Term
|
Definition
|
|
Term
|
Definition
| ectoderm, mesoderm, endoderm |
|
|
Term
|
Definition
| --> epidermis, CNS, PNS, retina, etc. |
|
|
Term
|
Definition
| ---> smooth muscle, connective tissue (blood, bone, bone marrow, striated muscle), vessels, CV system, reproductive system, excretory organs |
|
|
Term
|
Definition
| ---> epthelial linings of GI/respiratory tracts, glandular cells (liver, pancreas, GI tract) |
|
|
Term
|
Definition
| thickened linear band of epiblast arising early 3rd week; appears caudally, develops caudally, then rostrally; forms mesoderm and endoderm layers |
|
|
Term
|
Definition
| proliferation of epiblastic cells at the cranial end; contains primitive pit |
|
|
Term
|
Definition
| narrow groove that forms in primitive streak resulting from invagination of epiblastic cells |
|
|
Term
|
Definition
| develops after appearance of primitive streak; epiblastic cells of deep surface that migrate; tissue consists of loosely arranged cells in gelatinous matrix |
|
|
Term
|
Definition
| ameboid, actively phagocytic cells forming mesenchyme; proliferate and differentiate widely |
|
|
Term
|
Definition
| forms from some mesenchymal cells; undifferentiated mesoderm, also embryonic mesoderm |
|
|
Term
|
Definition
| germ layer in the roof of yolk sac formed from epiblastic cells that displace hypoblastic cells |
|
|
Term
|
Definition
| cells remaining in epiblast after differentiation of 2 other germ cell layers |
|
|
Term
|
Definition
| median cellular cord of mesenchymal cells migrating cranially ---> notochordal canal |
|
|
Term
|
Definition
| notochordal process + lumen; grows cranially between endoderm/ectoderm until prechordal plate |
|
|
Term
|
Definition
| fate of prechordal plate; future site of oral cavity |
|
|
Term
|
Definition
| mesenchymal cells migrate around the prechordal plate and meet to form cardiogenic mesoderm; forms heart primordium late 3rd week |
|
|
Term
|
Definition
| caudal to primitive streak; future sitw of anus |
|
|
Term
|
Definition
| cellular rod developing from transformation of notochordal process; defines axis, basis for axial skeletal development, primary inducer of neuroectoderm, lends rigidity in absence of spinal cord |
|
|
Term
|
Definition
| thickening embryonic ectoderm induced by notochord to form neuroectoderm; primordium of CNS |
|
|
Term
|
Definition
| outpouching of yolk sac extending into connecting stalk w/ respiratory, urine storage functions, later assoc. w/ urinary bladder |
|
|
Term
|
Definition
| formation of neural tube; completed 4th week |
|
|
Term
|
Definition
| openings at rostral and caudal ends of fusing neural tube; close by end of 4th week (hopefully) |
|
|
Term
|
Definition
| invagination of the neural plate along the longitudinal median |
|
|
Term
|
Definition
| raised areas of neural plate bilateral to neural groove; first signs of brain development |
|
|
Term
|
Definition
| tube developed as neural folds fuse together |
|
|
Term
|
Definition
| neuroectodermal cells at folds that lose epithelial affinities and migrate dorsolaterally to neural tube; form neural crests |
|
|
Term
|
Definition
| flattened irregular mass of neural crest cells; give rise to sensory ganglia, ANS ganglia, meninges, pigment cells, etc. |
|
|
Term
|
Definition
| congenital abnormalities may arise from incomplete fusion of neural folds |
|
|
Term
|
Definition
| columns of embryonic mesoderm on each side of notochord; @ late 3rd week differentiates into somites |
|
|
Term
|
Definition
| blocks of mesoderm on each side of developing neural tube; develop craniocaudally, give rise to most of axial skeleton + assoc muscles + adj. dermis |
|
|
Term
|
Definition
| = embryonic body cavity; later divided into pericardial, pleural, and peritoneal cavities |
|
|
Term
|
Definition
|
|
Term
|
Definition
| forms embryonic gut or splanchnopleure |
|
|
Term
| vasculogenesis and angiogenesis |
|
Definition
| development of blood vessel |
|
|
Term
|
Definition
| mesenchymal cells that differentiate into vessel-forming cells; aggregate to form blood islands |
|
|
Term
|
Definition
| isolated angiogenic cell clusters |
|
|
Term
|
Definition
| endothelial cells of early vessels on allantois and yolk sac that form blood cells |
|
|
Term
|
Definition
| paired longitudinal endothelial-lined channels that have fused to form primordial heart tube; 3rd week |
|
|
Term
| 1st organ system to reach function state? |
|
Definition
| cardiovascular system; 5th week |
|
|
Term
| secondary chorionic villi |
|
Definition
| protrusions of syncytio- and cytotrophoblastic cells that now contain mesenchyme |
|
|
Term
|
Definition
| protrusions of syncytio- and cytotrophoblast containing mesenchyme and capillaries; connects embryonic cardiovascular system w/ maternal |
|
|
Term
|
Definition
| cytotrophoblastic cells that have proliferated through syncytiotrophoblast to surround chorionic sac; anchors to endometrium |
|
|
Term
|
Definition
|
|
