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Dermatomes are areas of skin that send signals to the brain through the spinal nerves. These signals give rise to sensations involving temperature, pressure, and pain. The part of a nerve that exits the spinal cord is called the nerve root. Damage to a nerve root can trigger symptoms in the nerve’s corresponding dermatome.What is the purpose of dermatomes?
“dermatome,” or “dermatome” refers to a tissue that covers the spine. Dermatomes are important in allowing doctors to construct maps of the spinal cord, which aid in the diagnosis. Two major maps are recognized by medical experts.What are the components of dermatomes?
A dermatome is an area of skin that is mainly supplied by afferent nerve fibres from the dorsal root of any given spinal nerve.   There are 8 cervical nerves (C1 being an exception with no dermatome), 12 thoracic nerves , 5 lumbar nerves and 5 sacral nerves .How is the skin divided into dermatomes?
It is an area of skin which is innervated by the posterior (dorsal) root of a single spinal nerve. As posterior roots are organized in segments, dermatomes are as well. This is why the term “dermatome” refers to the segmental innervation of the skin.