | neural tube cells which break away to become nerves and ganglia, skull |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | closed tube which forms basis of the CNS in embryological development |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | derived from mesoderm next to neural tube, become part of skull + spinal column |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | cephalic end of yolk sac folds into the ___ |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | caudal end of yolk sac folds into the ____ |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | region of yolk sac moving towards connecting stalk, becoes bladder |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | caudal indentation close to hindgut region |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | cephalic indentation close to foregut region |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | mesodermal region which becomes the three body cavity membranes, runs entire length of body |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | evaginations of two arches which become auditory tube, thyroid, etc |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | thickened ectodermal region which becomes the limbs, stimulated by limb buds |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | region which stimulate apical ectodermal ridge formation |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | embryonic structure which becomes the forehead and nose |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | embryonic structure which becomes the jaw |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | embryonic structure which becomes the mandible |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | structure which forms the nasal cavity and palate |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | early muscle progenitor cells |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | small blood structures on surface of yolk sac and inside the embryo |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | primitive heart tube dilation which becomes major veins (ie vena cava) |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | primitive heart tube dilation which becomes major arteries |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | hole between interatrial septum which allows direct flow from RA to LA |  | 
        |  | 
        
        | Term 
 | Definition 
 | 
        |  | 
        
        | Term 
 | Definition 
 
        | muscular structure between the ventricles |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | evagination of the trachea formed from the foregut, become the lungs |  | 
        |  |