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A dermatome is an area of skin that is mainly supplied by afferent nerve fibres from the dorsal root of any given spinal nerve. [ 1 ] [ 2 ] There are 8 cervical nerves (C1 being an exception with no dermatome), 12 thoracic nerves , 5 lumbar nerves and 5 sacral nerves .
English: A diagram showing human dermatomes, i.e., skin regions with respect to the routing of their afferent nerves through the spinal cord. Svenska: Människans dermatom, sensoriska zonindelning. Date
English: A diagram showing human dermatomes, i.e., skin regions with respect to the routing of their afferent nerves through the spinal cord. Svenska: Människans dermatom, sensoriska zonindelning. Date
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The peripheral nervous system (PNS) is divided into the somatic nervous system, the autonomic nervous system, and the enteric nervous system.However, it is the somatic nervous system, responsible for body movement and the reception of external stimuli, which allows one to understand how cutaneous innervation is made possible by the action of specific sensory fibers located on the skin, as well ...
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Lumboinguinal nerve (green) and Ilioinguinal nerve (purple). In modern texts, these two regions are often considered to be innervated by the genitofemoral nerve.; Medial cluneal nerves (pink) - labeled as "post. division of sacral"
Modern texts are in agreement about which areas of the skin are served by which cutaneous nerves, but there are minor variations in some of the details. The borders designated by the diagrams in the 1918 edition of Gray's Anatomy, provided below, are similar but not identical to those generally accepted today.