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The apical ectodermal ridge (AER) is a structure that forms from the ectodermal cells at the distal end of each limb bud and acts as a major signaling center to ensure proper development of a limb. After the limb bud induces AER formation, the AER and limb mesenchyme —including the zone of polarizing activity (ZPA)—continue to communicate ...
Corneocytes are terminally differentiated keratinocytes and compose most of the stratum corneum, the outermost layer of the epidermis.They are regularly replaced through desquamation and renewal from lower epidermal layers and are essential for its function as a skin barrier.
Snakes are a particularly good example for studying limb loss, as they underwent limb loss and regeneration multiple times throughout their evolution before they finally lost their legs for good. Much of the gene expression during embryonic development is regulated via spatiotemporal and chemotactic signaling, [ 20 ] as depicted by the image to ...
A palm print is an image acquired of the palm region of the hand. It can be either an online image (i.e. taken by a scanner or CCD) or offline image where the image is taken with ink and paper. [1] The palm itself consists of principal lines, wrinkles (secondary lines), and epidermal ridges.
Sampling of human stratum corneum using a tape-stripping method [1]. The stratum corneum (Latin for 'horned layer') is the outermost layer of the epidermis.Consisting of dead tissue, it protects underlying tissue from infection, dehydration, chemicals and mechanical stress.
The epidermis is the outermost of the three layers that comprise the skin, the inner layers being the dermis and hypodermis. [1] The epidermal layer provides a barrier to infection from environmental pathogens [2] and regulates the amount of water released from the body into the atmosphere through transepidermal water loss.
Retrieved from "https://en.wikipedia.org/w/index.php?title=Epidermal_ridges&oldid=756405634"This page was last edited on 24 December 2016, at 01:01 (UTC). (UTC).
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 ...