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The thoracic spinal nerve 12 (T12) is a spinal nerve of the thoracic segment. [1] It originates from the spinal column from below the thoracic vertebra 12 (T12). It may also be known as the subcostal nerve.
Scott-Charlton, W.and Roebuck, D.J. The Significance of Posterior Primary Divisions of Spinal Nerves in Pain Syndrome. The Medical Journal of Australia. 1972; 2:945–948. Maigne, R. Low back pain of thoracolumbar origin (T11-T12-L1). In: Maigne, R., Second Edition: Diagnosis and Treatment of Pain of Vertebral Origin.
The subcostal nerve (anterior division of the twelfth thoracic nerve [1]) is a mixed motor and sensory nerve contributing to the lumbar plexus. It runs along the lower border of the twelfth rib , often gives a communicating branch to the first lumbar nerve , and passes under the lateral lumbocostal arch .
Spinal nerve Typical spinal nerve location. Each spinal nerve is a mixed nerve, formed from the combination of nerve root fibers from its dorsal and ventral roots. The dorsal root is the afferent sensory root and carries sensory information to the brain. The ventral root is the efferent motor root and carries motor information from the brain.
The intervertebral foramen is small, and circular, with two at each intervertebral level, one for the right and one for the left exiting nerve roots. The vertebral foramen is the large opening posterior to the vertebral body also known as the spinal canal. It contains and protects the spinal cord at the thoracic level.
Some referred pain due to visceral sensations refer to dermatomes that send fibers to the same level of spinal cord. A dermatome is an area of skin supplied by sensory neurons that arise from a spinal nerve ganglion. Symptoms that follow a dermatome (e.g. like pain or a rash) may indicate a pathology that involves the related nerve root ...
The lumbar plexus is a web of nerves (a nerve plexus) in the lumbar region of the body which forms part of the larger lumbosacral plexus.It is formed by the divisions of the first four lumbar nerves (L1-L4) and from contributions of the subcostal nerve (T12), which is the last thoracic nerve.
The intercostal nerves are part of the somatic nervous system, and arise from the anterior rami of the thoracic spinal nerves from T1 to T11. [1] [2] The intercostal nerves are distributed chiefly to the thoracic pleura and abdominal peritoneum, and differ from the anterior rami of the other spinal nerves in that each pursues an independent course without plexus formation.
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