Are melanocytes neural crest derivatives?
The melanocyte lineage is derived from the neural crest, which has its origins in the neural tube. Following its formation, neural crest cells delaminate from the dorsal-most aspect of the neural tube by a process of epithelial-to-mesenchymal transition.
Are melanocytes differentiated?
Melanin is synthesized in melanocytes and accumulates in special organelles, melanosomes, which upon maturation are transferred to keratinocytes. Melanocytes differentiate from undifferentiated precursors, called melanoblasts, which are derived from neural crest cells.
What can neural crest cells differentiate into?
The cranial (cephalic) neural crest, whose cells migrate dorsolaterally to produce the craniofacial mesenchyme that differentiates into the cartilage, bone, cranial neurons, glia, and connective tissues of the face.
How are melanocytes specialized?
Melanocytes produce the protective skin-darkening pigment melanin. melanocyte, specialized skin cell that produces the protective skin-darkening pigment melanin.
What are neural crest cells?
Neural crest cells (NCCs) are a multipotent and migratory cell population in the developing embryo that contribute to the formation of a wide range of tissues. Defects in the development, differentiation and migration of NCCs give rise to a class of syndromes and diseases that are known as neurocristopathies.
Where are neural crest stem cells found?
Introduction. The neural crest (NC) is a population of cells that was first described by the Swiss embryologist Wilheim His in 1868 as a “Zwischenstrang” (the intermediate strand) due to their location between the dorsal ectoderm and the neural tube in vertebrate embryos.
Where are the melanocytes?
A cell in the skin and eyes that produces and contains the pigment called melanin. Anatomy of the skin, showing the epidermis, dermis, and subcutaneous tissue. Melanocytes are in the layer of basal cells at the deepest part of the epidermis.
How are neural crest cells specified?
After gastrulation, neural crest cells are specified at the border of the neural plate and the non-neural ectoderm. During neurulation, the borders of the neural plate, also known as the neural folds, converge at the dorsal midline to form the neural tube.
How is neural crest different from endoderm mesoderm and ectoderm?
Ectoderm and endoderm are primary germ layers: Mesoderm is a secondary germ layer formed after inductive interactions between ectoderm and endoderm. Like mesoderm, the neural crest arises early in development and gives rise to divergent cell and tissue types.
What are the melanocytes?
(meh-LAN-oh-site) A cell in the skin and eyes that produces and contains the pigment called melanin. Enlarge. Anatomy of the skin, showing the epidermis, dermis, and subcutaneous tissue. Melanocytes are in the layer of basal cells at the deepest part of the epidermis.