<P> In addition to the problems found in lower - level injuries, thoracic (chest height) spinal lesions can affect the muscles in the trunk . Injuries at the level of T1 to T8 result in inability to control the abdominal muscles . Trunk stability may be affected; even more so in higher level injuries . The lower the level of injury, the less extensive its effects . Injuries from T9 to T12 result in partial loss of trunk and abdominal muscle control . Thoracic spinal injuries result in paraplegia, but function of the hands, arms, and neck are not affected . </P> <P> One condition that occurs typically in lesions above the T6 level is autonomic dysreflexia (AD), in which the blood pressure increases to dangerous levels, high enough to cause potentially deadly stroke . It results from an overreaction of the system to a stimulus such as pain below the level of injury, because inhibitory signals from the brain cannot pass the lesion to dampen the excitatory sympathetic nervous system response . Signs and symptoms of AD include anxiety, headache, nausea, ringing in the ears, blurred vision, flushed skin, and nasal congestion . It can occur shortly after the injury or not until years later . </P> <P> Other autonomic functions may also be disrupted . For example, problems with body temperature regulation mostly occur in injuries at T8 and above . Another serious complication that can result from lesions above T6 is neurogenic shock, which results from an interruption in output from the sympathetic nervous system responsible for maintaining muscle tone in the blood vessels . Without the sympathetic input, the vessels relax and dilate . Neurogenic shock presents with dangerously low blood pressure, low heart rate, and blood pooling in the limbs--which results in insufficient blood flow to the spinal cord and potentially further damage to it . </P> <P> Spinal cord injuries at the cervical (neck) level result in full or partial tetraplegia (also called quadriplegia). Depending on the specific location and severity of trauma, limited function may be retained . </P>

Where does loss of function occur in a spinal cord injury