Docstoc

Cell Lineage

Document Sample
Cell Lineage Powered By Docstoc
					                                                                                Cell Lineage from Embryoblast

                                                                                          embryoblast


                                                                                                                                                        Hypoblast (primary endoderm)
                                                      epiblast

                                                                                                              Heuser’s membrane (exocoelomic membrane)          Some extraembryonic
                                                      Primitive streak                                                                                          reticulum
                                                      delves inward
         amnioblasts                                                                                                     Exocoelomic vesicles
                                                                                                                         (exocoelomic cysts)
                                                      Intraembryonic
Amniotic membrane                                     mesoderm                                        ectoderm

                                                                                                                                                Additional Notes:
  Definitive endoderm                                                                       Neural plate                 Epidermis of skin         1. Embryoblast comes from
  (entoderm)                      Notochordal           Prechordal         Caudal           (neuroepithelium,
                                  process               plate              eminence                                                                    blastomeres. Blastomeres also
                                                                                            neuroectoderm)
                                                                                                                                                       form the trophoblast.
                                                                                                                                                   2. Trophoblasts become either
Linings of gut,                                                                                                                                        syncytiotrophoblast (STB) or
respiratory system, liver,        Notochordal                                                             Neural folds                                 cytotrophoblast (CTB).
and pancreas                      plate
                                                                                                                                                   3. Extraembryonic mesoderm is
                                                                                                                                                       of questionable origin.
                                                                                               Neural tube        Neural crest cells
                                                                                                                                                   4. Ectoderm and endoderm fuse
    notochord                Paraxial           Intermediate           Lateral plate                                                                   to form buccopharyngeal (aka
                             mesoderm           mesoderm               mesoderm                                                                        oropharyngeal) membrane
                                                                                            Caudal              Neurons whose cell
                                                                                            neural tube         bodies are in PNS,                     (eventually the oral cavity) and
    Nucleus                                                                                                                                            the cloacal membrane (anus
                                            Urinary       Some                                                  dorsal root and chain
    pulposus                                                                                                    ganglia, etc.                          and urogenital tract).
                                            system        genital
                                                                               Somatopleuric                                                       5. Stem villi are combinations of
                                                                               mesoderm                                                                structures. Primary villi have
                                                                                                      Neural cord
                                        Splanchnopleuric mesoderm                                                                                      CTB & STB. Secondary villi
somitomeres                                                                                                                                            have CTB, STB, &
                                                                               Inner lining of body
                  somites               Mesothelium of gut tube                wall, parts of limbs, most       Brain &                                extraembryonic mesoderm.
1-7 =                                                                                                           spinal cord                            Tertiary villi are the same as
                                                                               dermis, CT around
pharynge                                                                                                                                               secondary, except that the
                sclerotomes         dermamyotomes                              muscles
al arches;                                                                                                                                             extraembryonic mesoderm has
skeletal
                vertebrae       Annulus         dermatome            myotome
                                                                                                                                                       differentiated into blood
muscle
of face,                        fibrosus                                                                    Limb muscles                               vessels.
                                                                                        hypomere
jaw, and                                      Some dermis            epimere
throat                                        of neck, back,                                                      Intercostals muscles, abs
                                                                       Erector spinae, transversospinalis
                                              & trunk

				
DOCUMENT INFO
Shared By:
Categories:
Tags:
Stats:
views:16
posted:11/13/2011
language:English
pages:1