stratum spinosum
a layer of the epidermis that provides strength and flexibility to the skin
The stratum spinosum is a layer of the epidermis, which is the outermost layer of the skin. It is located just above the stratum basale and below the stratum granulosum.
The cells in the stratum spinosum are known as spinous or prickle cells because they appear to have spines or prickles when viewed under a microscope. These projections are actually desmosomes, which are structures that help to hold adjacent epithelial cells together.
The stratum spinosum contains several layers of these spinous cells that are connected by desmosomes. These cells also contain keratin Intermediate filaments that provide strength and structure to the skin.
In addition, the stratum spinosum contains dendritic cells, which are specialized immune cells that play a key role in protecting the body from pathogens and foreign invaders. These cells are able to recognize and engulf foreign particles and present them to other cells in the immune system for destruction.
Overall, the stratum spinosum is important for maintaining the strength and integrity of the skin, as well as for protecting the body from harmful substances.
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