Thoracic spinal nerves
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There are thirteen pairs of dorsal spinal nerves and their arrangements are almost similar.
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The dorsal branches pass up into the intertransverse space and divide into medial and lateral branches of which the former supply the spinal muscles and skin of the region.
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The lateral branches are directed upward, pass through the longissimus dorsi and appear between it and the transversalis costarum. They break off into filaments to supply the skin.
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The ventral branches are the intercostal nerves. The first and second dorsal enter into the formation of the brachial plexus.
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The ventral branches of the rest are much larger than the dorsal branches and descend into the intercostal spaces in company with the vessels.
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At the upper half they run in between the intercostal muscles and supplies it.
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About the middle they comes out of the muscle as perforating branch supply the cutaneous muscle and skin of the thorax and abdomen.
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The intercostal nerves from the eighth to the thirteenth supply sensory branches to the diaphragm.
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Last modified: Sunday, 16 October 2011, 7:45 AM