Your spinal nerves help to relay sensory, motor, and autonomic information between the rest of your body and your central nervous system CNS. Why are dermatomes important? How many are there? And where can they be found? Continue reading as we answer these questions and more. Each of your dermatomes is supplied by a single spinal nerve.
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Your spinal nerves help to relay sensory, motor, and autonomic information between the rest of your body and your central nervous system CNS. Why are dermatomes important? How many are there? And where can they be found?
Continue reading as we answer these questions and more. Each of your dermatomes is supplied by a single spinal nerve. Your spinal nerves Spinal nerves are part of your peripheral nervous system PNS. You have 31 pairs of spinal nerves. They form from nerve roots that branch from your spinal cord. The five groups of spinal nerves are: Cervical nerves. There are eight pairs of these cervical nerves , numbered C1 through C8. They originate from your neck.
Thoracic nerves. You have 12 pairs of thoracic nerves that are numbered T1 through T They originate in the part of your spine that makes up your torso. Lumbar nerves. There are five pairs of lumbar spinal nerves, designated L1 through L5.
They come from the part of your spine that makes up your lower back. Sacral nerves. Like the lumbar spinal nerves, you also have five pairs of sacral spinal nerves. Coccygeal nerves. You only have a single pair of coccygeal spinal nerves. This pair of nerves originates from the area of your coccyx , or tailbone. Your dermatomes Each of your dermatomes is associated with a single spinal nerve.
These nerves transmit sensations, such as pain, from a specific area of your skin to your CNS. Your body has 30 dermatomes. You may have noticed that this is one less than the number of spinal nerves.
As a result, dermatomes begin with spinal nerve C2. Dermatomes have a segmented distribution throughout your body. The exact dermatome pattern can actually vary from person to person. Some overlap between neighboring dermatomes may also occur. Because your spinal nerves exit your spine laterally, dermatomes associated with your torso and core are distributed horizontally. When viewed on a body map, they appear very much like stacked discs.
The dermatome pattern in the limbs is slightly different. This is due to the shape of the limbs as compared with the rest of the body. In general, dermatomes associated with your limbs run vertically along the long axis of the limbs, such as down your leg. Where is each dermatome located? Your dermatomes are numbered based on which spinal nerve they correspond to. Remember that the exact area that a dermatome may cover can vary by individual.
Some overlap is also possible. As such, consider the outline below to be a general guide. Cervical spinal nerves C2: lower jaw, back of the head C3: upper neck, back of the head C4: lower neck, upper shoulders C5: area of the collarbones, upper shoulders C6: shoulders, outside of arm, thumb C7: upper back, back of arm, pointer and middle finger C8: upper back, inside of arm, ring and little finger Thoracic spinal nerves T1: upper chest and back, armpit, front of arm T2: upper chest and back T3: upper chest and back T4: upper chest area of nipples and back T5: mid-chest and back.
DERMATOMES AND MYOTOMES PDF
Neurological Examination Dermatomes Each of the spinal nerves exits the spinal canal between two of the vertebra. Each then goes to a particular area of the body. The area of skin served by each of these nerves is called its dermatome. The nerves from the upper cervical spine serve the skin of the neck.
The 30 Dermatomes Explained and Located
The nerves of the brachial plexus are shown in figure 2. When an encroachment occurs to a spinal nerve, the corresponding dermatome may exhibit the symptoms. The list below details nerve roots and the approximate area of skin that they provide innervation to: Each of these nerves relays sensation including pain from a particular region of skin to the brain. As an example, the flexion of the elbow is innervated by the musculocutaneous nerve. The dermatomes of the thorax and abdomen are evenly spaced segments. The list below details nerve roots and the approximate area of skin that they provide innervation to:.
Myotomes, Spinal Nerve Roots, and Dermatomes
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