Spinal Nerves Thirty-one pairs of spinal nerves originate from the spinal cord. They are all mixed nerves, and they provide a two-way communication system between the spinal cord and parts of the arms, legs, neck and trunk of the body. Although spinal nerves do not have individual names, they are grouped according to the level from which they stem, and each nerve is numbered in sequence. Hence, there are eight pairs of "cervical nerves" (numbered C1 - C8), twelve pairs of "thoracic nerves" (T1 - T12), five pairs of "lumbar nerves" (L1 - L5), five pairs of "sacral nerves" (S1 - S5), and one pair of "coccygeal nerves". The nerves coming from the upper part of the spinal cord pass outward nearly horizontally, while those from the lower regions descend at sharp angles. This is derived from the consequence of growth. In early life, the spinal cord extends the entire length of the vertebral column, but with age, the column grows faster than the cord. As a
This is the end of the preview. Sign up
access the rest of the document.
This note was uploaded on 11/22/2011 for the course BSC BSC1085 taught by Professor Sharonsimpson during the Fall '10 term at Broward College.