At each vertebral level is a pair of spinal nerves,each consisting of an anterior and a posterior root.Select the statement that represents true information about motor or sensory distribution.

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The posterior,or sensory,root contains cell bodies that lie in the spinal ganglia located in the intervertebral foramina,the opening through which the nerves exit from the spinal canal and emerge from the cord.The course of the cervical nerves is horizontal,but at each lower level they assume an increasingly oblique and downward direction.In the lumbar region,the course of the nerves is nearly vertical,forming the cauda equina.The normal segmental sensory distribution is valuable in the anatomic localization of sensory disorders.Dermatomes are bands of skin innervated by a sensory root of a single spinal nerve.

At Each Vertebral Level Is a Pair of Spinal Nerves,each