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  2. Mesenchyme - Wikipedia

    en.wikipedia.org/wiki/Mesenchyme

    Mesenchyme (/ ˈ m ɛ s ə n k aɪ m ˈ m iː z ən-/ [1]) is a type of loosely organized animal embryonic connective tissue of undifferentiated cells that give rise to most tissues, such as skin, blood or bone. [2] [3] The interactions between mesenchyme and epithelium help to form nearly every organ in the developing embryo. [4]

  3. Septum transversum - Wikipedia

    en.wikipedia.org/wiki/Septum_transversum

    The septum transversum originally arises as the most cranial part of the mesenchyme on day 22. [1] During craniocaudal folding, it assumes a position cranial to the developing heart at the level of the cervical vertebrae. [1]

  4. Limb development - Wikipedia

    en.wikipedia.org/wiki/Limb_development

    The digits also have a quasi-periodic arrangement along the proximodistal axis, consisting of tandem chains of skeletal elements. The generation of the basic limb plan during development results from the patterning of the mesenchyme by an interplay of factors that promote precartilage condensation and factors that inhibit it. [13]

  5. Neural crest - Wikipedia

    en.wikipedia.org/wiki/Neural_crest

    The neural crest is a ridge-like structure that is formed transiently between the epidermal ectoderm and neural plate during vertebrate development. Neural crest cells originate from this structure through the epithelial-mesenchymal transition, and in turn give rise to a diverse cell lineage—including melanocytes, craniofacial cartilage and bone, smooth muscle, dentin, peripheral and enteric ...

  6. Epithelial–mesenchymal transition - Wikipedia

    en.wikipedia.org/wiki/Epithelial–mesenchymal...

    EMT takes place during the construction of the vertebral column out of the extracellular matrix, which is to be synthesized by fibroblasts and osteoblasts that encircle the neural tube. The major source of these cells are sclerotome and somite mesenchyme as well as primitive streak. Mesenchymal morphology allows the cells to travel to specific ...

  7. Zone of polarizing activity - Wikipedia

    en.wikipedia.org/wiki/Zone_of_polarizing_activity

    The zone of polarizing activity (ZPA) is an area of mesenchyme that contains signals which instruct the developing limb bud to form along the anterior/posterior axis. Limb bud is undifferentiated mesenchyme enclosed by an ectoderm covering. Eventually, the limb bud develops into bones, tendons, muscles and joints.

  8. Ossification - Wikipedia

    en.wikipedia.org/wiki/Ossification

    Most other bones (e.g. vertebrae) also have primary ossification centers, and bone is laid down in a similar manner. Secondary centers. The secondary centers generally appear at the epiphysis. Secondary ossification mostly occurs after birth (except for distal femur and proximal tibia which occurs during 9th month of fetal development).

  9. List of human cell types derived from the germ layers

    en.wikipedia.org/wiki/List_of_human_cell_types...

    This page was last edited on 30 December 2024, at 15:41 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.